View Filing Data

Interest and other income, net

$ 39,540

$ 27,447

$ 22,702

129

214

273

Gain on investment in M-I SWACO

1,270

Cost of revenue

Research & engineering

1,073

919

802

General & administrative

427

311

261

Merger & integration

115

164

Restructuring & other

331

238

Interest

298

207

221

Income from continuing operations before taxes

6,338

5,156

3,934

Taxes on income

1,545

890

770

Income (loss) from discontinued Operations

4,793

4,266

3,164

220

(22)

Net income (loss) attributable to noncontrolling interests

5,013

4,266

3,142

(1)

Net Income attributable to Schlumberger

4,997

4,267

3,134

Schlumberger amounts attributable to:

Income (loss) from discontinued Operations

4,777

4,267

3,156

220

(22)

Basic earnings per share of Schlumberger:

$ 4,997

$ 4,267

$ 3,134

Income (loss) from discontinued operations

$ 3.54

$ 3.41

$ 2.63

0.16

(0.02)

Diluted earnings per share of Schlumberger:

^[1]

3.70

3.41

2.62

Income (loss) from discontinued operations

3.51

3.38

2.61

0.16

(0.02)

Oilfield Services [Member]

$ 3.67

$ 3.38

$ 2.59

Average shares outstanding:

Basic

1,349

1,250

1,198

Assuming dilution

1,361

1,263

1,214

Revenue

$ 36,959

$ 26,673

$ 22,702

Cost of revenue

Cost of revenue

28,940

21,098

$ 17,519

Distribution [Member]

Revenue

Cash flows from operating activities:

2,581

774

Cost of revenue

Cost of revenue

$ 2,478

$ 745

[1]	Amounts may not add due to rounding.

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 5,013	$ 4,266	$ 3,142
Currency translation adjustments
Unrealized net change arising during the period	(82)	(26)	18
Derivatives
Net derivatives (loss) gain on hedge transactions	(79)	(269)	223
Reclassification to net income of net realized (loss) gain	8	274	(80)
Actuarial loss
Actuarial loss arising during the period	(1,008)	(117)	(237)
Amortization to net income of net actuarial loss	121	90	32
Prior service cost
Prior service cost (gain) arising during the period	1	(162)	27
Curtailment			96
Amortization to net income of net prior service cost	133	96	97
Income taxes on pension and other postretirement benefit plans	117	20	52
Comprehensive income	4,224	4,172	3,370
Comprehensive income (loss) attributable to noncontrolling interests	16	(1)	9
Comprehensive income attributable to Schlumberger	$ 4,208	$ 4,173	$ 3,361

CONSOLIDATED BALANCE SHEET - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash	$ 1,705	$ 1,764
Short-term investments	3,122	3,226
Receivables less allowance for doubtful accounts (2011 - $177; 2010 - $185)	9,500	8,278
Inventories	4,700	3,804
Deferred taxes	456	51
Other current assets	1,056	975
Current Assets Total	20,539	18,098
Fixed Income Investments, held to maturity	256	484
Investments in Affiliated Companies	1,266	1,071
Fixed Assets Less Accumulated Depreciation	12,993	12,071
Multiclient Seismic Data	425	394
Goodwill	14,154	13,952
Intangible Assets	4,882	5,162
Other Assets	686	535
Total Assets	55,201	51,767
Current Liabilities
Accounts payable and accrued liabilities	7,579	6,488
Estimated liability for taxes on income	1,245	1,493
Long-term debt - current portion	1,041	2,214
Short-term borrowings	336	381
Dividends payable	337	289
Current Liabilities Total	10,538	10,865
Long-term Debt	8,556	5,517
Postretirement Benefits	1,732	1,262
Deferred Taxes	1,731	1,636
Other Liabilities	1,252	1,043
Total Liabilities	23,809	20,323
Equity
Common stock	11,639	11,920
Treasury stock	(5,679)	(3,136)
Retained earnings	28,860	25,210
Accumulated other comprehensive loss	(3,557)	(2,768)
Schlumberger stockholders' equity	31,263	31,226
Noncontrolling interests	129	218
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total	31,392	31,444
Liabilities and stockholders' equity, Total	$ 55,201	$ 51,767

CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
CONSOLIDATED BALANCE SHEET [Abstract]
Allowance for doubtful accounts on receivable	$ 177	$ 185	$ 160	$ 133

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

(Income) loss from discontinued operations

$ 5,013

$ 4,266

$ 3,142

(220)

Adjustments to reconcile net income to net cash provided by operating activities:

Depreciation and Amortization

^[1]

3,281

2,759

2,476

Gain on investment in M-I SWACO

(1,270)

Earnings of companies carried at equity, less dividends received

(64)

(85)

(103)

Deferred income taxes

(35)

(109)

373

Share-based Compensation

272

198

186

Pension and other postretirement benefits expense

365

299

306

Pension and other postretirement benefits curtailment charge

136

Other non-cash items

203

327

162

Pension and other postretirement benefits funding

(601)

(868)

(1,149)

Change in operating assets and liabilities:

(Increase) decrease in receivables

^[2]

(1,310)

(289)

155

(Increase) decrease in inventories

^[2]

(991)

(67)

(Increase) decrease in other current assets

^[2]

(99)

136

Increase (decrease) in accounts payable and accrued liabilities

^[2]

708

(103)

(293)

(Decrease) increase in estimated liability for taxes on income

^[2]

(544)

480

(361)

(Decrease) increase in other liabilities

^[2]

168

(89)

Other-net

^[2]

(91)

143

NET CASH PROVIDED BY OPERATING ACTIVITIES

6,169

5,494

5,311

Cash flows from investing activities:

Multiclient seismic data capitalized

(4,016)

(2,914)

(2,395)

(289)

(326)

(230)

Cash acquired in merger with Smith International, Inc.

399

Acquisition of Geoservices, net of cash acquired

(889)

Other business acquisitions and investments, net of cash acquired

(186)

(212)

(514)

Sale (purchase) of investments, net

351

1,023

(1,159)

Other

230

(19)

228

NET CASH USED IN INVESTING ACTIVITIES

(3,910)

(2,938)

(4,070)

Cash flows from financing activities:

Dividends paid

(1,300)

(1,040)

(1,006)

Proceeds from employee stock purchase plan

208

179

Proceeds from exercise of stock options

230

222

110

Tax benefit on stock options

Stock repurchase program

(2,998)

(1,717)

(500)

Proceeds from issuance of long-term debt

6,884

2,815

1,973

Repayment of long-term debt

(4,992)

(1,814)

(1,754)

Net decrease in short-term borrowings

(119)

(68)

(111)

Other

(628)

NET CASH USED IN FINANCING ACTIVITIES

(2,700)

(1,409)

(1,188)

Cash flow from discontinued operations - operating activities

(45)

Cash flows from discontinued operations - investing activities

385

Cash flow from discontinued operations

385

(45)

Net (decrease) increase in cash before translation effect

(56)

1,147

Translation effect on cash

(3)

Cash, beginning of period

1,764

617

609

Cash, end of period

$ 1,705

$ 1,764

$ 617

[1]	Includes multiclient seismic data costs.
[2]	Net of the effect of business acquisitions.

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock Issued	Common Stock In Treasury	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning Balance at Dec. 31, 2008	$ 16,934	$ 4,668	$ (4,796)	$ 19,891	$ (2,901)	$ 72
Beginning Balance, in Shares at Dec. 31, 2008	1,194	1,334	(140)
Net income	$ 3,142			3,134		8
Currency translation adjustments	18				17	1
Changes in fair value of derivatives	143				143
Pension and other postretirement benefit plans	67				67
Shares sold to optionees less shares exchanged	110	$ (22)	$ 132
Shares granted to Directors	1		1
Vesting of restricted stock		(20)	20
Shares issued under employee stock purchase plan	166	25	141
Stock repurchase program	(500)		$ (500)
Stock-based compensation cost	186	186
Tax benefit on stock options	4	4
Dividends declared	(1,006)			(1,006)
Other	$ (36)	(64)				28
Shares sold to optionees less shares exchanged, in Shares	4		4
Vesting of restricted stock, in Shares	1		1
Shares issued under employee stock purchase plan, in Shares	4		4
Stock repurchase program, in Shares	(8)		(8)
Ending Balance at Dec. 31, 2009	$ 19,229	$ 4,777	$ (5,002)	22,019	(2,674)	109
Ending Balance, in Shares at Dec. 31, 2009	1,195	1,334	(139)
Net income	$ 4,266			4,267		(1)
Currency translation adjustments	(26)				(26)
Changes in fair value of derivatives	5				5
Pension and other postretirement benefit plans	(73)				(73)
Shares sold to optionees less shares exchanged	222	$ (8)	$ 230
Shares granted to Directors	2	1	1
Vesting of restricted stock		(11)	11
Shares issued under employee stock purchase plan	179	49	130
Stock repurchase program	(1,717)		(1,717)
Stock-based compensation cost	198	198
Tax benefit on stock options	14	14
Shares issued on conversions of debentures	320	17	303
Acquisition of Smith International, Inc.	9,939	6,880	2,948			111
Acquisition of noncontrolling interests	3	$ 3
Dividends declared	(1,076)			(1,076)
Other	$ (41)		$ (40)			(1)
Acquisition of Smith International, Inc, in Shares	176	100	76
Shares sold to optionees less shares exchanged, in Shares	6		6
Shares issued under employee stock purchase plan, in Shares	3		3
Stock repurchase program, in Shares	(27)		(27)
Issued on conversions of debentures, in Shares	8		8
Ending Balance at Dec. 31, 2010	$ 31,444	$ 11,920	$ (3,136)	25,210	(2,768)	218
Ending Balance, in Shares at Dec. 31, 2010	1,361	1,434	(73)
Net income	$ 5,013			4,997
Currency translation adjustments	(82)				(82)
Changes in fair value of derivatives	(71)				(71)
Pension and other postretirement benefit plans	(636)				(636)
Shares sold to optionees less shares exchanged	230	$ (29)	$ 259
Shares granted to Directors	2		2
Vesting of restricted stock		(39)	39
Shares issued under employee stock purchase plan	208	53	155
Stock repurchase program	(2,998)		$ (2,998)
Stock-based compensation cost	272	272
Tax benefit on stock options	15
Acquisition of noncontrolling interests	(639)	$ (553)				(86)
Dividends declared	(1,347)			(1,347)
Other	$ (19)					(19)
Shares sold to optionees less shares exchanged, in Shares	6	0	6
Vesting of restricted stock, in Shares	1		1
Shares issued under employee stock purchase plan, in Shares	3	0	3
Stock repurchase program, in Shares	(37)	0	(37)
Ending Balance at Dec. 31, 2011	$ 31,392	$ 11,639	$ (5,679)	$ 28,860	$ (3,557)	$ 129
Ending Balance, in Shares at Dec. 31, 2011	1,334	1,434	(100)

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Retained Earnings
Dividends declared, per share	$ 1.00	$ 0.84	$ 0.84

Business Description

12 Months Ended

Dec. 31, 2011

Business Description and Supplementary Information [Abstract]

Business Description

1. Business Description

Schlumberger Limited (Schlumberger N.V., incorporated in Curaçao) and its consolidated subsidiaries (collectively, “Schlumberger”) form the world’s leading supplier of technology, integrated project management and information solutions to customers in the oil and gas industry worldwide, providing the industry’s widest range of oilfield services from exploration to production.

Summary of Accounting Policies

12 Months Ended

Dec. 31, 2011

Summary of Accounting Policies [Abstract]

Summary of Accounting Policies

2. Summary of Accounting Policies

The Consolidated Financial Statements of Schlumberger have been prepared in accordance with accounting principles generally accepted in the United States of America.

Principles of Consolidation

The accompanying Consolidated Financial Statements include the accounts of Schlumberger, its wholly-owned subsidiaries, and subsidiaries over which it exercises a controlling financial interest. All significant intercompany transactions and balances have been eliminated. Investments in entities in which Schlumberger does not have a controlling financial interest, but over which it has significant influence are accounted for using the equity method. Schlumberger’s share of the after-tax earnings of equity method investees is included in Interest and other income, net. Investments in which Schlumberger does not have the ability to exercise significant influence are accounted for using the cost method. Both equity and cost method investments are classified in Investments in Affiliated Companies.

Reclassifications

Certain prior year items have been reclassified to conform to the current year presentation.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. On an on-going basis, Schlumberger evaluates its estimates, including those related to collectibility of accounts receivable; valuation of inventories and investments; recoverability of goodwill, intangible assets and investments in affiliates; income taxes; multiclient seismic data; contingencies and actuarial assumptions for employee benefit plans. Schlumberger bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

Revenue Recognition

Schlumberger recognizes revenue based upon purchase orders, contracts or other persuasive evidence of an arrangement with the customer that include fixed or determinable prices provided that collectibility is reasonably assured. Revenue is recognized for services when they are rendered. Revenue is recognized for products upon delivery, when the customer assumes the risks and rewards of ownership. Certain products may be provided on a consigned basis in which case revenue is recognized when the products are consumed provided that all other revenue recognition criteria have been met.

Revenue from seismic contract services performed on a dayrate basis is recognized as the service is performed. Revenue from other services, including pre-funded multiclient surveys, is recognized as the seismic data is acquired and/or processed on a proportionate basis as work is performed. This method requires revenue to be recognized based upon quantifiable measures of progress, such as square kilometers acquired. Multiclient data surveys are licensed or sold to customers on a non-transferable basis. Revenue from sales of completed multiclient data surveys is recognized upon obtaining a signed licensing agreement and providing customers with access to such data.

Revenue is occasionally generated from contractual arrangements that include multiple deliverables. Revenue from these arrangements is recognized as each item is delivered based on their relative fair value and when the delivered items have stand-alone value to the customer.

Revenue derived from the sale of licenses of Schlumberger software may include installation, maintenance, consulting and training services. If services are not essential to the functionality of the software, the revenue for each element of the contract is recognized separately based on its respective vendor specific objective evidence of fair value when all of the following conditions are met: a signed contract is obtained, delivery has occurred, the fee is fixed or determinable and collectibility is probable.

Translation of Non-United States Currencies

The functional currency of Schlumberger is primarily the US dollar. Assets and liabilities recorded in functional currencies other than US dollars are translated at period end exchange rates. The resulting adjustments are charged or credited directly to the Equity section of the Consolidated Balance Sheet. Revenue and expenses are translated at the weighted-average exchange rates for the period. Realized and unrealized transaction gains and losses are included in income in the period in which they occur. Transaction losses of $25 million and $27 million, net of hedging activities, were recognized in 2011 and 2010, respectively. Transaction gains of $73 million, net of hedging activities, were recognized during 2009.

Investments

The Consolidated Balance Sheet reflects the Schlumberger investment portfolio separated between current and long term, based on maturity. Both Short-term investments and Fixed Income Investments, held to maturity are comprised primarily of money market funds, eurodollar time deposits, certificates of deposit, commercial paper, euro notes and Eurobonds, and are substantially denominated in US dollars. Under normal circumstances it is the intent of Schlumberger to hold the investments until maturity, with the exception of investments that are considered trading (December 31, 2011—$190 million; December 31, 2010—$189 million). Short-term investments that are designated as trading are stated at fair value, which is estimated using quoted market prices for those or similar investments. All other investments are stated at cost plus accrued interest, which approximates market. The unrealized gains/losses on investments designated as trading were not significant at both December 31, 2011 and 2010.

For purposes of the Consolidated Statement of Cash Flows, Schlumberger does not consider short-term investments to be cash equivalents.

Fixed Income Investments, held to maturity at December 31, 2011 of $256 million mature as follows: $80 million in 2013, $166 million in 2014 and $10 million in 2015.

Inventories

Inventories are stated at average cost or at market, whichever is lower. Costs included in Inventories consist of materials, direct labor and manufacturing overhead.

Fixed Assets and Depreciation

Fixed assets are stated at cost less accumulated depreciation, which is provided for by charges to income over the estimated useful lives of the assets using the straight-line method. Fixed assets include the manufacturing cost of oilfield technical equipment manufactured or assembled by subsidiaries of Schlumberger. Expenditures for replacements and improvements are capitalized. Maintenance and repairs are charged to operating expenses as incurred. Upon sale or other disposition, the applicable amounts of asset cost and accumulated depreciation are removed from the balance sheet and the net amount, less proceeds from disposal, is charged or credited to income.

Multiclient Seismic Data

The multiclient library consists of completed and in-process seismic surveys that are licensed on a nonexclusive basis. Multiclient surveys are primarily generated utilizing Schlumberger resources. Schlumberger capitalizes costs directly incurred in acquiring and processing the multiclient seismic data. Such costs are charged to Cost of revenue – Oilfield Services based on the percentage of the total costs to the estimated total revenue that Schlumberger expects to receive from the sales of such data. However, under no circumstance will an individual survey carry a net book value greater than a 4-year, straight-line amortized value.

The carrying value of the multiclient library is reviewed for impairment annually as well as when an event or change in circumstance indicating impairment may have occurred. Adjustments to the carrying value are recorded when it is determined that estimated future cash flows, which involves significant judgment on the part of Schlumberger, would not be sufficient to recover the carrying value of the surveys. Significant adverse changes in Schlumberger’s estimated future cash flows could result in impairment charges in a future period.

Goodwill, Other Intangibles and Long-lived Assets

Schlumberger records the excess of purchase price over the fair value of the tangible and identifiable intangible assets acquired as goodwill. The goodwill relating to each of Schlumberger’s reporting units is tested for impairment annually as well as when an event, or change in circumstances, indicates an impairment may have occurred.

Under generally accepted accounting principles, Schlumberger has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of one of its reporting units is greater than its carrying amount. If, after assessing the totality of events or circumstances, Schlumberger determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then there is no need to perform any further testing. However, if Schlumberger concludes otherwise, then it is required to perform the first step of a two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. If the fair value of the reporting unit is less than its carrying value, an impairment loss is recorded to the extent that the implied fair value of the goodwill of the reporting unit is less than its carrying value.

Schlumberger has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test.

For purposes of performing the impairment test for goodwill, Schlumberger’s four reporting units are the three Groups comprising Oilfield Services: Reservoir Characterization, Drilling and Reservoir Production, as well as the Distribution business segment. Schlumberger elected to perform the qualitative assessment described above for purposes of its annual goodwill impairment test. Based on this assessment, Schlumberger concluded that it was more likely than not that the fair value of each of its reporting units was greater than its carrying amount. Accordingly, no further testing was required.

Long-lived assets, including fixed assets and intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. In reviewing for impairment, the carrying value of such assets is compared to the estimated undiscounted future cash flows expected from the use of the assets and their eventual disposition. If such cash flows are not sufficient to support the asset’s recorded value, an impairment charge is recognized to reduce the carrying value of the long-lived asset to its estimated fair value. The determination of future cash flows as well as the estimated fair value of long-lived assets involve significant estimates on the part of management. If there is a material change in economic conditions or other circumstances influencing the estimate of future cash flows or fair value, Schlumberger could be required to recognize impairment charges in the future.

Intangible assets consist primarily of customer relationships, technology/technical know-how and tradenames acquired in business combinations. Customer relationships are generally amortized over periods ranging from 7 to 28 years, acquired technology/technical know-how are generally amortized over periods ranging from 5 to 18 years and tradenames are generally amortized over periods ranging from 5 years to 30 years.

Taxes on Income

Schlumberger computes taxes on income in accordance with the tax rules and regulations of the many taxing authorities where the income is earned. The income tax rates imposed by these taxing authorities vary substantially. Taxable income may differ from pretax income for financial accounting purposes. To the extent that differences are due to revenue or expense items reported in one period for tax purposes and in another period for financial accounting purposes, an appropriate provision for deferred income taxes is made. Any effect of changes in income tax rates or tax laws are included in the provision for income taxes in the period of enactment. When it is more likely than not that a portion or all of the deferred tax asset will not be realized in the future, Schlumberger provides a corresponding valuation allowance against deferred tax assets.

Schlumberger’s tax filings are subject to regular audit by the tax authorities in most of the jurisdictions in which it conducts business. These audits may result in assessments for additional taxes which are resolved with the authorities or, potentially, through the courts. Schlumberger recognizes the impact of a tax position in its financial statements if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Tax liabilities are recorded based on estimates of additional taxes which will be due upon the conclusion of these audits. Estimates of these tax liabilities are made based upon prior experience and are updated in light of changes in facts and circumstances. However, due to the uncertain and complex application of tax regulations, it is possible that the ultimate resolution of audits may result in liabilities which could be materially different from these estimates. In such an event, Schlumberger will record additional tax expense or tax benefit in the year in which such resolution occurs.

Schlumberger generally does not provide income taxes relating to undistributed earnings, as the earnings either would not be taxable when remitted or are considered to be indefinitely reinvested.

Concentration of Credit Risk

Schlumberger’s assets that are exposed to concentrations of credit risk consist primarily of cash, short-term investments, fixed income investments held to maturity, receivables from clients and derivative financial instruments. Schlumberger places its cash, short-term investments and fixed income investments held to maturity with financial institutions and corporations, and limits the amount of credit exposure with any one of them. Schlumberger regularly evaluates the creditworthiness of the issuers in which it invests. The receivables from clients are spread over many countries and customers. Schlumberger maintains an allowance for uncollectible accounts receivable based on expected collectibility and performs ongoing credit evaluations of its customers’ financial condition. By using derivative financial instruments to hedge exposure to changes in exchange rates and commodity prices, Schlumberger exposes itself to some credit risk. Schlumberger minimizes this credit risk by entering into transactions with high-quality counterparties, limiting the exposure to each counterparty and monitoring the financial condition of its counterparties.

Research & Engineering

All research and engineering expenditures are expensed as incurred.

Earnings per Share

Basic earnings per share of Schlumberger from continuing operations is calculated by dividing income from continuing operation attributable to Schlumberger by the weighted average number of common shares outstanding during the year. Diluted earnings per share is calculated by first adding back to net income the interest expense on any outstanding convertible debentures and then dividing this adjusted income from continuing operations attributable to Schlumberger by the sum of (i) unvested restricted stock units; and (ii) the weighted average number of common shares outstanding assuming dilution. The weighted average number of common shares outstanding assuming dilution assumes (a) that all stock options which are in the money are exercised at the beginning of the period and that the proceeds are used by Schlumberger to purchase shares at the average market price for the period, and (b) the conversion of any outstanding convertible debentures.

The following is a reconciliation from basic to diluted earnings per share from continuing operations of Schlumberger for each of the last three years:


(Stated in million except per share amounts)
	Schlumberger Income from Continuing Operations		Weighted Average Shares Outstanding		Earnings Per Share from from Continuing Operations
2011:
Basic	$	4,777		1,349	$	3.54

Assumed exercise of stock options		–		10
Unvested restricted stock		–		2

Diluted	$	4,777		1,361	$	3.51

2010:
Basic	$	4,267		1,250	$	3.41

Assumed conversion of debentures		3		2
Assumed exercise of stock options		–		9
Unvested restricted stock		–		2

Diluted	$	4,270		1,263	$	3.38

2009:
Basic	$	3,156		1,198	$	2.63

Assumed conversion of debentures		8		8
Assumed exercise of stock options		–		7
Unvested restricted stock		–		1

Diluted	$	3,164		1,214	$	2.61

Employee stock options to purchase approximately 14.0 million, 12.5 million and 17.1 million shares of common stock at December 31, 2011, 2010 and 2009, respectively, were outstanding but were not included in the computation of diluted earnings per share because the option exercise price was greater than the average market price of the common stock, and therefore, the effect on diluted earnings per share would have been anti-dilutive.

Charges and Credits

12 Months Ended

Dec. 31, 2011

Charges and Credits [Abstract]

Charges and Credits

3. Charges and Credits

Schlumberger recorded the following Charges and Credits in continuing operations during 2011, 2010 and 2009:

2011

Fourth quarter of 2011:

—

Schlumberger recorded $22 million of pretax merger and integration-related charges ($20 million after-tax) in connection with the acquisitions of Smith International, Inc. (“Smith”) and Geoservices (see Note 4 – Acquisitions).

—

During the fourth quarter, Schlumberger was able to physically assess the status of its assets in Libya. This assessment resulted in Schlumberger recording a pretax and after-tax charge of $60 million relating to certain assets that are no longer recoverable as a result of the political unrest.

Third quarter of 2011:

—

Schlumberger recorded $27 million of pretax merger and integration-related charges ($23 million after-tax) in connection with the acquisitions of Smith and Geoservices.

Second quarter of 2011:

—

Schlumberger made a $50 million grant to the Schlumberger Foundation to support the Foundation’s Faculty for the Future program, which supports talented women scientists from the developing world by helping them pursue advanced graduate studies in scientific disciplines at leading universities worldwide. As a result, Schlumberger recorded a $50 million charge ($40 million after-tax).

Schlumberger recorded $32 million of pretax merger and integration-related charges ($24 million after-tax) in connection with the acquisitions of Smith and Geoservices.

First quarter of 2011:

—

Schlumberger recorded $34 million of pretax merger and integration-related charges ($28 million after-tax) in connection with the acquisitions of Smith and Geoservices.

The following is a summary of these charges:


(Stated in millions)
	Pretax		Tax		Net		Consolidated Statement of Income Classification
Merger-related integration costs	$	115	$	19	$	96	Merger & integration
Donation to the Schlumberger Foundation		50		10		40	General & administrative
Write-off of assets in Libya		60		–		60	Cost of revenue -Oilfield Services

	$	225	$	29	$	196

2010

Fourth quarter of 2010:

—

In connection with the acquisition of Smith, Schlumberger recorded the following pretax charges: $115 million ($73 million after-tax) relating to the amortization of purchase accounting adjustments associated with the write-up of acquired inventory to its estimated fair value, $17 million ($16 million after-tax) of professional and other fees and $16 million ($12 million after-tax) relating to employee benefits.

—

Schlumberger repurchased the following debt:


	(Stated in millions)
	Carrying Value
6.50% Notes due 2012	$	297
6.75% Senior Notes due 2011	$	123
9.75% Senior Notes due 2019	$	212
6.00% Senior Notes due 2016	$	102
8.625% Senior Notes due 2014	$	88

As a result of these transactions, Schlumberger incurred pretax charges of $32 million ($20 million after-tax).

Third quarter of 2010:

—

As a result of the decision to rationalize support costs across the organization as well as to restructure the North America land operations to provide greater operating efficiency, Schlumberger recorded a pretax charge of $90 million ($77 million after-tax).

—

Following the successful introduction of UniQ, a new generation single-sensor land acquisition system, Schlumberger recorded a $78 million pretax charge ($71 million after-tax), related to the impairment of WesternGeco’s first generation Q-Land system assets.

—

A pretax and after-tax charge of $63 million primarily relating to the early termination of a vessel lease associated with WesternGeco’s electromagnetic service offering as well as related assets, including a $30 million impairment related to an equity-method investment.

—

In connection with the acquisition of Smith, Schlumberger recorded the following pretax charges: $56 million ($55 million after-tax) of merger-related transaction costs including advisory and legal fees, $41 million ($35 million after-tax) relating to employee benefits for change in control payments and retention bonuses and $38 million ($24 million after-tax) relating to the amortization of purchase accounting adjustments associated with the write-up of acquired inventory to its estimated fair value.

—

$40 million pretax charge ($36 million after-tax) for the early termination of rig contracts and workforce reductions in Mexico due to the slowdown of project activity.

—

Schlumberger repurchased $352 million of its 6.50% Notes due 2012 and, as a result, incurred a pretax charge of $28 million ($18 million after-tax).

—

Schlumberger recorded a pretax gain of $1.27 billion ($1.24 billion after-tax) as a result of remeasuring its previously held 40% equity interest in the M-I SWACO joint venture. Refer to Note 4—Acquisitions for further details.

First quarter of 2010:

—

Schlumberger incurred $35 million of pretax and after-tax merger-related costs in connection with the Smith and Geoservices transactions. These costs primarily consisted of advisory and legal fees.

—

During March 2010, the Patient Protection and Affordable Care Act (PPACA) was signed into law in the United States. Among other things, the PPACA eliminates the tax deductibility of retiree prescription drug benefits to the extent of the Medicare Part D subsidy that companies, such as Schlumberger, receive. As a result of this change in law, Schlumberger recorded a $40 million charge to adjust its deferred tax assets to reflect the loss of this future tax deduction.

The following is a summary of 2010 Charges and Credits:


					(Stated in millions)
	Pretax			Tax			Net			Consolidated Statement of Income Classification
Restructuring and Merger-related Charges:
Severance and other	$	90		$	13		$	77		Restructuring & other
Impairment relating to WesternGeco’s first generation Q-Land acquisition system		78			7			71		Restructuring & other
Other WesternGeco-related charges		63			–			63		Restructuring & other
Professional fees and other		107			1			106		Merger & integration
Merger-related employee benefits		58			10			48		Merger & integration
Inventory fair value adjustments		153			56			97		Cost of revenue -Oilfield Services
Mexico restructuring		40			4			36		Restructuring & other
Repurchase of bonds		60			23			37		Restructuring & other

Total restructuring and merger-related charges		649			114			535

Gain on investment in M-I SWACO		(1,270	)		(32	)		(1,238	)	Gain on Investment in M-I SWACO
Impact of elimination of tax deduction related to Medicare Part D subsidy		–			(40	)		40		Taxes on income

	$	(621	)	$	42		$	(663	)

2009

Second quarter of 2009:

—

Schlumberger continued to reduce its global workforce as a result of the slowdown in oil and gas exploration and production spending and its effect on activity in the oilfield services sector. As a result of these actions, Schlumberger recorded a pretax charge of $102 million ($85 million after-tax). These workforce reductions were completed by the end of 2009.

—

As a consequence of these workforce reductions, Schlumberger recorded pretax non-cash pension and other postretirement benefit curtailment charges of $136 million ($122 million after-tax). Refer to Note 18 – Pension and Other Benefit Plans for further details.

The following is a summary of these charges:


			(Stated in millions)
	Pretax		Tax		Net		Consolidated Statement of Income Classification
Workforce reductions	$	102	$	17	$	85	Restructuring & other
Postretirement benefits curtailment		136		14		122	Restructuring & other

	$	238	$	31	$	207

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

Acquisitions

12 Months Ended

Dec. 31, 2011

Acquisitions [Abstract]

Acquisitions

4. Acquisitions

Acquisition of Smith International, Inc.

On August 27, 2010, Schlumberger acquired all of the outstanding shares of Smith, a leading supplier of premium products and services to the oil and gas exploration and production industry. The transaction brought together the complementary drilling and measurements technologies and expertise of Schlumberger and Smith in order to facilitate the engineering of complete drilling systems which optimize all of the components of the drill string. Such systems will enable Schlumberger’s customers to achieve improved drilling efficiency, better well placement and increased wellbore assurance as they face increasingly more challenging environments. In addition, Schlumberger’s geographic footprint will facilitate the extension of joint offerings on a worldwide basis.

Under the terms of the transaction, Smith became a wholly-owned subsidiary of Schlumberger. Each share of Smith common stock issued and outstanding immediately prior to the effective time of the acquisition was converted into the right to receive 0.6966 shares of Schlumberger common stock, with cash paid in lieu of fractional shares.

At the effective time of the acquisition, each outstanding option to purchase Smith common stock was converted into a stock option to acquire shares of Schlumberger common stock on the same terms and conditions as were in effect immediately prior to the completion of the transaction. The number of shares of Schlumberger common stock underlying each converted Smith stock option was determined by multiplying the number of Smith stock options by the 0.6966 exchange ratio, and rounding down to the nearest whole share. The exercise price per share of each converted Smith stock option was determined by dividing the per share exercise price of such stock option by the 0.6966 exchange ratio, and rounded up to the nearest whole cent. Smith stock options, whether or not then vested and exercisable, became fully vested and exercisable and assumed by Schlumberger at the effective date of the acquisition in accordance with preexisting change-in-control provisions. Smith stock options were converted into 0.6 million of Schlumberger stock options.

At the effective time of the acquisition, Smith restricted stock units, whether or not then vested, became fully vested (except for grants between the date of the acquisition agreement and closing, which were not significant and did not automatically vest) and were converted into shares of Schlumberger common stock, determined by multiplying the number of shares of Smith common stock subject to each award by the 0.6966 exchange ratio, rounded to the nearest whole share (assuming, in the case of performance-based Smith restricted stock unit awards, the deemed attainment of the performance goals under the award at the target level).

Smith’s results of operations have been included in Schlumberger’s financial statements for periods subsequent to the effective date of the acquisition. Smith contributed revenues of $3.3 billion and net income of $160 million (including the recurring effects of purchase accounting) to Schlumberger for the period from the closing of the transaction through December 31, 2010. Smith reported revenue of approximately $6.0 billion (unaudited) for the period from January 1, 2010 to August 27, 2010 and $8.2 billion in 2009.

Calculation of Consideration Transferred

The following details the fair value of the consideration transferred to effect the acquisition of Smith.


(Stated in millions, except exchange ratio and per share amounts)
Number of shares of Smith common stock outstanding as of the acquisition date		248
Number of Smith unvested restricted stock units outstanding as of the acquisition date		4

		252
Multiplied by the exchange ratio		0.6966

Equivalent Schlumberger shares of common stock issued		176
Schlumberger closing stock price on August 27, 2010	$	55.76

Common stock equity consideration	$	9,812
Fair value of Schlumberger equivalent stock options issued		16

Total fair value of the consideration transferred	$	9,828

Certain amounts reflect rounding adjustments

Allocation of Consideration Transferred to Net Assets Acquired

The following amounts represent the preliminary estimates of the fair value of identifiable assets acquired and liabilities assumed in the acquisition as of December 31, 2010.


(Stated in millions)
Cash	$	399
Receivables		1,831
Inventories ⁽¹⁾		2,013
Fixed assets		2,017
Intangible assets:
Tradenames (weighted-average life of 25 years)		1,560
Technology (weighted-average life of 16 years)		1,170
Customer relationships (weighted average life of 23 years)		1,360
Other assets		429
Accounts payable and accrued liabilities		(1,460	)
Long-term debt ⁽²⁾		(2,141	)
Deferred taxes ⁽³⁾		(1,936	)
Other liabilities		(528	)

	$	4,714
Less:
Investment in M-I SWACO ⁽⁴⁾		(1,429	)
Noncontrolling interests		(111	)

Total identifiable net assets	$	3,174
Gain on investment in M-I SWACO ⁽⁴⁾		(1,238	)
Goodwill ⁽⁵⁾		7,892

Total consideration transferred	$	9,828

The preliminary allocation of the consideration transferred to net assets acquired presented in the table above was revised in 2011 to reflect the final allocations. The net result of adjustments made in 2011, which primarily related to deferred taxes and accrued liabilities, was to increase goodwill by $194 million.

(1)

Schlumberger recorded an adjustment of approximately $155 million to write-up the acquired inventory to its estimated fair value. Schlumberger’s cost of revenue reflected this increased valuation as this inventory was sold. Accordingly, Schlumberger’s margins were temporarily reduced in the initial periods subsequent to the acquisition.

(2)

In connection with the acquisition, Schlumberger assumed all of the debt obligations of Smith, including its long-term fixed rate notes consisting of the following: $220 million 6.75% Senior Notes due 2011, $300 million 8.625% Senior Notes due 2014, $275 million 6.00% Senior Notes due 2016 and $700 million 9.75% Senior Notes due 2019. Schlumberger recorded a $417 million adjustment to increase the carrying amount of these notes to their estimated fair value. This adjustment was being amortized as a reduction of interest expense over the remaining term of the respective obligations up until such notes were repurchased in the fourth quarter of 2010 and the first quarter of 2011.

(3)

In connection with the acquisition accounting, Schlumberger provided deferred taxes related to, among other items, the estimated fair value adjustments for acquired inventory, intangible assets and assumed debt obligations. Included in the provisions for deferred taxes are amounts relating to the outside basis difference associated with shares in certain Smith non-US subsidiaries for which no taxes have previously been provided. Schlumberger expects to reverse the outside basis difference primarily through the reorganization of those subsidiaries as well as through repatriating earnings in lieu of permanently reinvesting them.

(4)

Prior to the completion of the acquisition, Smith and Schlumberger operated M-I SWACO, a drilling fluids joint venture that was 40% owned by Schlumberger and 60% owned by Smith. Effective at the closing of the transaction, M-I SWACO became owned 100% by Schlumberger. As a result of obtaining control of this joint venture, Schlumberger was required under generally accepted accounting principles to remeasure its previously held equity interest in the joint venture at its acquisition-date fair value and recognize the resulting pretax gain of $1.3 billion ($1.2 billion after-tax) in earnings. This gain is classified as Gain on Investment in M-I SWACO in the Consolidated Statement of Income.

Prior to acquiring Smith, Schlumberger recorded income relating to this venture using the equity method of accounting. Schlumberger’s equity income from this joint venture was $78 million in 2010 (representing the period from January 1, 2010 to August 27, 2010), and $131 million in 2009. Schlumberger received cash distributions from the joint venture of $50 million in 2010 and $106 million in 2009.

(5)

The goodwill recognized is primarily attributable to expected synergies that will result from combining the operations of Schlumberger and Smith as well as intangible assets that do not qualify for separate recognition. Approximately $0.2 billion of the goodwill is deductible for income tax purposes.

Acquisition of Geoservices

On April 23, 2010, Schlumberger completed the acquisition of Geoservices, a privately owned oilfield services company specializing in mud logging, slickline and production surveillance operations, for $915 million in cash.

The purchase price has been allocated to the net assets acquired upon their estimated fair values as follows:


	(Stated in millions)

Cash	$	26
Fixed assets		75
Goodwill		658
Intangible assets		377
Other assets		150
Long-term debt		(145	)
Deferred taxes		(68	)
Other liabilities		(158	)

	$	915

The long-term debt was repaid at the time of closing.

Intangible assets recorded in connection with this transaction, which primarily relate to customer relationships, will be amortized over a weighted average period of approximately 17 years. The amount allocated to goodwill represents the excess of the purchase price over the fair value of the net assets acquired and is not tax deductible for income tax purposes.

Other Acquisitions

Schlumberger has made other acquisitions and investments, none of which were significant on an individual basis, for cash payments, net of cash acquired, of $610 million during 2011, $212 million during 2010, and $514 million during 2009.

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Appendix F
-Paragraph F4
-Subparagraph e

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
-Paragraph 1
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Inventory

12 Months Ended

Dec. 31, 2011

Inventory [Abstract]

Inventory

5. Inventory

A summary of inventory follows:


(Stated in millions)
As at December 31,	2011		2010
Raw materials & field materials	$	2,066	$	1,833
Work in process		364		249
Finished goods		2,270		1,722

	$	4,700	$	3,804

Fixed Assets

12 Months Ended

Dec. 31, 2011

Fixed Assets [Abstract]

Fixed Assets

6. Fixed Assets

A summary of fixed assets follows:


(Stated in millions)
As at December 31,	2011		2010
Land		$362		$314
Buildings & improvements		2,912		2,631
Machinery & equipment		24,404		21,873
Seismic vessels		1,873		1,861

		29,551		26,679
Less accumulated depreciation		16,558		14,608

		$12,993		$12,071

The estimated useful lives of Buildings & improvements are primarily 30 to 40 years. The estimated useful lives of Machinery & equipment are primarily 5 to 10 years. Seismic vessels are depreciated over periods ranging from 20 to 30 years.

Depreciation expense relating to fixed assets was $2.7 billion, $2.4 billion and $2.1 billion in 2011, 2010 and 2009, respectively.

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

Long-term Debt and Debt Facility Agreements [Abstract]

Multiclient Seismic Data

12 Months Ended

Dec. 31, 2011

Multiclient Seismic Data [Abstract]

Multiclient Seismic Data

7. Multiclient Seismic Data

The change in the carrying amount of multiclient seismic data is as follows:


(Stated in millions)
	2011			2010
Balance at beginning of year		$394			$288
Capitalized in year		289			326
Charged to expense		(258	)		(220	)

		$425			$394

Goodwill

12 Months Ended

Dec. 31, 2011

Goodwill [Abstract]

Goodwill

8. Goodwill

In connection with the change in reportable segments as discussed in Note 17—Segment Information, Schlumberger reallocated the goodwill that existed as of December 31, 2010 to the new reporting units on a relative fair value basis. The change in the carrying amount of goodwill during 2011 was as follows:


(Stated in millions)
	Reservoir Characterization			Drilling			Reservoir Production			Distribution		Total
Balance at January 1, 2011		$3,381			$8,150			$2,351			$70		$13,952
Adjustments relating to Smith acquisition		–			175			13			6		194
Other acquisitions		42			45			–			–		87
Divestiture of business		(51	)		–			–			–		(51	)
Impact of changes in exchange rates		(12	)		(8	)		(8	)		–		(28	)

Balance, December 31, 2011		$3,360			$8,362			$2,356			$76		$14,154

The change in the carrying amount of goodwill during 2010 was as follows:


(Stated in millions)
Balance, January 1, 2010	$	5,305
Acquisition of Smith		7,892
Other additions		761
Impact of change in exchange rates		(6	)

Balance, December 31, 2010	$	13,952

Intangible Assets

12 Months Ended

Dec. 31, 2011

Intangible Assets [Abstract]

Intangible Assets

9. Intangible Assets

Intangible assets principally comprise technology/technical know-how, tradenames and customer relationships. At December 31, the gross book value and accumulated amortization of intangible assets were as follows:


(Stated in millions)
	2011						2010
	Gross Book Value		Accumulated Amortization		Net Book Value		Gross Book Value		Accumulated Amortization		Net Book Value
Technology/Technical Know-How	$	1,875	$	341	$	1,534	$	1,846	$	215	$	1,631
Tradenames		1,677		131		1,546		1,678		61		1,617
Customer Relationships		1,954		209		1,745		1,963		129		1,834
Other		356		299		57		378		298		80

	$	5,862	$	980	$	4,882	$	5,865	$	703	$	5,162

Amortization expense was $325 million in 2011, $190 million in 2010 and $114 million in 2009.

The weighted average amortization period for all intangible assets is approximately 21 years.

Amortization expense for the subsequent five years is estimated to be as follows: 2012—$323 million, 2013—$304 million, 2014—$298 million, 2015—$287 million and 2016—$268 million.

Long-term Debt and Debt Facility Agreements

12 Months Ended

Dec. 31, 2011

Long-term Debt and Debt Facility Agreements

10. Long-term Debt and Debt Facility Agreements

Long-term Debt consists of the following:


(Stated in millions)
As at December 31,	2011		2010
3.300% Senior Notes due 2021		$1,595		$–
4.50% Guaranteed Notes due 2014		1,297		1,319
2.75% Guaranteed Notes due 2015		1,290		1,310
1.950% Senior Notes due 2016		1,099		–
4.200% Senior Notes due 2021		1,099		–
5.25% Guaranteed Notes due 2013		649		659
2.650% Senior Notes due 2016		498		–
3.00% Guaranteed Notes due 2013		450		450
Floating Rate Senior Notes due 2014		300		–
9.75% Senior Notes due 2019		–		776
8.625% Senior Notes due 2014		–		272
6.00% Senior Notes due 2016		–		218
Commercial paper borrowings		–		367
Other variable rate debt		271		133

		8,548		5,504
Fair value adjustment – hedging ⁽¹⁾		8		13

		$8,556		$5,517

⁽¹⁾	Represents changes in the fair value of the portion of Schlumberger’s fixed rate debt that is hedged through the use of interest rate swaps.

During the third quarter of 2011, Schlumberger issued $1.1 billion of 1.950% Senior Notes due 2016, $1.6 billion of 3.300% Senior Notes due 2021 and $300 million of Floating Rate Senior Notes due 2014 that bear interest at a rate equal to three-month LIBOR plus 55 basis points per year.

During the first quarter of 2011, Schlumberger issued $1.1 billion of 4.200% Senior Notes due 2021.

During the first quarter of 2011, Schlumberger issued $500 million of 2.650% Senior Notes due 2016. Schlumberger entered into agreements to swap these dollar notes for euros on the date of issue until maturity, effectively making this a euro denominated debt on which Schlumberger will pay interest in euros at a rate of 2.39%.

During the first quarter of 2011, Schlumberger repurchased all of the outstanding 9.75% Senior Notes due 2019, the 8.625% Senior Notes due 2014 and the 6.00% Senior Notes due 2016 for approximately $1.26 billion. These transactions did not result in any significant gains or losses.

During the third and fourth quarters of 2010, Schlumberger repurchased all of its $650 million 6.50% Notes due 2012.

Schlumberger maintains a €3.0 billion Euro Medium Term Note program that provides for the issuance of various types of debt instruments such as fixed or floating rate notes in euro, US dollar or other currencies. Schlumberger issued €1.0 billion 2.75% Guaranteed Notes due 2015 in the fourth quarter of 2010 under this program. Schlumberger entered into agreements to swap these euro notes for US dollars on the date of issue until maturity, effectively making this a US dollar denominated debt on which Schlumberger will pay interest in US dollars at a rate of 2.56%. Schlumberger also issued €1.0 billion 4.50% Guaranteed Notes due 2014 in the first quarter of 2009 under this program. Schlumberger entered into agreements to swap these euro notes for US dollars on the date of issue until maturity, effectively making this a US dollar denominated debt on which Schlumberger will pay interest in US dollars at a rate of 4.95%.

During the third quarter of 2009, Schlumberger issued $450 million of 3.00% Guaranteed Notes due 2013.

Commercial paper borrowings outstanding at December 31, 2011 and 2010 include certain notes issued in currencies other than the US dollar which were swapped for US dollars and pounds sterling on the date of issue until maturity. Commercial paper borrowings are classified as long-term debt to the extent of their backup by available and unused committed credit facilities maturing in more than one year and to the extent it is Schlumberger’s intent to maintain these obligations for longer than one year.

At December 31, 2011, Schlumberger had separate committed debt facility agreements aggregating $4.1 billion with commercial banks, of which $2.8 billion was available and unused. This included $3.5 billion of committed facilities which support commercial paper programs in the United States and Europe, of which $0.5 billion mature in December 2012 and $3.0 billion mature in July 2016. Interest rates and other terms of borrowing under these lines of credit vary from country to country. Borrowings under the commercial paper programs at December 31, 2011 were $0.9 billion ($1.9 billion at December 31, 2010). At December 31, 2011, all of the $0.9 billion of outstanding commercial paper borrowings were classified within Long-term debt – current portion in the Consolidated Balance Sheet.

A summary of Long-term Debt by currency, analyzed by Bonds and Notes, Commercial Paper (CP) and Other, at December 31 follows. As described in further detail above, the currencies are presented after taking into account currency swaps entered into on the date of issuance until maturity.

(Stated in millions)

2011

2010

Bonds and
Notes

Other

Total

Bonds and
Notes

Other

Total

US dollar

$7,787

$–

$47

$7,834

$5,017

$–

$104

$5,121

Euro

498

–

151

649

–

183

–

183

Norwegian kroner

–

Pound sterling

–

184

–

184

Other

–

$8,285

$–

$271

$8,556

$5,017

$367

$133

$5,517

The weighted average interest rate on variable rate debt as of December 31, 2011 was 2.8%.

Long-term Debt as of December 31, 2011, is due as follows: $1.168 billion in 2013, $1.605 billion in 2014, $1.297 billion in 2015, $1.792 billion in 2016 and $2.694 billion after 2016.

The fair value of Schlumberger’s Long-term Debt at December 31, 2011 and December 31, 2010 was $8.9 billion and $5.6 billion, respectively, and was estimated based on quoted market prices.

Convertible Debentures

During 2003, Schlumberger Limited issued $450 million aggregate principal amount of 2.125% Series B Convertible Debentures due June 1, 2023. The Series B debentures were convertible into common stock at a conversion rate of 25.000 shares for each $1,000 of principal (equivalent to an initial conversion price of $40.00 per share).

At December 31, 2009, there were $321 million of the Series B debentures outstanding. During 2010, $320 million of these debentures were converted by holders into 8.0 million shares of Schlumberger common stock and the remaining $1 million of outstanding Series B convertible debentures were redeemed for cash. Consequently, there were no convertible debentures outstanding at December 31, 2010.

Derivative Instruments and Hedging Activities

12 Months Ended

Dec. 31, 2011

Derivative Instruments and Hedging Activities [Abstract]

Derivative Instruments and Hedging Activities

11. Derivative Instruments and Hedging Activities

Schlumberger is exposed to market risks related to fluctuations in foreign currency exchange rates, commodity prices and interest rates. To mitigate these risks, Schlumberger utilizes derivative instruments. Schlumberger does not enter into derivatives for speculative purposes.

Foreign Currency Exchange Rate Risk

As a multinational company, Schlumberger conducts its business in approximately 85 countries. Schlumberger’s functional currency is primarily the US dollar, which is consistent with the oil and gas industry. Approximately 75% of Schlumberger’s revenue in 2011 was denominated in US dollars. However, outside the United States, a significant portion of Schlumberger’s expenses is incurred in foreign currencies. Therefore, when the US dollar weakens (strengthens) in relation to the foreign currencies of the countries in which Schlumberger conducts business, the US dollar—reported expenses will increase (decrease).

Schlumberger is exposed to risks on future cash flows to the extent that local currency expenses exceed revenues denominated in local currency that are other than the functional currency. Schlumberger uses foreign currency forward contracts and foreign currency options to provide a hedge against a portion of these cash flow risks. These contracts are accounted for as cash flow hedges, with the effective portion of changes in the fair value of the hedge recorded on the Consolidated Balance Sheet and in Accumulated other comprehensive loss. Amounts recorded in Accumulated other comprehensive loss are reclassified into earnings in the same period or periods that the hedged item is recognized in earnings. The ineffective portion of changes in the fair value of hedging instruments, if any, is recorded directly to earnings.

At December 31, 2011, Schlumberger recognized a cumulative net $26 million loss in Accumulated other comprehensive loss relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges, the majority of which is expected to be reclassified into earnings within the next twelve months.

Schlumberger is also exposed to changes in the fair value of assets and liabilities, including certain of its long-term debt, which are denominated in currencies other than the functional currency. Schlumberger uses foreign currency forward contracts and foreign currency options to hedge this exposure for certain currencies. The fair value of these contracts are recorded on the Consolidated Balance Sheet and changes in the fair value recognized in the Consolidated Statement of Income along with the change in fair value of the hedged item.

At December 31, 2011, contracts were outstanding for the US dollar equivalent of $6.9 billion in various foreign currencies, of which $3.9 billion relate to hedges of debt denominated in currencies other than the functional currency.

Commodity Price Risk

Schlumberger is exposed to the impact of market fluctuations in the price of certain commodities, such as metals and fuel. Schlumberger utilizes forward contracts to manage a small percentage of the price risk associated with forecasted metal purchases. The objective of these contracts is to reduce the variability of cash flows associated with the forecasted purchase of those commodities. These contracts do not qualify for hedge accounting treatment and therefore, changes in the fair value of the forward contracts are recorded directly to earnings.

At December 31, 2011, $27 million of commodity forward contracts were outstanding.

Interest Rate Risk

Schlumberger is subject to interest rate risk on its debt and its investment portfolio. Schlumberger maintains an interest rate risk management strategy that uses a mix of variable and fixed rate debt combined with its investment portfolio and interest rate swaps to mitigate the exposure to changes in interest rates.

During the third quarter of 2009, Schlumberger entered into interest rate swaps relating to two of its debt instruments. The first swap was for a notional amount of $450 million in order to hedge changes in the fair value of Schlumberger’s $450 million 3.00% Notes due 2013. Under the terms of this swap, Schlumberger receives interest at a fixed rate of 3.0% annually and will pay interest quarterly at a floating rate of three-month LIBOR plus a spread of 0.765%. This interest rate swap is designated as a fair value hedge of the underlying debt. This derivative instrument is marked to market with gains and losses recognized currently in income to offset the respective losses and gains recognized on changes in the fair value of the hedged debt. This results in no net gain or loss being recognized in the Consolidated Statement of Income.

The second swap was for a notional amount of $600 million in order to hedge a portion of the changes in fair value of Schlumberger’s $650 million 6.50% Notes due 2012. Under the terms of this swap agreement, Schlumberger received interest at a fixed rate of 6.50% semi-annually and paid interest semi-annually at a floating rate of one-month LIBOR plus a spread of 4.84%. During the third and fourth quarters of 2010, Schlumberger repurchased all of the outstanding $650 million 6.50% Notes due 2012. Accordingly, this interest rate swap, which had previously been designated as a fair value hedge of the underlying debt, was settled during the fourth quarter and resulted in Schlumberger receiving proceeds of approximately $10 million.

At December 31, 2011, Schlumberger had fixed rate debt aggregating approximately $7.5 billion and variable rate debt aggregating approximately $2.4 billion, after taking into account the effects of the interest rate swaps.

The fair values of outstanding derivative instruments are summarized as follows:


(Stated in millions)
	Fair Value of Derivatives				Consolidated Balance Sheet Classification
Derivative assets	Dec. 31, 2011		Dec. 31, 2010		Consolidated Balance Sheet Classification
Derivative designated as hedges:
Foreign exchange contracts		$2		$4	Other current assets
Foreign exchange contracts		4		37	Other Assets
Interest rate swaps		9		14	Other Assets

		15		55

Derivative not designated as hedges:
Commodity contracts		–		3	Other current assets
Foreign exchange contracts		8		9	Other current assets
Foreign exchange contracts		9		9	Other Assets

		17		21

		$32		$76

Derivative Liabilities
Derivative designated as hedges:
Foreign exchange contracts		$47		$9	Accounts payable and accrued liabilities
Foreign exchange contracts		130		77	Other Liabilities
Interest rate swaps		–		7	Accounts payable and accrued liabilities

		177		93

Derivative not designated as hedges:
Commodity contracts		3		–	Accounts payable and accrued liabilities
Foreign exchange contracts		9		14	Accounts payable and accrued liabilities

		12		14

		$189		$107

The fair value of all outstanding derivatives is determined using a model with inputs that are observable in the market or can be derived from or corroborated by observable data.

The effect of derivative instruments designated as fair value hedges and not designated as hedges on the Consolidated Statement of Income was as follows:


(Stated in millions)
	Gain (Loss) Recognized in Income
	2011			2010			2009		Consolidated Statement of Income Classifiaction
Derivatives designated as fair value hedges:
Foreign exchange contracts	$	–		$	(8	)	$	105	Cost of revenue - Oilfield Services
Interest rate swaps		9			22			6	Interest expense

	$	9		$	14		$	111

Derivatives not designated as hedges:
Foreign exchange contracts	$	(17	)	$	(13	)	$	32	Cost of revenue - Oilfield Services
Commodity contracts		(5	)		1			2	Cost of revenue - Oilfield Services

	$	(22	)	$	(12	)	$	34

The effect of derivative instruments in cash flow hedging relationships on income and Accumulated other comprehensive loss (AOCL) was as follows:


(Stated in millions)
	Gain (Loss) Reclassified from AOCL into Income
	2011			2010			2009			Consolidated Statement of Income Classification
Foreign exchange contracts	$	(25	)	$	(260	)	$	95		Cost of revenue - Oilfield Services
Foreign exchange contracts		17			(14	)		(15	)	Research & engineering

	$	(8	)	$	(274	)	$	80


	(Stated in millions)
	Gain (Loss) Recognized in AOCL
	2011		2010			2009
Foreign exchange contracts	$	79	$	(269	)	$	223

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Stockholders' Equity

12 Months Ended

Dec. 31, 2011

Equity [Abstract]

Stockholders' Equity

12. Stockholders’ Equity

Schlumberger is authorized to issue 4,500,000,000 shares of common stock, par value $0.01 per share, of which 1,333,775,406 and 1,361,171,428 shares were outstanding on December 31, 2011 and 2010, respectively. Schlumberger is also authorized to issue 200,000,000 shares of preferred stock, par value $0.01 per share, which may be issued in series with terms and conditions determined by the Board of Directors. No shares of preferred stock have been issued. Holders of common stock are entitled to one vote for each share of stock held.

Accumulated Other Comprehensive Loss consists of the following:


	(Stated in millions)
	2011			2010			2009
Currency translation adjustments	$	(993	)	$	(912	)	$	(886	)
Fair value of derivatives		(26	)		45			40
Pension and other postretirement benefit plans		(2,538	)		(1,901	)		(1,828	)


	$	(3,557	)	$	(2,768	)	$	(2,674	)

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

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-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
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-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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-Name Accounting Research Bulletin (ARB)
-Number 43
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-Article 5

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-Section E

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Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

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Stock Compensation Plans

12 Months Ended

Dec. 31, 2011

Stock Compensation Plans [Abstract]

Stock Compensation Plans

13. Stock Compensation Plans

Schlumberger has three types of stock-based compensation programs: stock options, a restricted stock and restricted stock unit program (collectively referred to as “restricted stock”) and a discounted stock purchase plan (“DSPP”).

Stock Options

Key employees are granted stock options under Schlumberger stock option plans. For all of the stock options granted, the exercise price equals the average of the high and low sales prices of Schlumberger stock on the date of grant; an option’s maximum term is ten years, and options generally vest in increments over four or five years.

The fair value of each stock option grant was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions and resulting weighted-average fair value per share:


	2011			2010			2009
Dividend yield		1.2	%		1.3	%		1.2	%
Expected volatility		37	%		35	%		34	%
Risk free interest rate		2.8	%		2.9	%		2.2	%
Expected option life in years		6.9			6.9			6.9
Weighted-average fair value per share	$	31.38		$	24.13		$	13.92

The following table summarizes information concerning options outstanding and options exercisable by five ranges of exercise prices as of December 31, 2011:


(Shares stated in thousands)
	Options Outstanding						Options Exercisable
			Weighted-
			average		Weighted-
			remaining		average				Weighted-
	Options		contractual life		exercise		Options		average
Exercise prices range	Outstanding		(in years)		price		Exercisable		exercise price
$19.04 - $32.46		2,764		0.99	$	27.35		2,764	$	27.35
$32.62 - $37.85		5,921		6.67	$	37.43		2,109	$	36.69
$39.08 - $55.69		6,116		5.00	$	52.71		4,929	$	53.45
$56.61 - $74.00		11,223		7.19	$	65.09		4,199	$	62.50
$83.89 - $110.78		14,003		8.02	$	86.08		2,885	$	89.48

		40,027		6.64	$	63.84		16,886	$	55.49

The weighted average remaining contractual life of stock options exercisable as of December 31, 2011 was 4.7 years.

The following table summarizes stock option activity during the years ended December 31, 2011, 2010 and 2009:


(Shares stated in thousands)
	2011					2010					2009
				Weighted-					Weighted-					Weighted-
				average					average					average
				exercise					exercise					exercise
	Shares			price		Shares			price		Shares			price
Outstanding at beginning of year		37,499		$	55.33		35,500		$	50.30		32,301		$	50.36
Granted		9,528		$	84.29		8,283		$	66.67		7,981		$	40.87
Assumed in Smith transaction		–		$	–		581		$	28.77		–		$	–
Exercised		(5,470	)	$	42.36		(5,962	)	$	37.60		(3,851	)	$	29.00
Forfeited		(1,530	)	$	58.82		(903	)	$	61.28		(931	)	$	58.82


Outstanding at year-end		40,027		$	63.84		37,499		$	55.33		35,500		$	50.30

The aggregate intrinsic value of stock options outstanding as of December 31, 2011 was approximately $428 million.

The aggregate intrinsic value of stock options exercisable as of December 31, 2011 was approximately $278 million.

The total intrinsic value of options exercised during the years ended December 31, 2011, 2010 and 2009, was $246 million, $188 million and $103 million, respectively.

Restricted Stock

Restricted stock awards generally vest at the end of three years. There have not been any grants to date that are subject to performance-based vesting.

The following table summarizes information about restricted stock transactions:


(Shares stated in thousands)
	2011					2010					2009
				Weighted					Weighted					Weighted
				Average					Average					Average
	Restricted			Grant Date		Restricted			Grant Date		Restricted			Grant Date
	Stock			Fair Value		Stock			Fair Value		Stock			Fair Value
Unvested at beginning of year		2,223		$	64.27		1,343		$	62.75		1,701		$	66.49
Granted		1,136			84.61		1,261			65.79		304			48.14
Vested		(767	)		67.36		(286	)		63.92		(580	)		65.15
Forfeited		(159	)		72.51		(95	)		64.16		(82	)		69.23


Unvested at end of year		2,433		$	72.25		2,223		$	64.27		1,343		$	62.75

Discounted Stock Purchase Plan

Under the terms of the DSPP, employees can choose to have a portion of their earnings withheld, subject to certain restrictions, to purchase Schlumberger common stock. The purchase price of the stock is 92.5% of the lower of the stock price at the beginning or end of the plan period at six-month intervals.

The fair value of the employees’ purchase rights under the DSPP was estimated using the Black-Scholes model with the following assumptions and resulting weighted average fair value per share:


	2011			2010			2009
Dividend yield		1.2	%		1.6	%		1.1	%
Expected volatility		28	%		36	%		44	%
Risk free interest rate		0.2	%		0.3	%		0.3	%
Weighted average fair value per share	$	12.83		$	10.30		$	9.76

Total Stock-based Compensation Expense

The following summarizes stock-based compensation expense recognized in income:


(Stated in millions)
	2011		2010		2009
Stock options	$	176	$	121	$	118
Restricted stock		60		44		32
DSPP		36		33		36


	$	272	$	198	$	186

At December 31, 2011, there was $527 million of total unrecognized compensation cost related to nonvested stock-based compensation arrangements of which $218 million is expected to be recognized in 2012, $152 million in 2013, $101 million in 2014, $53 million in 2015 and $3 million in 2016.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

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-Paragraph 2
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 4
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

Income Taxes

12 Months Ended

Dec. 31, 2011

Income Tax [Abstract]

Income Tax

14.

Income Taxes

Schlumberger operates in more than 100 jurisdictions, where statutory tax rates generally vary from 0% to 50%.

Income from continuing operations before taxes which were subject to United States and non-United States income taxes for each of the three years ended December 31, was as follows:


	(Stated in millions)
	2011		2010		2009
United States	$	2,325	$	638	$	86
Outside United States		4,013		4,518		3,848


	$	6,338	$	5,156	$	3,934

Schlumberger recorded $225 million of pretax charges in 2011 ($106 million in the US and $119 million outside the US). Schlumberger recorded $621 million of net pretax credits in 2010 ($226 million of net charges in the US and $847 million of net credits outside the US) and $238 million of pretax charges in 2009 ($73 million in the US and $165 million outside the US). These charges and credits are included in the table above and are more fully described in Note 3 – Charges and Credits.

The components of net deferred tax assets (liabilities) were as follows:


	(Stated in millions)
	2011			2010
Postretirement benefits	$	440		$	327
Intangible assets		(1,498	)		(1,674	)
Investments in non-US subsidiaries		(349	)		(353	)
Other, net		132			115


	$	(1,275	)	$	(1,585	)

The above deferred tax balances at December 31, 2011 and 2010 were net of valuation allowances relating to net operating losses in certain countries of $239 million and $263 million, respectively.

The components of Taxes on income were as follows:


(Stated in millions)
	2011			2010			2009
Current:
United States – Federal	$	842		$	76		$	(191	)
United States – State		45			14			(6	)
Outside United States		693			909			594


	$	1,580		$	999		$	397

Deferred:
United States – Federal	$	(80	)	$	183		$	247
United States – State		(7	)		2			13
Outside United States		73			(281	)		86
Valuation allowance		(21	)		(13	)		27


	$	(35	)	$	(109	)	$	373


Consolidated taxes on income	$	1,545		$	890		$	770

A reconciliation of the United States statutory federal tax rate (35%) to the consolidated effective tax rate is:


	2011			2010			2009
US statutory federal rate		35	%		35	%		35	%
Non-US income taxed at different rates		(10	)		(14	)		(16	)
Charges and credit (See Note 3)		—			(3	)		1
Other		(1	)		(1	)		—


Effective income tax rate		24	%		17	%		20	%

Schlumberger conducts business in more than 100 tax jurisdictions, a number of which have tax laws that are not fully defined and are evolving. Schlumberger’s tax filings are subject to regular audit by the tax authorities. Tax liabilities are recorded based on estimates of additional taxes which will be due upon the conclusion of these audits.

A reconciliation of the beginning and ending amount of liabilities associated with uncertain tax positions for the years ended December 31, 2011, 2010 and 2009 is as follows:


	(Stated in millions)
	2011			2010			2009
Balance at beginning of year	$	1,338		$	1,026		$	877
Additions based on tax positions related to the current year		153			190			178
Additions for tax positions of prior years		49			8			36
Additions related to acquisitions		48			288			—
Impact of changes in exchange rates		(18	)		(3	)		39
Settlements with tax authorities		(77	)		(36	)		(16	)
Reductions for tax positions of prior years		(102	)		(99	)		(68	)
Reductions due to the lapse of the applicable statute of limitations		(38	)		(36	)		(20	)


Balance at end of year	$	1,353		$	1,338		$	1,026

The amounts above exclude accrued interest and penalties of $225 million, $210 million and $168 million at December 31, 2011, 2010 and 2009 respectively.

Schlumberger classifies interest and penalties relating to uncertain tax positions within Taxes on income in the Consolidated Statement of Income. During 2011, 2010 and 2009, Schlumberger recognized approximately $15 million, $42 million and $32 million in interest and penalties, respectively.

The following table summarizes the tax years that are either currently under audit or remain open and subject to examination by the tax authorities in the most significant jurisdictions in which Schlumberger operates:


Brazil			2005 –2011
Canada			2004 –2011
Mexico			2006 –2011
Norway			2003 – 2011
Russia			2008 – 2011
Saudi Arabia			2001 – 2011
United Kingdom			2009 – 2011
United States			2005 – 2011

In certain of the jurisdictions noted above, Schlumberger operates through more than one legal entity, each of which has different open years subject to examination. The table above presents the open years subject to examination for the most material of the legal entities in each jurisdiction. Additionally, it is important to note that tax years are technically not closed until the statute of limitations in each jurisdiction expires. In the jurisdictions noted above, the statute of limitations can extend beyond the open years subject to examination.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Contingencies and Leases and Lease Commitments [Abstract]

Leases and Lease Commitments

12 Months Ended

Dec. 31, 2011

Leases and Lease Commitments

15. Leases and Lease Commitments

Total rental expense was $1.6 billion in 2011, $1.2 billion in 2010, and $1.0 billion in 2009. Future minimum rental commitments under noncancelable operating leases for each of the next five years are as follows:


(Stated in millions)
2012	$	313
2013		239
2014		181
2015		150
2016		105
Thereafter		441

	$	1,429

Contingencies

12 Months Ended

Dec. 31, 2011

Contingencies and Leases and Lease Commitments [Abstract]

Contingencies

16. Contingencies

In 2007, Schlumberger received an inquiry from the United States Department of Justice (“DOJ”) related to the DOJ’s investigation of whether certain freight forwarding and customs clearance services of Panalpina, Inc., and other companies provided to oil and oilfield service companies, including Schlumberger, violated the Foreign Corrupt Practices Act. Schlumberger is cooperating with the governmental authorities.

In 2009, Schlumberger learned that United States officials began a grand jury investigation and an associated regulatory inquiry, both related to certain Schlumberger operations in specified countries that are subject to United States trade and economic sanctions. Also in 2009, prior to being acquired by Schlumberger, Smith received an administrative subpoena with respect to its historical business practices in certain countries that are subject to United States trade and economic sanctions. Schlumberger is cooperating with the governmental authorities.

On April 20, 2010, a fire and explosion occurred onboard the semisubmersible drilling rig Deepwater Horizon, owned by Transocean Ltd. and under contract to a subsidiary of BP plc. Pursuant to a contract between M-I SWACO and BP, M-I SWACO provided certain services under the direction of BP. A number of legal actions, certain of which name an M-I SWACO entity as a defendant, have been filed in connection with the Deepwater Horizon incident, and additional legal actions may be filed in the future. Based on information currently known, the amount of any potential loss attributable to M-I SWACO with respect to potential liabilities related to the incident would not be material to Schlumberger’s consolidated financial statements.

Schlumberger and its subsidiaries are party to various other legal proceedings from time to time. A liability is accrued when a loss is both probable and can be reasonably estimated. Management believes that the probability of a material loss is remote. However, litigation is inherently uncertain and it is not possible to predict the ultimate disposition of these proceedings.

The entire disclosure for commitments and contingencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Segment Information

12 Months Ended

Dec. 31, 2011

Segment Information [Abstract]

Segment Information

17. Segment Information

Schlumberger previously reported its results on the basis of five business segments – Schlumberger Oilfield Services, WesternGeco, M-I SWACO, Smith Oilfield and Distribution and by geographical areas within Schlumberger Oilfield Services. As a result of the acquisitions of Smith and Geoservices, the range of Schlumberger’s activities comprising exploration and production services is so broad that it has changed the primary way in which it allocates resources and assesses performance. Consequently, effective with the first quarter of 2011, Schlumberger changed its primary reporting to product group segments (the “Groups”).

The Groups are as follows:

—

Reservoir Characterization Group – Consists of the principal technologies involved in finding and defining hydrocarbon deposits. These include WesternGeco, Wireline, Testing Services, Schlumberger Information Services and Data & Consulting Services.

—

Drilling Group – Consists of the principal technologies involved in the drilling and positioning of oil and gas wells and is comprised of Bits & Advanced Technologies, M-I SWACO, Geoservices, Drilling & Measurements, PathFinder, Drilling Tools & Remedial, Dynamic Pressure Management and Integrated Project Management well construction projects.

—

Reservoir Production Group – Consists of the principal technologies involved in the lifetime production of oil and gas reservoirs and includes Well Services, Completions, Artificial Lift, Well Intervention, Subsea, Water Services, Carbon Services and the Schlumberger Production Management field production projects.

The Groups are collectively referred to as “Oilfield Services”. Additionally, Schlumberger also reports the Distribution business, acquired in the Smith transaction, as a separate segment.

All prior period segment disclosures have been recast to reflect the new segments.

Financial information for the years ended December 31, 2011, 2010 and 2009, by segment, is as follows:


									(Stated in millions)
	2011
	Revenue			Income before taxes			Assets		Depn. & Amortn.		Capital Expenditures
*OILFIELD SERVICES*
Reservoir Characterization	$	9,929		$	2,449		$	7,621	$	1,285	$	1,057
Drilling		14,248			2,275			9,268		1,026		1,460
Reservoir Production		12,748			2,616			7,834		598		1,343
Eliminations & other ⁽¹⁾		34			(35	)		1,956		163		148

		36,959			7,305			26,679		3,072		4,008

*DISTRIBUTION*		2,621			103			939		6		8
Eliminations		(40	)		—

		2,581			103
Goodwill and intangible assets								19,036
All other assets								2,198
Corporate ⁽²⁾					(592	)		6,349		203
Interest income ⁽³⁾					37
Interest expense ⁽⁴⁾					(290	)
Charges & credits ⁽⁵⁾					(225	)

	$	39,540		$	6,338		$	55,201	$	3,281	$	4,016


								(Stated in millions)
	2010
	Revenue		Income before taxes			Assets		Depn. & Amortn.		Capital Expenditures
*OILFIELD SERVICES*
Reservoir Characterization	$	9,321	$	2,321		$	7,338	$	1,246	$	885
Drilling		8,230		1,334			8,490		756		968
Reservoir Production		9,053		1,368			6,119		536		824
Eliminations & other ⁽¹⁾		69		48			1,801		142		234

		26,673		5,071			23,748		2,680		2,911

*DISTRIBUTION*		774		29			780		2		2
Goodwill and intangible assets							19,114
All other assets							1,580
Corporate ⁽²⁾				(405	)		6,545		77		1
Interest income ⁽³⁾				43
Interest expense ⁽⁴⁾				(202	)
Charges & credits ⁽⁵⁾				620

	$	27,447	$	5,156		$	51,767	$	2,759	$	2,914


								(Stated in millions)
	2009
	Revenue		Income before taxes			Assets		Depn. & Amortn.		Capital Expenditures
*OILFIELD SERVICES*
Reservoir Characterization	$	9,502	$	2,559		$	7,090	$	1,221	$	1,085
Drilling		5,881		1,245			3,628		620		470
Reservoir Production		7,282		780			5,006		503		632
Eliminations & other ⁽¹⁾		37		51			2,117		121		203

		22,702		4,635			17,841		2,465		2,390

Goodwill and intangible assets							6,091
All other assets							1,873
Corporate ⁽²⁾				(327	)		7,660		11		5
Interest income ⁽³⁾				52
Interest expense ⁽⁴⁾				(188	)
Charges & credits ⁽⁵⁾				(238	)

	$	22,702	$	3,934		$	33,465	$	2,476	$	2,395

(1)	Includes certain headquarter administrative costs which are not allocated to the segments, and certain other operations and other cost and income items maintained at the Oilfield Services level.

(2)

Comprised principally of corporate expenses not allocated to the segments, interest on postretirement medical benefits, stock-based compensation costs, amortization expense associated with intangible assets recorded as a result of the acquisition of Smith and certain other nonoperating items. Corporate assets consist of cash, short-term investments, fixed income investments, held to maturity and investments in affiliates.

(3)	Interest income excludes amounts which are included in the segments’ income (2011—$3 million: 2010—$7 million; 2009—$10 million).

(4)	Interest expense excludes amounts which are included in the segments’ income (2011—$8 million; 2010—$5 million; 2009—$33 million).

(5)	See Note 3 – Charges and Credits.

Segment assets consist of receivables, inventories, fixed assets and multiclient seismic data.

Depreciation & Amortization includes multiclient seismic data costs.

Revenue for the years ended December 31, 2011, 2010 and 2009, by geographic area is as follows:


			(Stated in millions)
	2011		2010		2009
*OILFIELD SERVICES*
North America	$	12,273	$	6,729	$	4,217
Latin America		6,453		4,985		4,552
Europe/CIS/Africa		9,761		8,024		7,737
Middle East & Asia		8,065		6,650		5,961
Eliminations & other		407		285		235

		36,959		26,673		22,702

DISTRIBUTION		2,581		774		—

	$	39,540	$	27,447	$	22,702

Revenue is based on the location of where services are provided. Approximately 99% and 97% of Distribution’s revenue in 2011 and 2010, respectively, was generated in North America.

During each of the three years ended December 31, 2011, 2010 and 2009, no single customer exceeded 10% of consolidated revenue.

Schlumberger did not have revenue from third-party customers in its country of domicile during the last three years. Revenue in the United States in 2011, 2010 and 2009 was $12.7 billion, $6.5 billion and $3.7 billion, respectively.

Fixed Assets less accumulated depreciation by geographic area are as follows:


(Stated in millions)
		2011		2010		2009

*OILFIELD SERVICES*
North America	$	4,220	$	3,624	$	2,229
Latin America		1,472		1,274		995
Europe/CIS/Africa		3,324		3,310		2,763
Middle East & Asia		2,233		2,004		1,797
Unallocated ⁽¹⁾		1,744		1,859		1,876

	$	12,993	$	12,071	$	9,660

⁽¹⁾	Represents seismic vessels, including the related on-board equipment, which frequently transition between geographic areas.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Pension and Other Benefit Plans [Abstract]

Pension and Other Benefit Plans

12 Months Ended

Dec. 31, 2011

Pension and Other Benefit Plans

18.

Pension and Other Benefit Plans

Pension Plans

Schlumberger sponsors several defined benefit pension plans that cover substantially all US employees hired prior to October 1, 2004. The benefits are based on years of service and compensation, on a career-average pay basis.

In addition to the United States defined benefit pension plans, Schlumberger sponsors several other international defined benefit pension plans. The most significant of these international plans are the International Staff Pension Plan and the UK pension plan (collectively, the “International plans”). The International Staff Pension Plan covers certain international employees and is based on years of service and compensation on a career-average pay basis. The UK plan covers employees hired prior to April 1, 1999, and is based on years of service and compensation, on a final salary basis.

The weighted-average assumed discount rate, compensation increases and the expected long-term rate of return on plan assets used to determine the net pension cost for the US and International plans were as follows:


	US									International
	2011			2010			2009			2011			2010			2009
Discount rate		5.50	%		6.00	%		6.94	%		5.47	%		5.89	%		6.81	%
Compensation increases		4.00	%		4.00	%		4.00	%		4.91	%		4.93	%		4.93	%
Return on plan assets		7.50	%		8.50	%		8.50	%		7.50	%		8.00	%		8.00	%

Net pension cost for 2011, 2010 and 2009 included the following components:


(Stated in millions)
	US									International
	2011			2010			2009			2011			2010			2009
Service cost—benefits earned during the period	$	59		$	56		$	52		$	64		$	51		$	67
Interest cost on projected benefit obligation		150			142			143			226			208			189
Expected return on plan assets		(170	)		(191	)		(166	)		(279	)		(228	)		(181	)
Amortization of net loss		90			60			29			31			19			—
Amortization of prior service cost		12			4			5			120			113			117

		141			71			63			162			163			192
Curtailment charge		—			—			32			—			—			98

	$	141		$	71		$	95		$	162		$	163		$	290

During 2009, due to the actions taken by Schlumberger to reduce its global workforce (See Note 3 – Charges and Credits), Schlumberger experienced a significant reduction in the expected aggregate years of future service of its employees in certain of its pension plans and its postretirement medical plan. Accordingly, Schlumberger recorded a curtailment charge of $136 million during the second quarter of 2009 ($130 million relating to the pension plans and $6 million relating to the postretirement medical plan). The curtailment charge includes recognition of the change in benefit obligations as well as a portion of the previously unrecognized prior service costs, reflecting the reduction in expected future service for the impacted plans. As a result of the curtailment, Schlumberger performed a remeasurement of the impacted plans using a discount rate of 7.25%.

The weighted-average assumed discount rate and compensation increases used to determine the projected benefit obligations for the US and International plans were as follows:


	US						International
	2011			2010			2011			2010
Discount rate		5.00	%		5.50	%		4.95	%		5.47	%
Compensation increases		4.00	%		4.00	%		4.91	%		4.91	%

The changes in the projected benefit obligation, plan assets and funded status of the plans were as follows:


							(Stated in millions)
	US						International
	2011			2010			2011			2010
*Change in Projected Benefit Obligations*
Projected benefit obligation at beginning of year	$	2,769		$	2,439		$	4,088		$	3,518
Service cost		59			56			64			51
Interest cost		150			142			226			208
Contributions by plan participants		–			–			102			76
Actuarial losses		225			172			321			310
Currency effect		–			–			(8	)		(28	)
Benefits paid		(130	)		(122	)		(127	)		(121	)
Plan amendments		–			82			–			74

Projected benefit obligation at end of year	$	3,073		$	2,769		$	4,666		$	4,088

*Change in Plan Assets*
Plan assets at fair value at beginning of year	$	2,635		$	2,254		$	3,764		$	2,976
Actual return on plan assets		78			316			–			426
Currency effect		–			–			(6	)		(26	)
Company contributions		72			187			364			433
Contributions by plan participants		–			–			102			76
Benefits paid		(130	)		(122	)		(127	)		(121	)

Plan assets at fair value at end of year	$	2,655		$	2,635		$	4,097		$	3,764

*Unfunded Liability*	$	(418	)	$	(134	)	$	(569	)	$	(324	)

*Amounts Recognized in Balance Sheet*
Postretirement Benefits	$	(418	)	$	(134	)	$	(569	)	$	(367	)
Other Assets		–			–			–			43

	$	(418	)	$	(134	)	$	(569	)	$	(324	)

*Amounts Recognized in Accumulated Other Comprehensive Loss*
Actuarial losses	$	1,048		$	819		$	1,002		$	447
Prior service cost		101			114			729			840

	$	1,149		$	933		$	1,731		$	1,287

Accumulated benefit obligation	$	2,861		$	2,568		$	4,336		$	3,785

The unfunded liability represents the difference between the plan assets and the projected benefit obligation (“PBO”). The PBO represents the actuarial present value of benefits based on employee service and compensation and includes an assumption about future compensation levels. The accumulated benefit obligation represents the actuarial present value of benefits based on employee service and compensation, but does not include an assumption about future compensation levels.

The weighted-average allocation of plan assets and the target allocation by asset category are as follows:


	US									International
	Target			2011			2010			Target			2011			2010
Equity securities		45 – 50	%		47	%		52	%		50 – 70	%		51	%		61	%
Debt securities		33 –43			39			40			25 – 35			38			31
Cash and cash equivalents		0 – 2			6			2			0 – 2			4			3
Alternative investments		0 – 10			8			6			0 – 20			7			5

		100	%		100	%		100	%		100	%		100	%		100	%

Schlumberger’s investment policy includes various guidelines and procedures designed to ensure that assets are prudently invested in a manner necessary to meet the future benefit obligation of the pension plans. The policy does not permit the direct investment of plan assets in any Schlumberger security. Schlumberger’s investment horizon is long-term and accordingly the target asset allocations encompass a strategic, long-term perspective of capital markets, expected risk and return behavior and perceived future economic conditions. The key investment principles of diversification, assessment of risk and targeting the optimal expected returns for given levels of risk are applied. The target asset allocation is reviewed periodically and is determined based on a long-term projection of capital market outcomes, inflation rates, fixed income yields, returns, volatilities and correlation relationships. The inclusion of any given asset class in the target asset allocation is considered in relation to its impact on the overall risk/return characteristics as well as its impact on the overall investment return. As part of its strategy, Schlumberger may utilize certain derivative instruments, such as options, futures, swaps and forwards, within the plans to manage risks (currency, interest rate, etc.), as a substitute for physical securities or to obtain exposure to different markets.

Asset performance is monitored frequently with an overall expectation that plan assets will meet or exceed the weighted index of its target asset allocation and component benchmark over rolling five-year periods.

The expected long-term rate of return on assets assumptions reflect the average rate of earnings expected on funds invested or to be invested. The assumptions have been determined by reflecting expectations regarding future rates of return for the portfolio considering the asset allocation and related historical rates of return. The appropriateness of the assumptions is reviewed annually.

The fair value of Schlumberger’s pension plan assets at December 31, 2011 and 2010, by asset category, are presented below and were determined based on valuation techniques categorized as follows:

—

Level One: The use of quoted prices in active markets for identical instruments.

—

Level Two: The use of quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active or other inputs that are observable in the market or can be corroborated by observable market data.

—

Level Three: The use of significantly unobservable inputs that typically require the use of management’s estimates of assumptions that market participants would use in pricing.


(Stated in millions)
	US Plan Assets
	2011								2010
	Total		Level One		Level Two		Level Three		Total		Level One		Level Two		Level Three
Asset Category:
Cash and Cash Equivalents	$	147	$	39	$	108	$	–	$	67	$	35	$	32	$	–
Equity Securities:
US^(a)		806		471		335				885		635		250
International^(b)		453		369		84				473		370		103
Debt Securities:
Corporate bonds^(c)		340				340				220				220
Government and government-related debt securities^(d)		545		146		399				554		148		406
Government agency collateralized mortgage obligations and mortgage backed securities^(e)		96				96				201				201
Other collateralized mortgage obligations and mortgage-backed securities^(f)		58				58				67				67
Alternative Investments:
Private equity^(g)		160						160		128						128
Real estate^(h)		50						50		40						40

Total	$	2,655	$	1,025	$	1,420	$	210	$	2,635	$	1,188	$	1,279	$	168

(Stated in millions)
	International Plan Assets
	2011								2010
	Total		Level One		Level Two		Level Three		Total		Level One		Level Two		Level Three
Asset Catergory:
Cash and Cash Equivalents	$	152	$	152	$	–	$	–	$	106	$	106	$	–	$	–
Equity Securities:
US^(a)		1,170		1,018		152				1,268		1,117		151
International^(b)		937		651		286				1,031		1,031
Debt Securities:
Corporate bonds^(c)		399				399				289		15		274
Government and government-related^(d)		808		551		257				693		365		328
Government agency collateralized mortgage obligations and mortgage backed securities^(e)		268		190		78				125		44		81
Other collateralized mortgage obligations and mortgage-backed securities^(f)		93				93				74				74
Alternative Investments:
Private equity^(g)		150						150		114						114
Real estate^(h)		62						62		64						64
Other		58						58

Total	$	4,097	$	2,562	$	1,265	$	270	$	3,764	$	2,678	$	908	$	178

(a)	US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.

(b)

International equities are invested in companies that are traded on exchanges outside the US and are well diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.

(c)	Corporate bonds consist primarily of investment grade bonds from diversified industries.

(d)	Government and government-related debt securities are comprised primarily of inflation protected US treasuries and, to a lesser extent, other government-related securities.

(e)

Government agency collateralized mortgage obligations and mortgage backed-securities are debt obligations that represent claims to the cash flows from pools of mortgage loans which are purchased from banks, mortgage companies, and other originators and then assembled into pools by governmental and quasi-governmental entities.

(f)	Other collateralized mortgage obligations and mortgage-backed securities are debt obligations that represent claims to the cash flows from pools of mortgage loans which are purchased from banks, mortgage companies, and other originators and then assembled into pools by private entities.

(g)	Private equity includes investments in several fund of funds limited partnerships.

(h)	Real estate primarily includes investments in real estate limited partnerships, concentrated in commercial real estate.

The funding policy is to annually contribute amounts that are based upon a number of factors including the actuarial accrued liability, amounts that are deductible for income tax purposes, legal funding requirements and available cash flow. Schlumberger currently anticipates contributing approximately $600 million to its postretirement benefit plans in 2012, subject to market and business conditions.

Postretirement Benefits Other than Pensions

Schlumberger provides certain health care benefits to former US employees who have retired.

The actuarial assumptions used to determine the accumulated postretirement benefit obligation and net periodic benefit cost for the US postretirement medical plan were as follows:


	Benefit Obligation at December 31,						Net Periodic Benefit Cost for the year
	2011			2010			2011			2010			2009
Discount rate		5.00	%		5.50	%		5.50	%		6.00	%		6.94	%
Return on plan assets		–			–			7.00	%		8.00	%		8.00	%
Current medical cost trend rate		8.00	%		8.00	%		8.00	%		8.00	%		8.00	%
Ultimate medical cost trend rate		5.00	%		5.00	%		5.00	%		5.00	%		5.00	%
Year that the rate reaches theultimate trend rate		2018			2017			2017			2016			2015

The net periodic benefit cost for the US postretirement medical plan included the following components:


(Stated in millions)
	2011			2010			2009
Service cost – benefits earned during the period	$	24		$	23		$	19
Interest cost on projected benefit obligation		57			58			56
Expected return on plan assets		(20	)		(6	)		(2	)
Amortization of prior service credit		(12	)		(21	)		(25	)
Amortization of net loss		13			11			3

		62			65			51
Curtailment charge		–			–			6

	$	62		$	65		$	57

The changes in the accumulated postretirement benefit obligation, plan assets and funded status were as follows:


(Stated in millions)
	2011			2010
*Change in Accumulated Postretirement Benefit Obligation*
Benefit obligation at beginning of year	$	1,051		$	991
Service cost		24			23
Interest cost		57			58
Contributions by plan participants		6			4
Actuarial losses		90			8
Benefits paid		(40	)		(33	)

Benefit obligation at end of year	$	1,188		$	1,051

*Change in Plan Assets*
Plan assets at fair value at beginning of year	$	290		$	58
Company contributions		165			248
Contributions by plan participants		6			5
Benefits paid		(40	)		(33	)
Actual return on plan assets		22			12

Plan assets at fair value at end of year	$	443		$	290

*Unfunded Liability*	$	(745	)	$	(761	)

*Amounts Recognized in Accumulated*
*Other Comprehensive Loss*
Actuarial losses	$	286		$	212
Prior service cost		(24	)		(35	)

	$	262		$	177

The unfunded liability is included in Postretirement Benefits in the Consolidated Balance Sheet.

The assets of the US postretirement medical plan are invested 60% in US equity securities and 40% in government and government-related debt securities. The fair value of these assets were determined based on quoted prices in active markets for identical instruments.

Assumed health care cost trend rates have a significant effect on the amounts reported for the US postretirement medical plan. A one percentage point change in assumed health care cost trend rates would have the following effects:


(Stated in millions)
	One percentage point increase		One percentage point decrease
Effect on total service and interest cost components	$	16		$	(13	)
Effect on accumulated postretirement benefit obligation	$	196		$	(160	)

Other Information

The expected benefits to be paid under the US and International pension plans as well as the postretirement medical plan (which is disclosed net of the annual Medicare Part D subsidy, which ranges from $3 million to $6 million per year) were as follows:


(Stated in millions)
	Pension Benefits				Postretirement Medical Plan
	US		International		Postretirement Medical Plan
2012	$	135	$	156	$	45
2013		139		168		49
2014		143		183		52
2015		149		197		55
2016		155		215		59
2017- 2021		911		1,250		352

Included in Accumulated other comprehensive loss at December 31, 2011 are non-cash pretax charges which have not yet been recognized in net periodic benefit cost. The estimated amounts that will be amortized from the estimated portion of each component of Accumulated other comprehensive loss which is expected to be recognized as a component of net periodic benefit cost during the year-ending December 31, 2012 are as follows:


(Stated in millions)
	Pension Plans		Postretirement Medical Plan
Net actuarial losses	$	104	$	18
Prior service cost (credit)	$	132	$	(8	)

In addition to providing defined pension benefits and a postretirement medical plan, Schlumberger and its subsidiaries have other deferred benefit programs, primarily profit sharing and defined contribution pension plans. Expenses for these programs were $582 million, $403 million and $418 million in 2011, 2010 and 2009, respectively.

The entire disclosure for pension and other postretirement benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number 132R
-Paragraph 5
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-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Business Description and Supplementary Information [Abstract]

Supplementary Information

12 Months Ended

Dec. 31, 2011

Supplementary Information

19. Supplementary Information

Cash paid for interest and income taxes was as follows:


(Stated in millions)
	2011		2010		2009
Interest	$	294	$	234	$	249
Income taxes	$	1,836	$	571	$	665

Accounts payable and accrued liabilities are summarized as follows:


(Stated in millions)
	2011		2010
Payroll, vacation and employee benefits	$	1,597	$	1,414
Trade		3,389		2,649
Other		2,593		2,425

	$	7,579	$	6,488

Interest and other income, net includes the following:


(Stated in millions)
	2011		2010		2009
Interest income	$	40	$	50	$	61
Equity in net earnings of affiliated companies:
M-I SWACO		–		78		131
Others		89		86		78
Other		–		–		3

	$	129	$	214	$	273

Allowance for doubtful accounts is as follows:


(Stated in millions)
	2011			2010			2009
Balance at beginning of year	$	185		$	160		$	133
Provision		37			38			54
Amounts written off		(45	)		(13	)		(27	)

Balance at end of year	$	177		$	185		$	160

Discontinued Operations

During the second quarter of 2011, Schlumberger completed the divestiture of its Global Connectivity Services business for approximately $385 million in cash. An after-tax gain of $220 million was recognized in connection with this transaction, and is classified in Income (loss) from discontinued operations in the Consolidated Statement of Income. The historical results of this business were not significant to Schlumberger’s consolidated financial statements and, as such, have not been reclassified to discontinued operations.

During the fourth quarter of 2009, Schlumberger recorded a net $22 million charge related to the resolution of a customs assessment pertaining to its former offshore contract drilling business, as well as the resolution of certain contingencies associated with other previously disposed of businesses. This amount is included in Income (loss) from discontinued operations in the Consolidated Statement of Income.

Summary of Accounting Policies (Policies)	12 Months Ended
Summary of Accounting Policies (Policies)	Dec. 31, 2011
Summary of Accounting Policies [Abstract]
Principles of Consolidation	*Principles of Consolidation* The accompanying Consolidated Financial Statements include the accounts of Schlumberger, its wholly-owned subsidiaries, and subsidiaries over which it exercises a controlling financial interest. All significant intercompany transactions and balances have been eliminated. Investments in entities in which Schlumberger does not have a controlling financial interest, but over which it has significant influence are accounted for using the equity method. Schlumberger’s share of the after-tax earnings of equity method investees is included in Interest and other income, net. Investments in which Schlumberger does not have the ability to exercise significant influence are accounted for using the cost method. Both equity and cost method investments are classified in Investments in Affiliated Companies.
Reclassifications	*Reclassifications* Certain prior year items have been reclassified to conform to the current year presentation.
Use of Estimates	*Use of Estimates* The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. On an on-going basis, Schlumberger evaluates its estimates, including those related to collectibility of accounts receivable; valuation of inventories and investments; recoverability of goodwill, intangible assets and investments in affiliates; income taxes; multiclient seismic data; contingencies and actuarial assumptions for employee benefit plans. Schlumberger bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
Revenue Recognition	*Revenue Recognition* Schlumberger recognizes revenue based upon purchase orders, contracts or other persuasive evidence of an arrangement with the customer that include fixed or determinable prices provided that collectibility is reasonably assured. Revenue is recognized for services when they are rendered. Revenue is recognized for products upon delivery, when the customer assumes the risks and rewards of ownership. Certain products may be provided on a consigned basis in which case revenue is recognized when the products are consumed provided that all other revenue recognition criteria have been met. Revenue from seismic contract services performed on a dayrate basis is recognized as the service is performed. Revenue from other services, including pre-funded multiclient surveys, is recognized as the seismic data is acquired and/or processed on a proportionate basis as work is performed. This method requires revenue to be recognized based upon quantifiable measures of progress, such as square kilometers acquired. Multiclient data surveys are licensed or sold to customers on a non-transferable basis. Revenue from sales of completed multiclient data surveys is recognized upon obtaining a signed licensing agreement and providing customers with access to such data. Revenue is occasionally generated from contractual arrangements that include multiple deliverables. Revenue from these arrangements is recognized as each item is delivered based on their relative fair value and when the delivered items have stand-alone value to the customer. Revenue derived from the sale of licenses of Schlumberger software may include installation, maintenance, consulting and training services. If services are not essential to the functionality of the software, the revenue for each element of the contract is recognized separately based on its respective vendor specific objective evidence of fair value when all of the following conditions are met: a signed contract is obtained, delivery has occurred, the fee is fixed or determinable and collectibility is probable.
Translation of Non-United States Currencies	*Translation of Non-United States Currencies* The functional currency of Schlumberger is primarily the US dollar. Assets and liabilities recorded in functional currencies other than US dollars are translated at period end exchange rates. The resulting adjustments are charged or credited directly to the Equity section of the Consolidated Balance Sheet. Revenue and expenses are translated at the weighted-average exchange rates for the period. Realized and unrealized transaction gains and losses are included in income in the period in which they occur. Transaction losses of $25 million and $27 million, net of hedging activities, were recognized in 2011 and 2010, respectively. Transaction gains of $73 million, net of hedging activities, were recognized during 2009.
Investments	*Investments* The Consolidated Balance Sheet reflects the Schlumberger investment portfolio separated between current and long term, based on maturity. Both Short-term investments and Fixed Income Investments, held to maturity are comprised primarily of money market funds, eurodollar time deposits, certificates of deposit, commercial paper, euro notes and Eurobonds, and are substantially denominated in US dollars. Under normal circumstances it is the intent of Schlumberger to hold the investments until maturity, with the exception of investments that are considered trading (December 31, 2011—$190 million; December 31, 2010—$189 million). Short-term investments that are designated as trading are stated at fair value, which is estimated using quoted market prices for those or similar investments. All other investments are stated at cost plus accrued interest, which approximates market. The unrealized gains/losses on investments designated as trading were not significant at both December 31, 2011 and 2010. For purposes of the Consolidated Statement of Cash Flows, Schlumberger does not consider short-term investments to be cash equivalents. Fixed Income Investments, held to maturity at December 31, 2011 of $256 million mature as follows: $80 million in 2013, $166 million in 2014 and $10 million in 2015.
Inventories	*Inventories* Inventories are stated at average cost or at market, whichever is lower. Costs included in Inventories consist of materials, direct labor and manufacturing overhead.
Fixed Assets and Depreciation	*Fixed Assets and Depreciation* Fixed assets are stated at cost less accumulated depreciation, which is provided for by charges to income over the estimated useful lives of the assets using the straight-line method. Fixed assets include the manufacturing cost of oilfield technical equipment manufactured or assembled by subsidiaries of Schlumberger. Expenditures for replacements and improvements are capitalized. Maintenance and repairs are charged to operating expenses as incurred. Upon sale or other disposition, the applicable amounts of asset cost and accumulated depreciation are removed from the balance sheet and the net amount, less proceeds from disposal, is charged or credited to income.
Multiclient Seismic Data	*Multiclient Seismic Data* The multiclient library consists of completed and in-process seismic surveys that are licensed on a nonexclusive basis. Multiclient surveys are primarily generated utilizing Schlumberger resources. Schlumberger capitalizes costs directly incurred in acquiring and processing the multiclient seismic data. Such costs are charged to Cost of revenue – Oilfield Services based on the percentage of the total costs to the estimated total revenue that Schlumberger expects to receive from the sales of such data. However, under no circumstance will an individual survey carry a net book value greater than a 4-year, straight-line amortized value.
Goodwill, Other Intangibles and Long-lived Assets	*Goodwill, Other Intangibles and Long-lived Assets* Schlumberger records the excess of purchase price over the fair value of the tangible and identifiable intangible assets acquired as goodwill. The goodwill relating to each of Schlumberger’s reporting units is tested for impairment annually as well as when an event, or change in circumstances, indicates an impairment may have occurred. Under generally accepted accounting principles, Schlumberger has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of one of its reporting units is greater than its carrying amount. If, after assessing the totality of events or circumstances, Schlumberger determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then there is no need to perform any further testing. However, if Schlumberger concludes otherwise, then it is required to perform the first step of a two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. If the fair value of the reporting unit is less than its carrying value, an impairment loss is recorded to the extent that the implied fair value of the goodwill of the reporting unit is less than its carrying value. Schlumberger has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test. For purposes of performing the impairment test for goodwill, Schlumberger’s four reporting units are the three Groups comprising Oilfield Services: Reservoir Characterization, Drilling and Reservoir Production, as well as the Distribution business segment. Schlumberger elected to perform the qualitative assessment described above for purposes of its annual goodwill impairment test. Based on this assessment, Schlumberger concluded that it was more likely than not that the fair value of each of its reporting units was greater than its carrying amount. Accordingly, no further testing was required. Long-lived assets, including fixed assets and intangible assets, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. In reviewing for impairment, the carrying value of such assets is compared to the estimated undiscounted future cash flows expected from the use of the assets and their eventual disposition. If such cash flows are not sufficient to support the asset’s recorded value, an impairment charge is recognized to reduce the carrying value of the long-lived asset to its estimated fair value. The determination of future cash flows as well as the estimated fair value of long-lived assets involve significant estimates on the part of management. If there is a material change in economic conditions or other circumstances influencing the estimate of future cash flows or fair value, Schlumberger could be required to recognize impairment charges in the future. Intangible assets consist primarily of customer relationships, technology/technical know-how and tradenames acquired in business combinations. Customer relationships are generally amortized over periods ranging from 7 to 28 years, acquired technology/technical know-how are generally amortized over periods ranging from 5 to 18 years and tradenames are generally amortized over periods ranging from 5 years to 30 years.
Taxes on Income	*Taxes on Income* Schlumberger computes taxes on income in accordance with the tax rules and regulations of the many taxing authorities where the income is earned. The income tax rates imposed by these taxing authorities vary substantially. Taxable income may differ from pretax income for financial accounting purposes. To the extent that differences are due to revenue or expense items reported in one period for tax purposes and in another period for financial accounting purposes, an appropriate provision for deferred income taxes is made. Any effect of changes in income tax rates or tax laws are included in the provision for income taxes in the period of enactment. When it is more likely than not that a portion or all of the deferred tax asset will not be realized in the future, Schlumberger provides a corresponding valuation allowance against deferred tax assets. Schlumberger’s tax filings are subject to regular audit by the tax authorities in most of the jurisdictions in which it conducts business. These audits may result in assessments for additional taxes which are resolved with the authorities or, potentially, through the courts. Schlumberger recognizes the impact of a tax position in its financial statements if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Tax liabilities are recorded based on estimates of additional taxes which will be due upon the conclusion of these audits. Estimates of these tax liabilities are made based upon prior experience and are updated in light of changes in facts and circumstances. However, due to the uncertain and complex application of tax regulations, it is possible that the ultimate resolution of audits may result in liabilities which could be materially different from these estimates. In such an event, Schlumberger will record additional tax expense or tax benefit in the year in which such resolution occurs. Schlumberger generally does not provide income taxes relating to undistributed earnings, as the earnings either would not be taxable when remitted or are considered to be indefinitely reinvested.
Concentration of Credit Risk	*Concentration of Credit Risk* Schlumberger’s assets that are exposed to concentrations of credit risk consist primarily of cash, short-term investments, fixed income investments held to maturity, receivables from clients and derivative financial instruments. Schlumberger places its cash, short-term investments and fixed income investments held to maturity with financial institutions and corporations, and limits the amount of credit exposure with any one of them. Schlumberger regularly evaluates the creditworthiness of the issuers in which it invests. The receivables from clients are spread over many countries and customers. Schlumberger maintains an allowance for uncollectible accounts receivable based on expected collectibility and performs ongoing credit evaluations of its customers’ financial condition. By using derivative financial instruments to hedge exposure to changes in exchange rates and commodity prices, Schlumberger exposes itself to some credit risk. Schlumberger minimizes this credit risk by entering into transactions with high-quality counterparties, limiting the exposure to each counterparty and monitoring the financial condition of its counterparties.
Research & Engineering	*Research & Engineering* All research and engineering expenditures are expensed as incurred.
Earnings Per Share	*Earnings per Share* Basic earnings per share of Schlumberger from continuing operations is calculated by dividing income from continuing operation attributable to Schlumberger by the weighted average number of common shares outstanding during the year. Diluted earnings per share is calculated by first adding back to net income the interest expense on any outstanding convertible debentures and then dividing this adjusted income from continuing operations attributable to Schlumberger by the sum of (i) unvested restricted stock units; and (ii) the weighted average number of common shares outstanding assuming dilution. The weighted average number of common shares outstanding assuming dilution assumes (a) that all stock options which are in the money are exercised at the beginning of the period and that the proceeds are used by Schlumberger to purchase shares at the average market price for the period, and (b) the conversion of any outstanding convertible debentures.

Summary of Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Accounting Policies [Abstract]

Reconciliation of Earnings Per Share


(Stated in million except per share amounts)
	Schlumberger Income from Continuing Operations		Weighted Average Shares Outstanding		Earnings Per Share from from Continuing Operations
2011:
Basic	$	4,777		1,349	$	3.54

Assumed exercise of stock options		–		10
Unvested restricted stock		–		2

Diluted	$	4,777		1,361	$	3.51

2010:
Basic	$	4,267		1,250	$	3.41

Assumed conversion of debentures		3		2
Assumed exercise of stock options		–		9
Unvested restricted stock		–		2

Diluted	$	4,270		1,263	$	3.38

2009:
Basic	$	3,156		1,198	$	2.63

Assumed conversion of debentures		8		8
Assumed exercise of stock options		–		7
Unvested restricted stock		–		1

Diluted	$	3,164		1,214	$	2.61

Charges and Credits (Tables)

12 Months Ended

Dec. 31, 2011

Charges and Credits [Abstract]

Summary of Charges


(Stated in millions)
	Pretax		Tax		Net		Consolidated Statement of Income Classification
Merger-related integration costs	$	115	$	19	$	96	Merger & integration
Donation to the Schlumberger Foundation		50		10		40	General & administrative
Write-off of assets in Libya		60		–		60	Cost of revenue -Oilfield Services

	$	225	$	29	$	196

Repurchase of Debt


	(Stated in millions)
	Carrying Value
6.50% Notes due 2012	$	297
6.75% Senior Notes due 2011	$	123
9.75% Senior Notes due 2019	$	212
6.00% Senior Notes due 2016	$	102
8.625% Senior Notes due 2014	$	88

Schedule of Merger Related Charges


					(Stated in millions)
	Pretax			Tax			Net			Consolidated Statement of Income Classification
Restructuring and Merger-related Charges:
Severance and other	$	90		$	13		$	77		Restructuring & other
Impairment relating to WesternGeco’s first generation Q-Land acquisition system		78			7			71		Restructuring & other
Other WesternGeco-related charges		63			–			63		Restructuring & other
Professional fees and other		107			1			106		Merger & integration
Merger-related employee benefits		58			10			48		Merger & integration
Inventory fair value adjustments		153			56			97		Cost of revenue -Oilfield Services
Mexico restructuring		40			4			36		Restructuring & other
Repurchase of bonds		60			23			37		Restructuring & other

Total restructuring and merger-related charges		649			114			535

Gain on investment in M-I SWACO		(1,270	)		(32	)		(1,238	)	Gain on Investment in M-I SWACO
Impact of elimination of tax deduction related to Medicare Part D subsidy		–			(40	)		40		Taxes on income

	$	(621	)	$	42		$	(663	)

Schedule of charges related to workforce reductions


			(Stated in millions)
	Pretax		Tax		Net		Consolidated Statement of Income Classification
Workforce reductions	$	102	$	17	$	85	Restructuring & other
Postretirement benefits curtailment		136		14		122	Restructuring & other

	$	238	$	31	$	207

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2011

Acquisitions [Abstract]

Schedule of Fair Value of Consideration Transferred to Effect Merger


(Stated in millions, except exchange ratio and per share amounts)
Number of shares of Smith common stock outstanding as of the acquisition date		248
Number of Smith unvested restricted stock units outstanding as of the acquisition date		4

		252
Multiplied by the exchange ratio		0.6966

Equivalent Schlumberger shares of common stock issued		176
Schlumberger closing stock price on August 27, 2010	$	55.76

Common stock equity consideration	$	9,812
Fair value of Schlumberger equivalent stock options issued		16

Total fair value of the consideration transferred	$	9,828

Business Combination Preliminary Allocation of Purchase Price Disclosure


(Stated in millions)
Cash	$	399
Receivables		1,831
Inventories ⁽¹⁾		2,013
Fixed assets		2,017
Intangible assets:
Tradenames (weighted-average life of 25 years)		1,560
Technology (weighted-average life of 16 years)		1,170
Customer relationships (weighted average life of 23 years)		1,360
Other assets		429
Accounts payable and accrued liabilities		(1,460	)
Long-term debt ⁽²⁾		(2,141	)
Deferred taxes ⁽³⁾		(1,936	)
Other liabilities		(528	)

	$	4,714
Less:
Investment in M-I SWACO ⁽⁴⁾		(1,429	)
Noncontrolling interests		(111	)

Total identifiable net assets	$	3,174
Gain on investment in M-I SWACO ⁽⁴⁾		(1,238	)
Goodwill ⁽⁵⁾		7,892

Total consideration transferred	$	9,828

(1)

(2)

(3)

(4)

(5)

Preliminary Estimates of the Fair value of Identifiable Assets Acquired and Liabilities Assumed


	(Stated in millions)

Cash	$	26
Fixed assets		75
Goodwill		658
Intangible assets		377
Other assets		150
Long-term debt		(145	)
Deferred taxes		(68	)
Other liabilities		(158	)

	$	915

Tabular disclosure of a material business combination completed during the period, including background, timing, and recognized assets and liabilities. This table does not include leveraged buyouts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Appendix F
-Paragraph F4
-Subparagraph e

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1392-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1486-128463

Property, Plant and Equipment

Inventory (Tables)

12 Months Ended

Dec. 31, 2011

Inventory [Abstract]

Inventory Disclosure


(Stated in millions)
As at December 31,	2011		2010
Raw materials & field materials	$	2,066	$	1,833
Work in process		364		249
Finished goods		2,270		1,722

	$	4,700	$	3,804

Fixed Assets (Tables)

12 Months Ended

Dec. 31, 2011

Fixed Assets [Abstract]


(Stated in millions)
As at December 31,	2011		2010
Land		$362		$314
Buildings & improvements		2,912		2,631
Machinery & equipment		24,404		21,873
Seismic vessels		1,873		1,861

		29,551		26,679
Less accumulated depreciation		16,558		14,608

		$12,993		$12,071

Multiclient Seismic Data (Tables)

12 Months Ended

Dec. 31, 2011

Multiclient Seismic Data [Abstract]

Multiclient Seismic Data Table


(Stated in millions)
	2011			2010
Balance at beginning of year		$394			$288
Capitalized in year		289			326
Charged to expense		(258	)		(220	)

		$425			$394

Goodwill (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill [Abstract]

Schedule of Goodwill


(Stated in millions)
	Reservoir Characterization			Drilling			Reservoir Production			Distribution		Total
Balance at January 1, 2011		$3,381			$8,150			$2,351			$70		$13,952
Adjustments relating to Smith acquisition		–			175			13			6		194
Other acquisitions		42			45			–			–		87
Divestiture of business		(51	)		–			–			–		(51	)
Impact of changes in exchange rates		(12	)		(8	)		(8	)		–		(28	)

Balance, December 31, 2011		$3,360			$8,362			$2,356			$76		$14,154

Changes in the carrying amount of goodwill


(Stated in millions)
Balance, January 1, 2010	$	5,305
Acquisition of Smith		7,892
Other additions		761
Impact of change in exchange rates		(6	)

Balance, December 31, 2010	$	13,952

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

Schedule of Intangible Assets by Major Class

Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Intangible Assets [Abstract]


(Stated in millions)
	2011						2010
	Gross Book Value		Accumulated Amortization		Net Book Value		Gross Book Value		Accumulated Amortization		Net Book Value
Technology/Technical Know-How	$	1,875	$	341	$	1,534	$	1,846	$	215	$	1,631
Tradenames		1,677		131		1,546		1,678		61		1,617
Customer Relationships		1,954		209		1,745		1,963		129		1,834
Other		356		299		57		378		298		80

	$	5,862	$	980	$	4,882	$	5,865	$	703	$	5,162

Long-term Debt and Debt Facility Agreements(Tables)

12 Months Ended

Dec. 31, 2011

Long-term Debt and Debt Facility Agreements [Abstract]

Long-term Debt


(Stated in millions)
As at December 31,	2011		2010
3.300% Senior Notes due 2021		$1,595		$–
4.50% Guaranteed Notes due 2014		1,297		1,319
2.75% Guaranteed Notes due 2015		1,290		1,310
1.950% Senior Notes due 2016		1,099		–
4.200% Senior Notes due 2021		1,099		–
5.25% Guaranteed Notes due 2013		649		659
2.650% Senior Notes due 2016		498		–
3.00% Guaranteed Notes due 2013		450		450
Floating Rate Senior Notes due 2014		300		–
9.75% Senior Notes due 2019		–		776
8.625% Senior Notes due 2014		–		272
6.00% Senior Notes due 2016		–		218
Commercial paper borrowings		–		367
Other variable rate debt		271		133

		8,548		5,504
Fair value adjustment – hedging ⁽¹⁾		8		13

		$8,556		$5,517

⁽¹⁾	Represents changes in the fair value of the portion of Schlumberger’s fixed rate debt that is hedged through the use of interest rate swaps.

Summary of other long-term debt by currency

(Stated in millions)

2011

2010

Bonds and
Notes

Other

Total

Bonds and
Notes

Other

Total

US dollar

$7,787

$–

$47

$7,834

$5,017

$–

$104

$5,121

Euro

498

–

151

649

–

183

–

183

Norwegian kroner

–

Pound sterling

–

184

–

184

Other

–

$8,285

$–

$271

$8,556

$5,017

$367

$133

$5,517

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Derivative Instruments and Hedging Activities [Abstract]

Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2011

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value


(Stated in millions)
	Fair Value of Derivatives				Consolidated Balance Sheet Classification
Derivative assets	Dec. 31, 2011		Dec. 31, 2010		Consolidated Balance Sheet Classification
Derivative designated as hedges:
Foreign exchange contracts		$2		$4	Other current assets
Foreign exchange contracts		4		37	Other Assets
Interest rate swaps		9		14	Other Assets

		15		55

Derivative not designated as hedges:
Commodity contracts		–		3	Other current assets
Foreign exchange contracts		8		9	Other current assets
Foreign exchange contracts		9		9	Other Assets

		17		21

		$32		$76

Derivative Liabilities
Derivative designated as hedges:
Foreign exchange contracts		$47		$9	Accounts payable and accrued liabilities
Foreign exchange contracts		130		77	Other Liabilities
Interest rate swaps		–		7	Accounts payable and accrued liabilities

		177		93

Derivative not designated as hedges:
Commodity contracts		3		–	Accounts payable and accrued liabilities
Foreign exchange contracts		9		14	Accounts payable and accrued liabilities

		12		14

		$189		$107

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance


(Stated in millions)
	Gain (Loss) Recognized in Income
	2011			2010			2009		Consolidated Statement of Income Classifiaction
Derivatives designated as fair value hedges:
Foreign exchange contracts	$	–		$	(8	)	$	105	Cost of revenue - Oilfield Services
Interest rate swaps		9			22			6	Interest expense

	$	9		$	14		$	111

Derivatives not designated as hedges:
Foreign exchange contracts	$	(17	)	$	(13	)	$	32	Cost of revenue - Oilfield Services
Commodity contracts		(5	)		1			2	Cost of revenue - Oilfield Services

	$	(22	)	$	(12	)	$	34

Schedule of Derivative Instruments, Effect on Income and Other Comprehensive Income


(Stated in millions)
	Gain (Loss) Reclassified from AOCL into Income
	2011			2010			2009			Consolidated Statement of Income Classification
Foreign exchange contracts	$	(25	)	$	(260	)	$	95		Cost of revenue - Oilfield Services
Foreign exchange contracts		17			(14	)		(15	)	Research & engineering

	$	(8	)	$	(274	)	$	80


	(Stated in millions)
	Gain (Loss) Recognized in AOCL
	2011		2010			2009
Foreign exchange contracts	$	79	$	(269	)	$	223

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

Schedule of accumulated other comprehensive loss

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Equity [Abstract]


	(Stated in millions)
	2011			2010			2009
Currency translation adjustments	$	(993	)	$	(912	)	$	(886	)
Fair value of derivatives		(26	)		45			40
Pension and other postretirement benefit plans		(2,538	)		(1,901	)		(1,828	)


	$	(3,557	)	$	(2,768	)	$	(2,674	)

Stock Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2011

Stock Compensation Plans [Abstract]

Weighted-average assumptions


	2011			2010			2009
Dividend yield		1.2	%		1.3	%		1.2	%
Expected volatility		37	%		35	%		34	%
Risk free interest rate		2.8	%		2.9	%		2.2	%
Expected option life in years		6.9			6.9			6.9
Weighted-average fair value per share	$	31.38		$	24.13		$	13.92

Options outstanding and option exercisable


(Shares stated in thousands)
	Options Outstanding						Options Exercisable
			Weighted-
			average		Weighted-
			remaining		average				Weighted-
	Options		contractual life		exercise		Options		average
Exercise prices range	Outstanding		(in years)		price		Exercisable		exercise price
$19.04 - $32.46		2,764		0.99	$	27.35		2,764	$	27.35
$32.62 - $37.85		5,921		6.67	$	37.43		2,109	$	36.69
$39.08 - $55.69		6,116		5.00	$	52.71		4,929	$	53.45
$56.61 - $74.00		11,223		7.19	$	65.09		4,199	$	62.50
$83.89 - $110.78		14,003		8.02	$	86.08		2,885	$	89.48

		40,027		6.64	$	63.84		16,886	$	55.49

Summary of stock option activity


(Shares stated in thousands)
	2011					2010					2009
				Weighted-					Weighted-					Weighted-
				average					average					average
				exercise					exercise					exercise
	Shares			price		Shares			price		Shares			price
Outstanding at beginning of year		37,499		$	55.33		35,500		$	50.30		32,301		$	50.36
Granted		9,528		$	84.29		8,283		$	66.67		7,981		$	40.87
Assumed in Smith transaction		–		$	–		581		$	28.77		–		$	–
Exercised		(5,470	)	$	42.36		(5,962	)	$	37.60		(3,851	)	$	29.00
Forfeited		(1,530	)	$	58.82		(903	)	$	61.28		(931	)	$	58.82


Outstanding at year-end		40,027		$	63.84		37,499		$	55.33		35,500		$	50.30

Restricted stock transactions


(Shares stated in thousands)
	2011					2010					2009
				Weighted					Weighted					Weighted
				Average					Average					Average
	Restricted			Grant Date		Restricted			Grant Date		Restricted			Grant Date
	Stock			Fair Value		Stock			Fair Value		Stock			Fair Value
Unvested at beginning of year		2,223		$	64.27		1,343		$	62.75		1,701		$	66.49
Granted		1,136			84.61		1,261			65.79		304			48.14
Vested		(767	)		67.36		(286	)		63.92		(580	)		65.15
Forfeited		(159	)		72.51		(95	)		64.16		(82	)		69.23


Unvested at end of year		2,433		$	72.25		2,223		$	64.27		1,343		$	62.75

Discounted Stock Purchase Plan Assumptions and Resulting Weighted Average Fair Value


	2011			2010			2009
Dividend yield		1.2	%		1.6	%		1.1	%
Expected volatility		28	%		36	%		44	%
Risk free interest rate		0.2	%		0.3	%		0.3	%
Weighted average fair value per share	$	12.83		$	10.30		$	9.76

Stock-based compensation expense recognized in income

The following summarizes stock-based compensation expense recognized in income:


(Stated in millions)
	2011		2010		2009
Stock options	$	176	$	121	$	118
Restricted stock		60		44		32
DSPP		36		33		36


	$	272	$	198	$	186

Income Tax (Tables)

12 Months Ended

Dec. 31, 2011

Income Tax [Abstract]

Income Tax Disclosure Table


	(Stated in millions)
	2011		2010		2009
United States	$	2,325	$	638	$	86
Outside United States		4,013		4,518		3,848


	$	6,338	$	5,156	$	3,934

Components of Net Deferred Tax Assets


	(Stated in millions)
	2011			2010
Postretirement benefits	$	440		$	327
Intangible assets		(1,498	)		(1,674	)
Investments in non-US subsidiaries		(349	)		(353	)
Other, net		132			115


	$	(1,275	)	$	(1,585	)

Components of Consolidated Income Taxes


(Stated in millions)
	2011			2010			2009
Current:
United States – Federal	$	842		$	76		$	(191	)
United States – State		45			14			(6	)
Outside United States		693			909			594


	$	1,580		$	999		$	397

Deferred:
United States – Federal	$	(80	)	$	183		$	247
United States – State		(7	)		2			13
Outside United States		73			(281	)		86
Valuation allowance		(21	)		(13	)		27


	$	(35	)	$	(109	)	$	373


Consolidated taxes on income	$	1,545		$	890		$	770

Reconciliation of the US Statutory Federal Tax Rate


	2011			2010			2009
US statutory federal rate		35	%		35	%		35	%
Non-US income taxed at different rates		(10	)		(14	)		(16	)
Charges and credit (See Note 3)		—			(3	)		1
Other		(1	)		(1	)		—


Effective income tax rate		24	%		17	%		20	%

Reconciliation of the liabilities associated with uncertain tax provisions


	(Stated in millions)
	2011			2010			2009
Balance at beginning of year	$	1,338		$	1,026		$	877
Additions based on tax positions related to the current year		153			190			178
Additions for tax positions of prior years		49			8			36
Additions related to acquisitions		48			288			—
Impact of changes in exchange rates		(18	)		(3	)		39
Settlements with tax authorities		(77	)		(36	)		(16	)
Reductions for tax positions of prior years		(102	)		(99	)		(68	)
Reductions due to the lapse of the applicable statute of limitations		(38	)		(36	)		(20	)


Balance at end of year	$	1,353		$	1,338		$	1,026

Tax years subject to examination by the tax authorities


Brazil			2005 –2011
Canada			2004 –2011
Mexico			2006 –2011
Norway			2003 – 2011
Russia			2008 – 2011
Saudi Arabia			2001 – 2011
United Kingdom			2009 – 2011
United States			2005 – 2011

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

Tabular disclosure of income tax examinations that an enterprise is currently subject to or that have been completed in the current period typically including a description of the examination, the jurisdiction conducting the examination, the tax year(s) under examination, the likelihood of an unfavorable settlement, the range of possible losses, the liability recorded, the increase or decrease in the liability from the prior period, and any penalties and interest that have been recorded.

Contingencies and Leases and Lease Commitments [Abstract]

Leases and Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2011

Future minimum rental commitments under noncancelable operating leases


(Stated in millions)
2012	$	313
2013		239
2014		181
2015		150
2016		105
Thereafter		441

	$	1,429

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

Schedule of Segment Reporting Information, by Segment

Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Segment Information [Abstract]


									(Stated in millions)
	2011
	Revenue			Income before taxes			Assets		Depn. & Amortn.		Capital Expenditures
*OILFIELD SERVICES*
Reservoir Characterization	$	9,929		$	2,449		$	7,621	$	1,285	$	1,057
Drilling		14,248			2,275			9,268		1,026		1,460
Reservoir Production		12,748			2,616			7,834		598		1,343
Eliminations & other ⁽¹⁾		34			(35	)		1,956		163		148

		36,959			7,305			26,679		3,072		4,008

*DISTRIBUTION*		2,621			103			939		6		8
Eliminations		(40	)		—

		2,581			103
Goodwill and intangible assets								19,036
All other assets								2,198
Corporate ⁽²⁾					(592	)		6,349		203
Interest income ⁽³⁾					37
Interest expense ⁽⁴⁾					(290	)
Charges & credits ⁽⁵⁾					(225	)

	$	39,540		$	6,338		$	55,201	$	3,281	$	4,016


								(Stated in millions)
	2010
	Revenue		Income before taxes			Assets		Depn. & Amortn.		Capital Expenditures
*OILFIELD SERVICES*
Reservoir Characterization	$	9,321	$	2,321		$	7,338	$	1,246	$	885
Drilling		8,230		1,334			8,490		756		968
Reservoir Production		9,053		1,368			6,119		536		824
Eliminations & other ⁽¹⁾		69		48			1,801		142		234

		26,673		5,071			23,748		2,680		2,911

*DISTRIBUTION*		774		29			780		2		2
Goodwill and intangible assets							19,114
All other assets							1,580
Corporate ⁽²⁾				(405	)		6,545		77		1
Interest income ⁽³⁾				43
Interest expense ⁽⁴⁾				(202	)
Charges & credits ⁽⁵⁾				620

	$	27,447	$	5,156		$	51,767	$	2,759	$	2,914


								(Stated in millions)
	2009
	Revenue		Income before taxes			Assets		Depn. & Amortn.		Capital Expenditures
*OILFIELD SERVICES*
Reservoir Characterization	$	9,502	$	2,559		$	7,090	$	1,221	$	1,085
Drilling		5,881		1,245			3,628		620		470
Reservoir Production		7,282		780			5,006		503		632
Eliminations & other ⁽¹⁾		37		51			2,117		121		203

		22,702		4,635			17,841		2,465		2,390

Goodwill and intangible assets							6,091
All other assets							1,873
Corporate ⁽²⁾				(327	)		7,660		11		5
Interest income ⁽³⁾				52
Interest expense ⁽⁴⁾				(188	)
Charges & credits ⁽⁵⁾				(238	)

	$	22,702	$	3,934		$	33,465	$	2,476	$	2,395

(1)	Includes certain headquarter administrative costs which are not allocated to the segments, and certain other operations and other cost and income items maintained at the Oilfield Services level.

(2)

(3)	Interest income excludes amounts which are included in the segments’ income (2011—$3 million: 2010—$7 million; 2009—$10 million).

(4)	Interest expense excludes amounts which are included in the segments’ income (2011—$8 million; 2010—$5 million; 2009—$33 million).

(5)	See Note 3 – Charges and Credits.

Revenue by geographic area


			(Stated in millions)
	2011		2010		2009
*OILFIELD SERVICES*
North America	$	12,273	$	6,729	$	4,217
Latin America		6,453		4,985		4,552
Europe/CIS/Africa		9,761		8,024		7,737
Middle East & Asia		8,065		6,650		5,961
Eliminations & other		407		285		235

		36,959		26,673		22,702

DISTRIBUTION		2,581		774		—

	$	39,540	$	27,447	$	22,702

Fixed Assets less accumulated depreciation by geographic area


(Stated in millions)
		2011		2010		2009

*OILFIELD SERVICES*
North America	$	4,220	$	3,624	$	2,229
Latin America		1,472		1,274		995
Europe/CIS/Africa		3,324		3,310		2,763
Middle East & Asia		2,233		2,004		1,797
Unallocated ⁽¹⁾		1,744		1,859		1,876

	$	12,993	$	12,071	$	9,660

⁽¹⁾	Represents seismic vessels, including the related on-board equipment, which frequently transition between geographic areas.

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

Defined Benefit Plan Disclosure [Line Items]

Pension and Other Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Net Pension Cost for the Schlumberger Pension Plans and US Postretirement Medical Plan


(Stated in millions)
	US									International
	2011			2010			2009			2011			2010			2009
Service cost—benefits earned during the period	$	59		$	56		$	52		$	64		$	51		$	67
Interest cost on projected benefit obligation		150			142			143			226			208			189
Expected return on plan assets		(170	)		(191	)		(166	)		(279	)		(228	)		(181	)
Amortization of net loss		90			60			29			31			19			—
Amortization of prior service cost		12			4			5			120			113			117

		141			71			63			162			163			192
Curtailment charge		—			—			32			—			—			98

	$	141		$	71		$	95		$	162		$	163		$	290


(Stated in millions)
	2011			2010			2009
Service cost – benefits earned during the period	$	24		$	23		$	19
Interest cost on projected benefit obligation		57			58			56
Expected return on plan assets		(20	)		(6	)		(2	)
Amortization of prior service credit		(12	)		(21	)		(25	)
Amortization of net loss		13			11			3

		62			65			51
Curtailment charge		–			–			6

	$	62		$	65		$	57

The weighted-average assumed discount rate, compensation increases and the expected long-term rate of return on plan assets used to determine the net pension cost for the US and International plans


	US									International
	2011			2010			2009			2011			2010			2009
Discount rate		5.50	%		6.00	%		6.94	%		5.47	%		5.89	%		6.81	%
Compensation increases		4.00	%		4.00	%		4.00	%		4.91	%		4.93	%		4.93	%
Return on plan assets		7.50	%		8.50	%		8.50	%		7.50	%		8.00	%		8.00	%

The weighted-average assumed discount rate and compensation increases used to determine the projected benefit obligations for the US and International plans


	US						International
	2011			2010			2011			2010
Discount rate		5.00	%		5.50	%		4.95	%		5.47	%
Compensation increases		4.00	%		4.00	%		4.91	%		4.91	%

Changes in the projected benefit obligation, plan assets and funded status of the plans


							(Stated in millions)
	US						International
	2011			2010			2011			2010
*Change in Projected Benefit Obligations*
Projected benefit obligation at beginning of year	$	2,769		$	2,439		$	4,088		$	3,518
Service cost		59			56			64			51
Interest cost		150			142			226			208
Contributions by plan participants		–			–			102			76
Actuarial losses		225			172			321			310
Currency effect		–			–			(8	)		(28	)
Benefits paid		(130	)		(122	)		(127	)		(121	)
Plan amendments		–			82			–			74

Projected benefit obligation at end of year	$	3,073		$	2,769		$	4,666		$	4,088

*Change in Plan Assets*
Plan assets at fair value at beginning of year	$	2,635		$	2,254		$	3,764		$	2,976
Actual return on plan assets		78			316			–			426
Currency effect		–			–			(6	)		(26	)
Company contributions		72			187			364			433
Contributions by plan participants		–			–			102			76
Benefits paid		(130	)		(122	)		(127	)		(121	)

Plan assets at fair value at end of year	$	2,655		$	2,635		$	4,097		$	3,764

*Unfunded Liability*	$	(418	)	$	(134	)	$	(569	)	$	(324	)

*Amounts Recognized in Balance Sheet*
Postretirement Benefits	$	(418	)	$	(134	)	$	(569	)	$	(367	)
Other Assets		–			–			–			43

	$	(418	)	$	(134	)	$	(569	)	$	(324	)

*Amounts Recognized in Accumulated Other Comprehensive Loss*
Actuarial losses	$	1,048		$	819		$	1,002		$	447
Prior service cost		101			114			729			840

	$	1,149		$	933		$	1,731		$	1,287

Accumulated benefit obligation	$	2,861		$	2,568		$	4,336		$	3,785

The weighted-average allocation of plan assets and the target allocation by asset category


	US									International
	Target			2011			2010			Target			2011			2010
Equity securities		45 – 50	%		47	%		52	%		50 – 70	%		51	%		61	%
Debt securities		33 –43			39			40			25 – 35			38			31
Cash and cash equivalents		0 – 2			6			2			0 – 2			4			3
Alternative investments		0 – 10			8			6			0 – 20			7			5

		100	%		100	%		100	%		100	%		100	%		100	%

The fair value of Schlumberger's pension plan assets


(Stated in millions)
	US Plan Assets
	2011								2010
	Total		Level One		Level Two		Level Three		Total		Level One		Level Two		Level Three
Asset Category:
Cash and Cash Equivalents	$	147	$	39	$	108	$	–	$	67	$	35	$	32	$	–
Equity Securities:
US^(a)		806		471		335				885		635		250
International^(b)		453		369		84				473		370		103
Debt Securities:
Corporate bonds^(c)		340				340				220				220
Government and government-related debt securities^(d)		545		146		399				554		148		406
Government agency collateralized mortgage obligations and mortgage backed securities^(e)		96				96				201				201
Other collateralized mortgage obligations and mortgage-backed securities^(f)		58				58				67				67
Alternative Investments:
Private equity^(g)		160						160		128						128
Real estate^(h)		50						50		40						40

Total	$	2,655	$	1,025	$	1,420	$	210	$	2,635	$	1,188	$	1,279	$	168

(Stated in millions)
	International Plan Assets
	2011								2010
	Total		Level One		Level Two		Level Three		Total		Level One		Level Two		Level Three
Asset Catergory:
Cash and Cash Equivalents	$	152	$	152	$	–	$	–	$	106	$	106	$	–	$	–
Equity Securities:
US^(a)		1,170		1,018		152				1,268		1,117		151
International^(b)		937		651		286				1,031		1,031
Debt Securities:
Corporate bonds^(c)		399				399				289		15		274
Government and government-related^(d)		808		551		257				693		365		328
Government agency collateralized mortgage obligations and mortgage backed securities^(e)		268		190		78				125		44		81
Other collateralized mortgage obligations and mortgage-backed securities^(f)		93				93				74				74
Alternative Investments:
Private equity^(g)		150						150		114						114
Real estate^(h)		62						62		64						64
Other		58						58

Total	$	4,097	$	2,562	$	1,265	$	270	$	3,764	$	2,678	$	908	$	178

(a)	US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.

(b)

(c)	Corporate bonds consist primarily of investment grade bonds from diversified industries.

(d)	Government and government-related debt securities are comprised primarily of inflation protected US treasuries and, to a lesser extent, other government-related securities.

(e)

(f)	Other collateralized mortgage obligations and mortgage-backed securities are debt obligations that represent claims to the cash flows from pools of mortgage loans which are purchased from banks, mortgage companies, and other originators and then assembled into pools by private entities.

(g)	Private equity includes investments in several fund of funds limited partnerships.

(h)	Real estate primarily includes investments in real estate limited partnerships, concentrated in commercial real estate.

Defined benefit plan weighted average assumptions used in calculating benefit obligation and net periodic benefit cost for the postretirement medical plan


	Benefit Obligation at December 31,						Net Periodic Benefit Cost for the year
	2011			2010			2011			2010			2009
Discount rate		5.00	%		5.50	%		5.50	%		6.00	%		6.94	%
Return on plan assets		–			–			7.00	%		8.00	%		8.00	%
Current medical cost trend rate		8.00	%		8.00	%		8.00	%		8.00	%		8.00	%
Ultimate medical cost trend rate		5.00	%		5.00	%		5.00	%		5.00	%		5.00	%
Year that the rate reaches theultimate trend rate		2018			2017			2017			2016			2015

The changes in the accumulated postretirement benefit obligation, plan assets and funded status


(Stated in millions)
	2011			2010
*Change in Accumulated Postretirement Benefit Obligation*
Benefit obligation at beginning of year	$	1,051		$	991
Service cost		24			23
Interest cost		57			58
Contributions by plan participants		6			4
Actuarial losses		90			8
Benefits paid		(40	)		(33	)

Benefit obligation at end of year	$	1,188		$	1,051

*Change in Plan Assets*
Plan assets at fair value at beginning of year	$	290		$	58
Company contributions		165			248
Contributions by plan participants		6			5
Benefits paid		(40	)		(33	)
Actual return on plan assets		22			12

Plan assets at fair value at end of year	$	443		$	290

*Unfunded Liability*	$	(745	)	$	(761	)

*Amounts Recognized in Accumulated*
*Other Comprehensive Loss*
Actuarial losses	$	286		$	212
Prior service cost		(24	)		(35	)

	$	262		$	177

Effect of one percentage point change in assumed health care cost trend rates


(Stated in millions)
	One percentage point increase		One percentage point decrease
Effect on total service and interest cost components	$	16		$	(13	)
Effect on accumulated postretirement benefit obligation	$	196		$	(160	)

The expected benefits to be paid under the US and International pension plans and the postretirement medical plan


(Stated in millions)
	Pension Benefits				Postretirement Medical Plan
	US		International		Postretirement Medical Plan
2012	$	135	$	156	$	45
2013		139		168		49
2014		143		183		52
2015		149		197		55
2016		155		215		59
2017- 2021		911		1,250		352

Defined benefit plan, amounts that will be amortized from accumulated other comprehensive income (loss) in next fiscal year


(Stated in millions)
	Pension Plans		Postretirement Medical Plan
Net actuarial losses	$	104	$	18
Prior service cost (credit)	$	132	$	(8	)

Supplementary Information (Tables)

12 Months Ended

Dec. 31, 2011

Business Description and Supplementary Information [Abstract]

Cash paid for interest and income taxes


(Stated in millions)
	2011		2010		2009
Interest	$	294	$	234	$	249
Income taxes	$	1,836	$	571	$	665

Accounts payable and accrued liabilities


(Stated in millions)
	2011		2010
Payroll, vacation and employee benefits	$	1,597	$	1,414
Trade		3,389		2,649
Other		2,593		2,425

	$	7,579	$	6,488

Interest and other income, net


(Stated in millions)
	2011		2010		2009
Interest income	$	40	$	50	$	61
Equity in net earnings of affiliated companies:
M-I SWACO		–		78		131
Others		89		86		78
Other		–		–		3

	$	129	$	214	$	273

Allowance for doubtful accounts


(Stated in millions)
	2011			2010			2009
Balance at beginning of year	$	185		$	160		$	133
Provision		37			38			54
Amounts written off		(45	)		(13	)		(27	)

Balance at end of year	$	177		$	185		$	160

Summary of Accounting Policies (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schlumberger Income from continuing operations
Basic	$ 4,777	$ 4,267	$ 3,156
Assumed conversion of debentures		3	8
Diluted	$ 4,777	$ 4,270	$ 3,164
Weighted Average shares outstanding
Basic	1,349	1,250	1,198
Assumed conversion of debentures		2	8
Assumed exercise of stock options	10	9	7
Unvested restricted stock	2	2	1
Diluted	1,361	1,263	1,214
Earnings Per Share from Continuing Operations
Basic	$ 3.54	$ 3.41	$ 2.63
Diluted	$ 3.51	$ 3.38	$ 2.61

Summary of Accounting Policies (Details Textual) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) Year shares	Dec. 31, 2010 USD ($) shares	Dec. 31, 2009 USD ($) shares
Summary of Accounting Policies (Textual) [Abstract]
Transaction Gains of Hedging Activities \| $	$ 25	$ 27	$ 73
Trading Investments \| $	190	189
Fixed Income Investments, held to maturity \| $	256	$ 484
Fixed Income Investments, held to maturity, 2013 \| $	80
Fixed Income Investments, held to maturity, 2014 \| $	166
Fixed Income Investments, held to maturity, 2015 \| $	$ 10
Employee stock options to purchase \| shares	14.0	12.5	17.1
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible asset minimum \| Year	7
Useful life of intangible asset maximum \| Year	28
Technology/Technical Know-How [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible asset minimum \| Year	5
Useful life of intangible asset maximum \| Year	18
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of intangible asset minimum \| Year	5
Useful life of intangible asset maximum \| Year	30

Charges and Credits (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
Charges and Credits (Details) - USD ($) $ in Millions	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring Charges
Charges Pretax							$ 225	$ 621	$ 238
Charges, tax							29		31
Charges, net							196		$ 207
Merger-related transaction costs [Member]
Restructuring Charges
Charges Pretax	$ 22	$ 27	$ 32	$ 34	$ 56	$ 35
Charges, net	20	$ 23	$ 24	$ 28	$ 55
Merger-related transaction costs [Member] \| Merger and Integration [Member]
Restructuring Charges
Charges Pretax							115
Charges, tax							19
Charges, net							96
Donation to Schlumberger Foundation [Member] \| General and Administrative [Member]
Restructuring Charges
Charges Pretax							50
Charges, tax							10
Charges, net							40
Write-off of assets in Libya [Member]
Restructuring Charges
Charges, net	$ 60
Write-off of assets in Libya [Member] \| Cost of revenue [Member]
Restructuring Charges
Charges Pretax							60
Charges, net							$ 60

Charges and Credits (Details 1) $ in Millions	15 Months Ended
Charges and Credits (Details 1) $ in Millions	Dec. 31, 2011 USD ($)
6.50% Notes due 2012 [Member]
Repurchase of Debt
Carrying Value of Debt	$ 297
6.75% Senior Notes due 2011 [Member]
Repurchase of Debt
Carrying Value of Debt	123
9.75% Senior Notes due 2019 [Member]
Repurchase of Debt
Carrying Value of Debt	212
6.00% Senior Notes due 2016 [Member]
Repurchase of Debt
Carrying Value of Debt	102
8.625% Senior Notes due 2014 [Member]
Repurchase of Debt
Carrying Value of Debt	$ 88

Charges and Credits (Details 2) - USD ($) $ in Millions	3 Months Ended							12 Months Ended			15 Months Ended
Charges and Credits (Details 2) - USD ($) $ in Millions	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Mar. 31, 2010	Jun. 30, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011
Restructuring Charges
Charges Pretax								$ 225	$ 621	$ 238
Charges, tax								29		31
Charges, net								196		207
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax								225	621	238
Charges, net								196		207
Impairment related to equity-method investment					$ 30
Noncontrolling interests	$ 129							129	218		$ 129
Notes 6.50% Due 2012 [Member]
Restructuring Charges
Charges Pretax					28
Charges, net					18
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax					28
Charges, net					18
Repurchase Senior Notes					$ 352
Guaranteed notes face amount	650							$ 650			650
Debt instrument interest rate					6.50%
Gain on Purchase of Business [Member]
Restructuring Charges
Charges Pretax									(1,270)
Charges, tax									(32)
Charges, net									(1,238)
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax									(1,270)
Charges, net									(1,238)
Merger Related Employee Benefits [Member]
Restructuring Charges
Charges Pretax					$ 41				58		16
Charges, tax									10
Charges, net					35				48		12
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax					41				58		16
Charges, net					35				48		12
Inventory Fair Value Adjustments [Member]
Restructuring Charges
Charges Pretax					38				153		115
Charges, tax									56
Charges, net					24				97		73
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax					38				153		115
Charges, net					24				97		73
Professional and other fees charges [Member]
Restructuring Charges
Charges Pretax									107		17
Charges, tax									1
Charges, net									106		16
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax									107		17
Charges, net									106		16
Restructuring Charges [Member]
Restructuring Charges
Charges Pretax									649		32
Charges, tax									114
Charges, net									535		20
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax									649		32
Charges, net									535		$ 20
Other Charges on Restructuring [Member]
Restructuring Charges
Charges Pretax									63
Charges, net									63
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax									63
Charges, net									63
Mexico Restructuring Charges [Member]
Restructuring Charges
Charges Pretax					40				40
Charges, tax									4
Charges, net					36				36
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax					40				40
Charges, net					36				36
Repurchase of Bonds [Member]
Restructuring Charges
Charges Pretax									60
Charges, tax									23
Charges, net									37
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax									60
Charges, net									37
Impairment in Value of Asset [Member]
Restructuring Charges
Charges Pretax									78
Charges, tax									7
Charges, net									71
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax									78
Charges, net									71
M-I SWACO [Member]
Restructuring Charges
Charges Pretax					1,270
Charges, tax					1,240
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax					$ 1,270
Percentage of equity interest in joint venture					40.00%
Acquisition [Member]
Restructuring Charges
Charges Pretax									(621)
Charges, tax									42
Charges, net									(663)
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax									(621)
Charges, net									(663)
Employee Severance [Member]
Restructuring Charges
Charges Pretax					$ 90		$ 102		90	102
Charges, tax									13	17
Charges, net					77		85		77	85
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax					90		102		90	102
Charges, net					77		85		77	85
Special Termination Benefits [Member]
Restructuring Charges
Charges Pretax							136			136
Charges, tax										14
Charges, net							122			122
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax							136			136
Charges, net							$ 122			$ 122
WesternGeco First Generation Land Operation [Member]
Summary of Charges and Credit (Textual) [Abstract]
Impairment charges					71
Asset Impairment Charges					78
Medicare Part D Subsidy [Member]
Restructuring Charges
Charges, tax									(40)
Charges, net						$ 40			40
Summary of Charges and Credit (Textual) [Abstract]
Charges, net						40			$ 40
Merger-related transaction costs [Member]
Restructuring Charges
Charges Pretax	22	$ 27	$ 32	$ 34	56	35
Charges, net	20	23	24	28	55
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax	22	27	32	34	56	$ 35
Charges, net	20	$ 23	24	$ 28	55
General and Administrative [Member]
Restructuring Charges
Charges Pretax			50
Charges, net			40
Summary of Charges and Credit (Textual) [Abstract]
Charges Pretax			50
Charges, net			$ 40
WesternGeco Electromagnetic Service [Member]
Restructuring Charges
Charges, net					63
Summary of Charges and Credit (Textual) [Abstract]
Charges, net					$ 63
Write-off of assets in Libya [Member]
Restructuring Charges
Charges, net	60
Summary of Charges and Credit (Textual) [Abstract]
Charges, net	$ 60

Acquisitions (Details) $ in Millions	Dec. 31, 2011 shares	Dec. 31, 2010 shares	Aug. 27, 2010 USD ($) $ / shares shares	Dec. 31, 2009 shares	Dec. 31, 2008 shares
Fair Value of the Consideration Transferred to Effect Merger With Smith
Number of shares of Smith common stock outstanding as of the acquisition date	1,333,775,406	1,361,171,428	248,000,000
Number of Smith unvested restricted stock units outstanding as of the acquisition date			4,000,000
Total Shares Outstanding	1,334,000,000	1,361,000,000	252,000,000	1,195,000,000	1,194,000,000
Multiplied by the exchange Ratio			0.6966
Equivalent Schlumberger shares of common stock issued			176,000,000
Schlumberger closing stock price on August 27, 2010 \| $ / shares			55.76
Common stock equity consideration \| $			$ 9,812
Fair value of Schlumberger equivalent stock options issued \| $			16
Total fair value of the consideration transferred \| $			$ 9,828

Acquisitions (Details 1) $ in Millions	Dec. 31, 2011 USD ($)
Business Combination, Preliminary Allocation of the Purchase Price Disclosure
Cash	$ 399
Receivables	1,831
Inventories	2,013
Fixed assets	429
Accounts payable and accrued liabilities	(1,460)
Long-term debt	(2,141)
Deferred taxes	(1,936)
Other liabilities	(528)
Business Acquisition Purchase Price Allocation, Sub-total	4,714
Less:
Investment in M-I SWACO	(1,429)
Noncontrolling interests	(111)
Total identifiable net assets	3,174
Gain on investment in M-I SWACO	(1,238)
Goodwill	7,892
Total consideration transferred	9,828
Tradenames [Member]
Intangible assets:
Intangible assets	1,560
Technology/Technical Know-How [Member]
Intangible assets:
Intangible assets	1,170
Customer Relationships [Member]
Intangible assets:
Intangible assets	$ 1,360

Acquisitions (Details 2) - USD ($) $ in Millions	Dec. 31, 2011	Apr. 23, 2010
Preliminary Estimates of the Fair Value of Identifiable Assets Acquired and Liabilities Assumed
Cash	$ 399
Fixed assets	2,017
Goodwill	7,892
Long-term debt	(2,141)
Deferred taxes	(1,936)
Other liabilities	(528)
Cash	399
Fixed assets	429
Fixed assets	2,017
Geoservices [Member]
Preliminary Estimates of the Fair Value of Identifiable Assets Acquired and Liabilities Assumed
Cash	26
Fixed assets	75
Goodwill	658
Intangible assets	377
Long-term debt	(145)
Deferred taxes	(68)
Other liabilities	(158)
Total	915	$ 915
Cash	26
Fixed assets	$ 75

Acquisitions (Details 3) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Acquisitions (Details 3) - USD ($) $ in Millions	Sep. 30, 2010	Dec. 31, 2009	Dec. 31, 2011	Aug. 27, 2010	Apr. 23, 2010
Business Acquisition [Line Items]
Common stock equity consideration				$ (9,812)
Geoservices [Member]
Business Acquisition [Line Items]
Purchase price			$ 915		$ 915
Smith International Incorporate [Member]
Business Acquisition [Line Items]
Smith Reported Revenue	$ 6,000	$ 8,200

Acquisitions (Details 4) - USD ($) $ in Millions	12 Months Ended
Acquisitions (Details 4) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Acquisitions (Textual) [Abstract]
Acquisitions and minority interest investments, net of cash acquired	$ 610	$ 212	$ 514

Acquisitions (Details Textual) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2010 USD ($)	Dec. 31, 2011 USD ($) Year $ / shares shares	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Apr. 23, 2010 USD ($) Year
Business Acquisition [Line Items]
weighted-average life in years \| Year		21
Ownership Interest in Joint Venture		100.00%
Acquisitions (Textual) [Abstract]
Under merger agreement, shares of Schlumberger in exchange for each Smith share \| $ / shares		$ 0.6966
Smith stock options converted to Schlumberger stock options \| shares		0.6
Increase goodwill		$ 194
Goodwill deductible for income tax purposes		200
Acquired Inventory write-up		155
Increase (Decrease) in Notes Payable		417
Acquisitions and minority interest investments, net of cash acquired		610	$ 212	$ 514
Equity Income from joint venture			78	131	$ 210
Gain on Earnings on Equity Interest in Joint Venture Pretax		1,300
Gain on Earnings on Equity Interest in Joint Venture After Tax		$ 1,200
Equity Method Investment Dividends or Distributions			50	106
Tradenames [Member]
Business Acquisition [Line Items]
weighted-average life in years \| Year		25
Technology/Technical Know-How [Member]
Business Acquisition [Line Items]
weighted-average life in years \| Year		16
Customer Relationships [Member]
Business Acquisition [Line Items]
weighted-average life in years \| Year		23
6.75% Senior Notes due 2011 [Member]
Business Acquisition [Line Items]
Notes Payable		$ 220
Debt instrument interest rate		6.75%
Debt Instrument, Maturity Date		Dec. 31, 2011
8.625% Senior Notes due 2014 [Member]
Business Acquisition [Line Items]
Notes Payable		$ 300
Debt instrument interest rate		8.625%
Debt Instrument, Maturity Date		Dec. 31, 2014
6.00% Senior Notes due 2016 [Member]
Business Acquisition [Line Items]
Notes Payable		$ 275
Debt instrument interest rate		6.00%
Debt Instrument, Maturity Date		Dec. 31, 2016
9.75% Senior Notes due 2019 [Member]
Business Acquisition [Line Items]
Notes Payable		$ 700
Debt instrument interest rate		9.75%
Debt Instrument, Maturity Date		Dec. 31, 2019
Parent Company [Member]
Business Acquisition [Line Items]
Ownership Interest in Joint Venture		40.00%
Smith International Incorporate [Member]
Business Acquisition [Line Items]
Smith contributed revenue			3,300
Smith contributed net income			$ 160
Smith Reported Revenue	$ 6,000			$ 8,200
Ownership Interest in Joint Venture		60.00%
Geoservices [Member]
Business Acquisition [Line Items]
Purchase price		$ 915				$ 915
Intangible Assets Estimated Useful Life \| Year						17

Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Inventory
Raw materials & field materials	$ 2,066	$ 1,833
Work in process	364	249
Finished goods	2,270	1,722
Inventories	$ 4,700	$ 3,804

Fixed Assets (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment
Land	$ 362	$ 314
Buildings & improvements	2,912	2,631
Machinery & equipment	24,404	21,873
Seismic vessels	1,873	1,861
Property, plant and equipment	29,551	26,679
Less: Accumulated depreciation	16,558	14,608
Fixed assets less accumulated depreciation	$ 12,993	$ 12,071

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

Fixed Assets (Details Textual) $ in Billions	12 Months Ended
Fixed Assets (Details Textual) $ in Billions	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Fixed Assets (Textual) [Abstract]
Depreciation expense relating to fixed assets	$ 2.7	$ 2.4	$ 2.1
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Minimum useful life	30
Maximum useful life	40
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Minimum useful life	5
Maximum useful life	10
Seismic Vessels [Member]
Property, Plant and Equipment [Line Items]
Minimum useful life	20
Maximum useful life	30

Multiclient Seismic Data (Details) - USD ($) $ in Millions	12 Months Ended
Multiclient Seismic Data (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Multiclient Seismic Data
Balance at beginning of year	$ 394	$ 288
Capitalized in year	289	326
Charged to expense	(258)	(220)
Balance at end of year	$ 425	$ 394

Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Schedule of Goodwill
Balance at January 1, 2011	$ 13,952	$ 5,305
Adjustments relating to Smith acquisition	194
Other acquisitions	87
Divestiture of business	(51)
Impact of changes in exchange rates	(28)	(6)
Balance at December 31, 2011	14,154	13,952
Reservoir Characterization [Member]
Schedule of Goodwill
Balance at January 1, 2011	3,381
Other acquisitions	42
Divestiture of business	(51)
Impact of changes in exchange rates	(12)
Balance at December 31, 2011	3,360	3,381
Drilling [Member]
Schedule of Goodwill
Balance at January 1, 2011	8,150
Adjustments relating to Smith acquisition	175
Other acquisitions	45
Impact of changes in exchange rates	(8)
Balance at December 31, 2011	8,362	8,150
Reservoir Production [Member]
Schedule of Goodwill
Balance at January 1, 2011	2,351
Adjustments relating to Smith acquisition	13
Impact of changes in exchange rates	(8)
Balance at December 31, 2011	2,356	2,351
Distribution [Member]
Schedule of Goodwill
Balance at January 1, 2011	70
Adjustments relating to Smith acquisition	6
Balance at December 31, 2011	$ 76	$ 70

Goodwill (Details 1) - USD ($) $ in Millions	12 Months Ended
Goodwill (Details 1) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in the carrying amount of goodwill
Balance, January 1, 2010	$ 14,154	$ 13,952	$ 5,305
Acquisition of Smith		7,892
Other additions		761
Impact of changes in exchange rates	(28)	(6)
Balance, December 31, 2010	$ 14,154	$ 13,952	$ 5,305

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

The increase (decrease) in the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Subparagraph e
-Paragraph 45
-Clause 6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Subparagraph e
-Paragraph 45
-Clause 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Subparagraph e
-Paragraph 45
-Clause 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Gross book value and accumulated amortization of intangible assets
Gross Book Value	$ 5,862	$ 5,865
Accumulated Amortization	980	703
Intangible Assets, Net (Excluding Goodwill), Total	4,882	5,162
Technology/Technical Know-How [Member]
Gross book value and accumulated amortization of intangible assets
Gross Book Value	1,875	1,846
Accumulated Amortization	341	215
Intangible Assets, Net (Excluding Goodwill), Total	1,534	1,631
Tradenames [Member]
Gross book value and accumulated amortization of intangible assets
Gross Book Value	1,677	1,678
Accumulated Amortization	131	61
Intangible Assets, Net (Excluding Goodwill), Total	1,546	1,617
Customer Relationships [Member]
Gross book value and accumulated amortization of intangible assets
Gross Book Value	1,954	1,963
Accumulated Amortization	209	129
Intangible Assets, Net (Excluding Goodwill), Total	1,745	1,834
Other [Member]
Gross book value and accumulated amortization of intangible assets
Gross Book Value	356	378
Accumulated Amortization	299	298
Intangible Assets, Net (Excluding Goodwill), Total	$ 57	$ 80

Intangible Assets (Details 1) $ in Millions	12 Months Ended
Intangible Assets (Details 1) $ in Millions	Dec. 31, 2011 USD ($) Year	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Intangible Assets - Additional Information
Amortization expense on intangible assets excluding goodwill	$ 325	$ 190	$ 114
Weighted Average Amortization Period for all Intangible Assets (Years) \| Year	21
Estimated amortization charged to income, 2012	$ 323
Estimated amortization charged to income, 2013	304
Estimated amortization charged to income, 2014	298
Estimated amortization charged to income, 2015	287
Estimated amortization charged to income, 2016	$ 268

Long-term Debt and Debt Facility Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Summary of Long-Term Debt
Long-term debt, carrying amount	$ 8,548	$ 5,504
Fair value adjustment-hedging	8	13
Other Long-term Debt, Noncurrent, Total	8,556	5,517
Commercial paper borrowings [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	0	367
Other variable rate debt [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	271	133
3.300% Senior Notes due 2021 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	1,595	0
4.50% Guaranteed Notes due 2014 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	1,297	1,319
2.75% Guaranteed Notes due 2015 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	1,290	1,310
1.950% Senior Notes due 2016 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	1,099	0
4.200% Guaranteed Notes due 2021 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	1,099	0
5.25% Guaranteed Notes due 2013 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	649	659
2.650% Guaranteed Notes due 2016 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	498	0
3.00% Guaranteed Notes due 2013 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	450	450
Floating Rate Senior Notes due 2014 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	300	0
9.75% Senior Notes due 2019 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	0	776
8.625% Senior Notes due 2014 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	0	272
6.00% Senior Notes due 2016 [Member]
Summary of Long-Term Debt
Long-term debt, carrying amount	$ 0	$ 218

Long-term Debt and Debt Facility Agreements (Details 1) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Summary of other long term debt by currency
Long-term Debt	$ 8,556	$ 5,517
Bonds and Notes [Member]
Summary of other long term debt by currency
Long-term Debt	8,285	5,017
Commercial Paper [Member]
Summary of other long term debt by currency
Long-term Debt	0	367
Debt, Other [Member]
Summary of other long term debt by currency
Long-term Debt	271	133
United States Dollar [Member]
Summary of other long term debt by currency
Long-term Debt	7,834	5,121
United States Dollar [Member] \| Bonds and Notes [Member]
Summary of other long term debt by currency
Long-term Debt	7,787	5,017
United States Dollar [Member] \| Debt, Other [Member]
Summary of other long term debt by currency
Long-term Debt	47	104
Euro [Member]
Summary of other long term debt by currency
Long-term Debt	649	183
Euro [Member] \| Bonds and Notes [Member]
Summary of other long term debt by currency
Long-term Debt	498
Euro [Member] \| Commercial Paper [Member]
Summary of other long term debt by currency
Long-term Debt	0	183
Euro [Member] \| Debt, Other [Member]
Summary of other long term debt by currency
Long-term Debt	151
Norwegian Kroner [Member]
Summary of other long term debt by currency
Long-term Debt	16	17
Norwegian Kroner [Member] \| Debt, Other [Member]
Summary of other long term debt by currency
Long-term Debt	16	17
Pound Sterling [Member]
Summary of other long term debt by currency
Long-term Debt		184
Pound Sterling [Member] \| Commercial Paper [Member]
Summary of other long term debt by currency
Long-term Debt	0	184
Other Currency [Member]
Summary of other long term debt by currency
Long-term Debt	57	12
Other Currency [Member] \| Debt, Other [Member]
Summary of other long term debt by currency
Long-term Debt	$ 57	$ 12

Long-term Debt and Debt Facility Agreements (Details Textual) $ / shares in Units, shares in Millions, € in Billions	3 Months Ended		9 Months Ended	12 Months Ended				15 Months Ended
	Mar. 31, 2011 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($) shares	Dec. 31, 2009 USD ($)	Dec. 31, 2003 USD ($) $ / shares	Dec. 31, 2011 USD ($)	Dec. 31, 2011 EUR (€)	Dec. 31, 2011 USD ($)	Dec. 27, 2011 EUR (€)	Dec. 27, 2011 USD ($)	Dec. 31, 2010 EUR (€)	Dec. 31, 2010 USD ($)	Sep. 30, 2009 USD ($)
Long-term Debt Additional (Textual) [Abstract]
Committed debt facility agreement aggregated										$ 4,100,000,000
Commercial paper borrowings										1,041,000,000				$ 2,214,000,000
Repayment of long-term debt				$ 4,992,000,000	$ 1,814,000,000	$ 1,754,000,000
Long-term debt, carrying amount										8,548,000,000				5,504,000,000
Long-term Debt (Textual) [Abstract]
Repurchase of senior notes	$ 1,260,000,000
Long-term debt, fair value										8,900,000,000				5,600,000,000
Unused debt facility										$ 2,800,000,000
Weighted average interest rate on variable rate debt									2.80%	2.80%
Long-term debt maturity in 2013										$ 1,168,000,000
Long-term debt maturity in 2014										1,605,000,000
Long-term debt maturity in 2015										1,297,000,000
Long-term debt maturity in 2016										1,792,000,000
Long-term debt maturity after 2016										2,694,000,000
Debentures converted in to common shares					$ 320,000,000
Shares of common stock converted from debentures \| shares					8.0
Debentures redeemed for cash					$ 1,000,000
Commercial Paper [Member]
Long-term Debt Additional (Textual) [Abstract]
Unused committed credit facilities maturity				more than one year
Committed debt facility agreement aggregated										3,500,000,000
Committed facilities included in debt facility, maturity				Jul. 12, 2012
Commercial paper borrowings										900,000,000				1,900,000,000
Commercial paper borrowings										900,000,000
Long-term debt, carrying amount										0				367,000,000
Commercial Paper Programs Maturing December 2012 [Member]
Long-term Debt Additional (Textual) [Abstract]
Committed debt facility agreement aggregated										500,000,000
Commercial paper programs maturing July 2016 [Member]
Long-term Debt Additional (Textual) [Abstract]
Committed debt facility agreement aggregated										$ 3,000,000,000
4.50% Guaranteed Notes due 2014 [Member]
Long-term Debt Additional (Textual) [Abstract]
Guaranteed notes face amount \| €											€ 1.0
Debt instrument interest rate									4.50%	4.50%
Effective interest rate on euro denominated debt											4.95%	4.95%
Long-term debt, carrying amount										$ 1,297,000,000				1,319,000,000
2.75% Guaranteed Notes due 2015 [Member]
Long-term Debt Additional (Textual) [Abstract]
Guaranteed notes face amount \| €													€ 1.0
Debt instrument interest rate									2.75%	2.75%
Effective interest rate on euro denominated debt									2.56%	2.56%
Long-term debt, carrying amount										$ 1,290,000,000				1,310,000,000
4.200% Guaranteed Notes due 2021 [Member]
Long-term Debt Additional (Textual) [Abstract]
Guaranteed notes face amount	1,100,000,000
Debt instrument interest rate									4.20%	4.20%
Long-term debt, carrying amount										$ 1,099,000,000				0
5.25% Guaranteed Notes due 2013 [Member]
Long-term Debt Additional (Textual) [Abstract]
Debt instrument interest rate									5.25%	5.25%
Long-term debt, carrying amount										$ 649,000,000				659,000,000
2.650% Guaranteed Notes due 2016 [Member]
Long-term Debt Additional (Textual) [Abstract]
Guaranteed notes face amount	$ 500,000,000
Debt instrument interest rate									2.65%	2.65%
Effective interest rate on euro denominated debt	2.39%
Long-term debt, carrying amount										$ 498,000,000				0
3.00% Guaranteed Notes due 2013 [Member]
Long-term Debt Additional (Textual) [Abstract]
Guaranteed notes face amount												$ 450,000,000			$ 450,000,000
Debt instrument interest rate									3.00%	3.00%
Long-term debt, carrying amount										$ 450,000,000				450,000,000
9.75% Senior Notes due 2019 [Member]
Long-term Debt Additional (Textual) [Abstract]
Debt instrument interest rate									9.75%	9.75%
Long-term debt, carrying amount										$ 0				776,000,000
8.625% Senior Notes due 2014 [Member]
Long-term Debt Additional (Textual) [Abstract]
Debt instrument interest rate									8.625%	8.625%
Long-term debt, carrying amount										$ 0				272,000,000
6.00% Senior Notes due 2016 [Member]
Long-term Debt Additional (Textual) [Abstract]
Debt instrument interest rate									6.00%	6.00%
Long-term debt, carrying amount										$ 0				218,000,000
1.950% Senior Notes due 2016 [Member]
Long-term Debt Additional (Textual) [Abstract]
Debt instrument interest rate									1.95%	1.95%
face amount of debt instrument			$ 1,100,000,000
Long-term debt, carrying amount										$ 1,099,000,000				0
3.300% Senior Notes due 2021 [Member]
Long-term Debt Additional (Textual) [Abstract]
Debt instrument interest rate									3.30%	3.30%
face amount of debt instrument			1,600,000,000
Long-term debt, carrying amount										$ 1,595,000,000				0
Notes 6.50% Due 2012 [Member]
Long-term Debt Additional (Textual) [Abstract]
Guaranteed notes face amount										650,000,000
Debt instrument interest rate		6.50%
Repayment of long-term debt		$ 650,000,000						$ 650,000,000
2.125% Series B Convertible Debentures due June 1, 2023 [Member]
Long-term Debt Additional (Textual) [Abstract]
Guaranteed notes face amount							$ 450,000,000
Convertible no shares per conversion rate							25.000
Principal amount of convertible debentures							$ 1,000
Per share conversion rate \| $ / shares							$ 40.00
2.125% Series B Convertible Debentures due June 1, 2023, outstanding						$ 321,000,000
Euro medium term note program [Member]
Long-term Debt Additional (Textual) [Abstract]
Guaranteed notes face amount \| €									€ 3.0
Floating Rate Senior Notes due 2014 [Member]
Long-term Debt Additional (Textual) [Abstract]
face amount of debt instrument			$ 300,000,000
Basis Point over LIBOR			0.50%
Long-term debt, carrying amount										$ 300,000,000				$ 0

Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Derivative assets
Derivative assets	$ 32	$ 76
Derivative Liabilities
Derivative Liabilities	189	107
Designated as Hedging Instrument [Member]
Derivative assets
Derivative assets	15	55
Derivative Liabilities
Derivative Liabilities	177	93
Nondesignated [Member]
Derivative assets
Derivative assets	17	21
Derivative Liabilities
Derivative Liabilities	12	14
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivative assets
Derivative assets	2	4
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivative assets
Derivative assets	4	37
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	47	9
Foreign Exchange Contract [Member] \| Designated as Hedging Instrument [Member] \| Other Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	130	77
Foreign Exchange Contract [Member] \| Nondesignated [Member] \| Other Current Assets [Member]
Derivative assets
Derivative assets	8	9
Foreign Exchange Contract [Member] \| Nondesignated [Member] \| Other Assets [Member]
Derivative assets
Derivative assets	9	9
Foreign Exchange Contract [Member] \| Nondesignated [Member] \| Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	9	14
Interest Rate Contract [Member] \| Designated as Hedging Instrument [Member] \| Other Assets [Member]
Derivative assets
Derivative assets	9	14
Interest Rate Contract [Member] \| Designated as Hedging Instrument [Member] \| Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	0	7
Commodity Contract [Member] \| Nondesignated [Member] \| Other Current Assets [Member]
Derivative assets
Derivative assets	0	3
Commodity Contract [Member] \| Nondesignated [Member] \| Accounts Payable and Accrued Liabilities [Member]
Derivative Liabilities
Derivative Liabilities	$ 3	$ 0

Derivative Instruments and Hedging Activities (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commodity Contract [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Commodity forward contract outstanding	$ 27
Fair Value Hedging [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	9	$ 14	$ 111
Fair Value Hedging [Member] \| Foreign Exchange Contract [Member] \| Cost of revenue - Oilfield Services [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income		(8)	105
Fair Value Hedging [Member] \| Interest Rate Contract [Member] \| Interest expense [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	9	22	6
Nondesignated [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	(22)	(12)	34
Nondesignated [Member] \| Foreign Exchange Contract [Member] \| Cost of revenue - Oilfield Services [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	(17)	(13)	32
Nondesignated [Member] \| Commodity Contract [Member] \| Cost of revenue - Oilfield Services [Member]
Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income
Gain/(loss) recognized in income	$ (5)	$ 1	$ 2

Derivative Instruments and Hedging Activities (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gain (loss) reclassified from accumulated OCI into income	$ (8)	$ (274)	$ 80
Foreign Exchange Contract [Member] \| Cost of revenue - Oilfield Services [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gain (loss) reclassified from accumulated OCI into income	(25)	(260)	95
Foreign Exchange Contract [Member] \| Research and Development Expense [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Gain (loss) reclassified from accumulated OCI into income	$ 17	$ (14)	$ (15)

Derivative Instruments and Hedging Activities (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Foreign Exchange Contract [Member]
Effect of derivative instruments in cash flow hedging relationships on income and other comprehensive income (OCI)
Gain (loss) recognized in OCI	$ 79	$ (269)	$ 223

Derivative Instruments and Hedging Activities (Details 4) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) Country	Dec. 27, 2011 USD ($)	Sep. 30, 2009 USD ($)
Derivative Instruments and Hedging Activities (Textual) [Abstract]
Number of countries in which Schlumberger conducts business \| Country	85
Recognized a cumulative net gain in Equity relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges	$ 26
Contracts outstanding in various foreign currencies (US dollar equivalent)	6,900
Contracts outstanding in various foreign currencies related to hedges of debt denominated in currencies other than the functional currency	3,900
Fixed rate debt aggregate, after taking into account the effects of the interest rate swaps	7,500
Variable rate debt aggregate, after taking into account the effects of the interest rate swaps	$ 2,400
Percentage of revenue denominated in US dollar	75.00%
3.00% Guaranteed Notes due 2013 [Member]
Derivative [Line Items]
Notional amount of interest rate swap			$ 450
Notes relating to interest rate swap		$ 450	$ 450
3.00% Guaranteed Notes due 2013 [Member] \| Fixed Rate Debt [Member]
Derivative [Line Items]
Derivative swap interest rate			3.00%
3.00% Guaranteed Notes due 2013 [Member] \| Floating Rate Debt [Member]
Derivative [Line Items]
Derivative swap interest rate			0.765%
Notes 6.50% Due 2012 [Member]
Derivative [Line Items]
Notional amount of interest rate swap	$ 600
Notes relating to interest rate swap	650
Repurchase of interest rate derivative	$ 10
Notes 6.50% Due 2012 [Member] \| Fixed Rate Debt [Member]
Derivative [Line Items]
Derivative swap interest rate	6.50%
Notes 6.50% Due 2012 [Member] \| Floating Rate Debt [Member]
Derivative [Line Items]
Derivative swap interest rate	4.84%

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Aug. 27, 2010	Dec. 31, 2009
Schedule of accumulated other comprehensive loss
Accumulated other comprehensive loss	$ (3,557)	$ (2,768)		$ (2,674)
Stockholders Equity (Textual) [Abstract]
Common stock, shares authorized	4,500,000,000
Common stock, par value	$ 0.01
Common stock, shares outstanding	1,333,775,406	1,361,171,428	248,000,000
Preferred stock, shares authorized	200,000,000
Preferred stock, par value	$ 0.01
Preferred stock, issued	0
Currency Translation Adjustments [Member]
Schedule of accumulated other comprehensive loss
Accumulated other comprehensive loss	$ (993)	$ (912)		(886)
Deferred Employee Benefits Liabilities [Member]
Schedule of accumulated other comprehensive loss
Accumulated other comprehensive loss	(2,538)	(1,901)		(1,828)
Fair Value of Derivatives [Member]
Schedule of accumulated other comprehensive loss
Accumulated other comprehensive loss	$ (26)	$ 45		$ 40

Stock Compensation Plans (Details)	12 Months Ended
Stock Compensation Plans (Details)	Dec. 31, 2011 Year $ / shares	Dec. 31, 2010 Year $ / shares	Dec. 31, 2009 Year $ / shares
Weighted-average assumptions
Dividend yield	1.20%	1.30%	1.20%
Expected volatility	37.00%	35.00%	34.00%
Risk free interest rate	2.80%	2.90%	2.20%
Expected option life in years \| Year	6.9	6.9	6.9
Weighted-average fair value per share \| $ / shares	$ 31.38	$ 24.13	$ 13.92

Stock Compensation Plans (Details 1) shares in Thousands	12 Months Ended
Stock Compensation Plans (Details 1) shares in Thousands	Dec. 31, 2011 Year $ / shares shares
Options outstanding and options exercisable
Options Outstanding \| shares	40,027
Weighted-average remaining contractual life (in years) \| Year	6.64
Weighted-average exercise price	$ 63.84
Options Exercisable \| shares	16,886
Weighted-average exercise price	$ 55.49
Exercise prices range $19.04 - $32.46 [Member]
Options outstanding and options exercisable
Exercise prices minimum range	19.04
Exercise prices maximum range	$ 32.46
Options Outstanding \| shares	2,764
Weighted-average remaining contractual life (in years) \| Year	0.99
Weighted-average exercise price	$ 27.35
Options Exercisable \| shares	2,764
Weighted-average exercise price	$ 27.35
Exercise prices range $32.62 - $37.85 [Member]
Options outstanding and options exercisable
Exercise prices minimum range	32.62
Exercise prices maximum range	$ 37.85
Options Outstanding \| shares	5,921
Weighted-average remaining contractual life (in years) \| Year	6.67
Weighted-average exercise price	$ 37.43
Options Exercisable \| shares	2,109
Weighted-average exercise price	$ 36.69
Exercise prices range $39.08 - $55.69 [Member]
Options outstanding and options exercisable
Exercise prices minimum range	39.08
Exercise prices maximum range	$ 55.69
Options Outstanding \| shares	6,116
Weighted-average remaining contractual life (in years) \| Year	5.00
Weighted-average exercise price	$ 52.71
Options Exercisable \| shares	4,929
Weighted-average exercise price	$ 53.45
Exercise prices range $56.61 - $74.00 [Member]
Options outstanding and options exercisable
Exercise prices minimum range	56.61
Exercise prices maximum range	$ 74.00
Options Outstanding \| shares	11,223
Weighted-average remaining contractual life (in years) \| Year	7.19
Weighted-average exercise price	$ 65.09
Options Exercisable \| shares	4,199
Weighted-average exercise price	$ 62.50
Exercise prices range $83.89 - $110.78 [Member]
Options outstanding and options exercisable
Exercise prices minimum range	83.89
Exercise prices maximum range	$ 110.78
Options Outstanding \| shares	14,003
Weighted-average remaining contractual life (in years) \| Year	8.02
Weighted-average exercise price	$ 86.08
Options Exercisable \| shares	2,885
Weighted-average exercise price	$ 89.48

Stock Compensation Plans (Details 2) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Option Activity
Beginning balance, shares	37,499	35,500	32,301
Weighted-average exercise price, beginning balance	$ 55.33	$ 50.30	$ 50.36
Granted, shares	9,528	8,283	7,981
Granted, Weighted-average exercise price	$ 84.29	$ 66.67	$ 40.87
Assumed in Smith transaction, shares		581
Assumed in Smith transaction, Weighted-average exercise price		$ 28.77
Exercised, shares	6,000	6,000	4,000
Exercised, Weighted-average exercise price	$ 42.36	$ 37.60	$ 29.00
Forfeited, shares	(1,530)	(903)	(931)
Forfeited, Weighted-average exercise price	$ 58.82	$ 61.28	$ 58.82
Ending balance, shares	40,027	37,499	35,500
Weighted-average exercise price, end of period	$ 63.84	$ 55.33	$ 50.30

Stock Compensation Plans (Details 3) - Restricted Stock [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted stock transactions
Unvested at beginning of year, Restricted Stock	2,223	1,343	1,701
Unvested at beginning of year, Weighted Average Grant date Fair Value	$ 64.27	$ 62.75	$ 66.49
Granted, Restricted Stock	1,136	1,261	304
Granted, Weighted Average Grant Date Fair Value	$ 84.61	$ 65.79	$ 48.14
Vested, Restricted Stock	(767)	(286)	(580)
Vested, Weighted Average Grant Date Fair Value	$ 67.36	$ 63.92	$ 65.15
Forfeited, Restricted Stock	(159)	(95)	(82)
Forfeited, Weighted Average Grant Date Fair Value	$ 72.51	$ 64.16	$ 69.23
Unvested at end of year, Restricted Stock	2,433	2,223	1,343
Unvested at end of year, Weighted Average Grant date Fair Value	$ 72.25	$ 64.27	$ 62.75

Stock Compensation Plans (Details 4) - $ / shares	12 Months Ended
Stock Compensation Plans (Details 4) - $ / shares	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Discounted Stock Purchase Plan Assumptions And Resulting Weighted Average Fair Value
Dividend yield	1.20%	1.30%	1.20%
Expected volatility	37.00%	35.00%	34.00%
Risk free interest rate	2.80%	2.90%	2.20%
Weighted-average fair value per share	$ 31.38	$ 24.13	$ 13.92
Discounted Stock Purchase Plan [Member]
Discounted Stock Purchase Plan Assumptions And Resulting Weighted Average Fair Value
Dividend yield	1.20%	1.60%	1.10%
Expected volatility	28.00%	36.00%	44.00%
Risk free interest rate	0.20%	0.30%	0.30%
Weighted-average fair value per share	$ 12.83	$ 10.30	$ 9.76

Stock Compensation Plans (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Compensation Plans
Stock-based compensation expense	$ 272	$ 198	$ 186
Stock Options [Member]
Stock Compensation Plans
Stock-based compensation expense	176	121	118
Restricted Stock [Member]
Stock Compensation Plans
Stock-based compensation expense	60	44	32
Discounted Stock Purchase Plan [Member]
Stock Compensation Plans
Stock-based compensation expense	$ 36	$ 33	$ 36

Stock Compensation Plans (Details Textual) $ in Millions	12 Months Ended
Stock Compensation Plans (Details Textual) $ in Millions	Dec. 31, 2011 USD ($) Year	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Additional Stock Based Compensation (Textual) [Abstract]
The aggregate intrinsic value of stock options outstanding	$ 428
The aggregate intrinsic value of stock options exercisable	278
The total intrinsic value of options exercised	246	$ 188	$ 103
Expected to be recognized in 2012	218
Expected to be recognized in 2013	152
Expected to be recognized in 2014	101
Expected to be recognized in 2015	53
Expected to be recognized in 2016	3
Total unrecognized compensation cost related to nonvested stock-based compensation arrangements	$ 527
Stock Options [Member]
Stock Based Compensation (Textual) [Abstract]
Stock Option Maximum Term	10 years
Stock Options vesting period	Four or Five Years
Weighted average remaining contractual life of stock options exercisable, in years \| Year	4.7
Restricted Stock [Member]
Stock Based Compensation (Textual) [Abstract]
Restricted stock awards, vesting period	3 years
Discounted Stock Purchase Plan [Member]
Stock Based Compensation (Textual) [Abstract]
Percentage Purchase Price of stock lower of stock price at beginning or end of plan period at specified Intervals	92.50%

Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
Income Tax (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income from before taxes subject to US and Non-US Income Taxes
United States	$ 2,325	$ 638	$ 86
Outside United States	4,013	4,518	3,848
Income (Loss) from Continuing Operations before Income Taxes and Minority Interest, Total	$ 6,338	$ 5,156	$ 3,934

Income Tax (Details 1) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Components of Net Deferred Tax Assets
Postretirement benefits	$ 440	$ 327
Intangible assets	(1,498)	(1,674)
Investments in non-US Subsidiaries	(349)	(353)
Other, net	132	115
Deferred Tax Assets, Net, Total	$ (1,275)	$ (1,585)

The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from postretirement benefits, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

Schedule of Segment Reporting Information, by Segment

Income Tax (Details 2) - USD ($) $ in Millions	12 Months Ended
Income Tax (Details 2) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
United States - Federal	$ 842	$ 76	$ (191)
United States - State	45	14	(6)
Outside United States	693	909	594
Current Income Tax Expense (Benefit), Total	1,580	999	397
Deferred:
United States - Federal	(80)	183	247
United States - State	(7)	2	13
Outside United States	73	(281)	86
Valuation allowance	(21)	(13)	27
Deferred income taxes	(35)	(109)	373
Consolidated taxes on income	$ 1,545	$ 890	$ 770

Income Tax (Details 3)	12 Months Ended
Income Tax (Details 3)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of the US statutory federal tax rate to the consolidated effective income tax rate
US statutory federal rate	35.00%	35.00%	35.00%
Non-US income taxed at different rates	(10.00%)	(14.00%)	(16.00%)
Charges and credits (See Note 3)		(3.00%)	1.00%
Other	(1.00%)	(1.00%)
Effective income tax rate	24.00%	17.00%	20.00%

Income Tax (Details 4) - USD ($) $ in Millions	12 Months Ended
Income Tax (Details 4) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of the liabilities associated with uncertain tax provisions
Balance at beginning of year	$ 1,338	$ 1,026	$ 877
Additions based on tax positions related to the current year	153	190	178
Additions for tax positions of prior years	49	8	36
Additions related to acquisitions	48	115
Impact of changes in exchange rates	(18)	(3)	39
Settlements with tax authorities	(77)	(36)	(16)
Reductions for tax positions of prior years	(102)	(99)	(68)
Reductions due to the lapse of the applicable statute of limitations	(38)	(36)	(20)
Balance at end of year	$ 1,353	$ 1,338	$ 1,026

Income Tax (Details 5)	12 Months Ended
Income Tax (Details 5)	Dec. 31, 2011
Brazil [Member]
Income Tax Examination
Income Tax Examination, Year(s) under Examination	2005 - 2011
Canada [Member]
Income Tax Examination
Income Tax Examination, Year(s) under Examination	2004 - 2011
Mexico [Member]
Income Tax Examination
Income Tax Examination, Year(s) under Examination	2006 - 2011
Norway [Member]
Income Tax Examination
Income Tax Examination, Year(s) under Examination	2003 - 2011
Russia [Member]
Income Tax Examination
Income Tax Examination, Year(s) under Examination	2008 - 2011
Saudi Arabia [Member]
Income Tax Examination
Income Tax Examination, Year(s) under Examination	2001 - 2011
United Kingdom [Member]
Income Tax Examination
Income Tax Examination, Year(s) under Examination	2009 - 2011
United States [Member]
Income Tax Examination
Income Tax Examination, Year(s) under Examination	2005 - 2011

Income Tax (Details Textual) $ in Millions	12 Months Ended
Income Tax (Details Textual) $ in Millions	Dec. 31, 2011 USD ($) Jurisdictions	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Income Tax (Textual) [Abstract]
Charges Pretax	$ 225	$ 621	$ 238
US statutory federal rate	35.00%	35.00%	35.00%
Income Tax (Additional Textual) [Abstract]
Minimum number of jurisdictions to Schlumberger operates \| Jurisdictions	100
Deferred tax assets, valuation allowances relating to net operating losses in certain countries	$ 239	$ 263
Accrued interest and penalties	225	210	$ 168
Recognized interest and penalties	$ 15	42	32
Minimum [Member]
Income Tax (Textual) [Abstract]
US statutory federal rate	0.00%
Maximum [Member]
Income Tax (Textual) [Abstract]
US statutory federal rate	50.00%
Domestic Country [Member]
Income Tax (Textual) [Abstract]
Charges Pretax	$ 106	226	73
Foreign Country [Member]
Income Tax (Textual) [Abstract]
Charges Pretax	$ 119	$ 847	$ 165

Leases and Lease Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Future minimum rental commitments under noncancelable operating leases
2012	$ 313
2013	239
2014	181
2015	150
2016	105
Thereafter	441
Total	1,429
Leases and Lease Commitments (Textual) [Abstract]
Total rental expense	$ 1,200	$ 1,200	$ 1,000

Segment Information (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

$ 39,540

$ 27,447

$ 22,702

4,777

4,267

3,156

55,201

51,767

33,465

^[1]

3,281

2,759

2,476

Oilfield Services [Member]

4,016

2,914

2,395

Schedule of Segment Reporting Information, by Segment

36,959

26,673

22,702

7,305

5,071

4,635

26,679

23,748

17,841

3,072

2,680

2,465

Reservoir Characterization [Member]

4,008

2,911

2,390

Schedule of Segment Reporting Information, by Segment

9,929

9,321

9,502

2,449

2,321

2,559

7,621

7,338

7,090

1,285

1,246

1,221

Schedule of Segment Reporting Information, by Segment

1,057

885

1,085

Drilling [Member]

14,248

8,230

5,881

2,275

1,334

1,245

9,268

8,490

3,628

1,026

756

620

Reservoir Production [Member]

1,460

968

470

Schedule of Segment Reporting Information, by Segment

12,748

9,053

7,282

2,616

1,368

780

7,834

6,119

5,006

598

536

503

Eliminations and other [Member]

1,343

824

632

Schedule of Segment Reporting Information, by Segment

(35)

1,956

1,801

2,117

163

142

121

Schedule of Segment Reporting Information, by Segment

148

234

203

Eliminations [Member]

Distribution Net of Eliminations [Member]

(40)

Schedule of Segment Reporting Information, by Segment

2,581

Schedule of Segment Reporting Information, by Segment

103

Distribution [Member]

2,621

774

103

939

780

Goodwill and intangible assets [Member]

Schedule of Segment Reporting Information, by Segment

All other assets [Member]

19,036

19,114

6,091

Schedule of Segment Reporting Information, by Segment

Schedule of Segment Reporting Information, by Segment

2,198

1,580

1,873

Corporate [Member]

(592)

(406)

(327)

6,349

6,545

7,660

203

Schedule of Segment Reporting Information, by Segment

Interest income [Member]

Interest expense [Member]

Schedule of Segment Reporting Information, by Segment

Charges and Credits [Member]

(290)

(202)

(188)

Schedule of Segment Reporting Information, by Segment

$ (225)

$ 621

$ (238)

[1]	Includes multiclient seismic data costs.

Segment Information (Details 1) - USD ($) $ in Millions	12 Months Ended
Segment Information (Details 1) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue by geographic area
Revenue	$ 39,540	$ 27,447	$ 22,702
Fixed Assets less accumulated depreciation by geographic area
Fixed Assets less accumulated depreciation by geographic area	12,993	12,071
Oilfield Services [Member]
Revenue by geographic area
Eliminations & other	407	285	235
Revenue	36,959	26,673	22,702
Fixed Assets less accumulated depreciation by geographic area
Fixed Assets less accumulated depreciation by geographic area	12,993	12,071	9,660
Oilfield Services [Member] \| North America [Member]
Revenue by geographic area
Domestic revenue	12,273	6,729	4,217
Fixed Assets less accumulated depreciation by geographic area
Fixed Assets Domestic	4,220	3,624	2,229
Oilfield Services [Member] \| Latin America [Member]
Revenue by geographic area
Domestic revenue	6,453	4,985	4,552
Fixed Assets less accumulated depreciation by geographic area
Fixed Assets Domestic	1,472	1,274	995
Oilfield Services [Member] \| Europe/CIS/Africa [Member]
Revenue by geographic area
Foreign revenue	9,761	8,024	7,737
Fixed Assets less accumulated depreciation by geographic area
Fixed Assets Foreign	3,324	3,310	2,763
Oilfield Services [Member] \| Middle East & Asia [Member]
Revenue by geographic area
Foreign revenue	8,065	6,650	5,961
Fixed Assets less accumulated depreciation by geographic area
Fixed Assets Foreign	2,233	2,004	1,797
Oilfield Services [Member] \| Unallocated [Member]
Fixed Assets less accumulated depreciation by geographic area
Unallocated	1,744	1,859	$ 1,876
Distribution [Member]
Revenue by geographic area
Revenue	$ 2,581	$ 774

Segment Information (Details 2) - USD ($) $ in Millions	12 Months Ended
Segment Information (Details 2) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Information (Textual) [Abstract]
Interest income included in the segment results	$ 3	$ 7	$ 10
Interest expense included in the segment results	$ 298	$ 207	$ 221
Maximum percentage of consolidated revenue customers	10.00%	10.00%	10.00%
Revenue in the United States	$ 12,700	$ 6,500	$ 3,700
North America [Member]
Segment Reporting Information [Line Items]
Percentage of distribution of revenues generated in North America	99.00%	97.00%

Pension and Other Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
The weighted-average assumed discount rate and compensation increases used to determine the projected benefit obligations for the US and International plans
Discount rate	5.00%	5.50%	7.25%
US [Member]
The weighted-average assumed discount rate, compensation increases and the expected long-term rate of return on plan assets used to determine the net pension cost for the US and International plans
Discount rate	5.50%	6.00%	6.94%
Compensation increases	4.00%	4.00%	4.00%
Return on plan assets	7.50%	8.50%	8.50%
Net Pension Cost for the Schlumberger Pension Plans
Service cost-benefits earned during the period	$ 59	$ 56	$ 52
Interest cost on projected benefit obligation	150	142	143
Expected return on plan assets	(170)	(191)	(166)
Amortization of net loss	90	60	29
Amortization of prior service cost	12	4	5
Total pension cost	141	71	63
Curtailment charge			32
Net pension cost	$ 141	$ 71	$ 95
The weighted-average assumed discount rate and compensation increases used to determine the projected benefit obligations for the US and International plans
Discount rate	5.50%	5.50%
Compensation increases	4.00%	4.00%
International [Member]
The weighted-average assumed discount rate, compensation increases and the expected long-term rate of return on plan assets used to determine the net pension cost for the US and International plans
Discount rate	5.47%	5.89%	6.81%
Compensation increases	4.91%	4.93%	4.93%
Return on plan assets	7.50%	8.00%	8.00%
Net Pension Cost for the Schlumberger Pension Plans
Service cost-benefits earned during the period	$ 64	$ 51	$ 67
Interest cost on projected benefit obligation	226	208	189
Expected return on plan assets	(279)	(228)	(181)
Amortization of net loss	31	19
Amortization of prior service cost	120	113	117
Total pension cost	162	163	192
Curtailment charge			98
Net pension cost	$ 162	$ 163	$ 290
The weighted-average assumed discount rate and compensation increases used to determine the projected benefit obligations for the US and International plans
Discount rate	4.95%	5.47%
Compensation increases	4.91%	4.91%

Pension and Other Benefit Plans (Details 1) - Postretirement Medical Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Periodic Benefit Cost for the Schlumberger US Postretirement Medical Plan
Service cost-benefits earned during the period	$ 24	$ 23	$ 19
Interest Cost on Accumulated Postretirement Benefit Obligation	57	58	56
Expected return on plan assets	(20)	(6)	(2)
Amortization of prior service cost	(12)	(21)	(25)
Amortization of net loss	13	11	3
Total pension cost	$ 62	$ 65	$ 51

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

Pension and Other Benefit Plans (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Contributions to Defined Benefit Pension Plans	$ 165	$ 248

Pension and Other Benefit Plans (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in Projected Benefit Obligations
Contributions by plan participants	$ 6	$ 5
Benefits paid	(40)	(33)
Change in Plan Assets
Plan assets at fair value at beginning of year	290	58
Actual return on plan assets	22	12
Company contributions	165	248
Contributions by plan participants	6	5
Benefits paid	(40)	(33)
Plan assets at fair value at end of year	443	290	$ 58
Unfunded Liability	(745)	(761)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(1,732)	(1,262)
US [Member]
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	2,769	2,439
Service cost	59	56	52
Interest cost	150	142	143
Actuarial losses	225	172
Benefits paid	(130)	(122)
Plan amendments		82
Projected benefit obligation at end of year	3,073	2,769	2,439
Change in Plan Assets
Plan assets at fair value at beginning of year	2,635	2,254
Actual return on plan assets	78	316
Company contributions	72	187
Benefits paid	(130)	(122)
Plan assets at fair value at end of year	2,655	2,635	2,254
Unfunded Liability	(418)	(134)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(418)	(134)
Total of postretirement benefits	(418)	(134)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial losses	1,048	819
Prior service cost	101	114
Total amount recognized in accumulated other comprehensive income	1,149	933
Accumulated benefit obligation	2,861	2,568
International [Member]
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	4,088	3,518
Service cost	64	51	67
Interest cost	226	208	189
Contributions by plan participants	102	76
Actuarial losses	321	310
Currency effect	(8)	(28)
Benefits paid	(127)	(121)
Plan amendments		74
Projected benefit obligation at end of year	4,666	4,088	3,518
Change in Plan Assets
Plan assets at fair value at beginning of year	3,764	2,976
Actual return on plan assets		426
Currency effect	(6)	(26)
Company contributions	364	433
Contributions by plan participants	102	76
Benefits paid	(127)	(121)
Plan assets at fair value at end of year	4,097	3,764	$ 2,976
Unfunded Liability	(569)	(324)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(569)	(367)
Other Assets		43
Total of postretirement benefits	(569)	(324)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial losses	1,002	447
Prior service cost	729	840
Total amount recognized in accumulated other comprehensive income	1,731	1,287
Accumulated benefit obligation	$ 4,336	$ 3,785

Pension and Other Benefit Plans (Details 4)	12 Months Ended
Pension and Other Benefit Plans (Details 4)	Dec. 31, 2011	Dec. 31, 2010
US [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target Allocation Percentage of Assets, Equity Securities, Range Minimum	45.00%
Target Allocation Percentage of Assets, Equity Securities, Range Maximum	50.00%
Equity Securities	47.00%	52.00%
Target Allocation Percentage of Assets, Debt Securities, Range Minimum	33.00%
Target Allocation Percentage of Assets, Debt Securities, Range Maximum	43.00%
Debt Securities	39.00%	40.00%
Target Allocation Percentage of Assets, Cash and Cash Equivalent, Range Minimum	0.00%
Target Allocation Percentage of Assets, Cash and Cash Equivalent, Range Maximum	2.00%
Cash and Cash Equivalents	6.00%	2.00%
Target Allocation Percentage of Assets, Alternative investments, Range Minimum	0.00%
Target Allocation Percentage of Assets, Alternative investments, Range Maximum	10.00%
Alternative investments	8.00%	6.00%
Target Allocation Percentage of Assets, Total	100.00%
Actual Plan Asset Allocations, Total	100.00%	100.00%
International [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target Allocation Percentage of Assets, Equity Securities, Range Minimum		50.00%
Target Allocation Percentage of Assets, Equity Securities, Range Maximum		70.00%
Equity Securities	51.00%	61.00%
Target Allocation Percentage of Assets, Debt Securities, Range Minimum		25.00%
Target Allocation Percentage of Assets, Debt Securities, Range Maximum		35.00%
Debt Securities	38.00%	31.00%
Target Allocation Percentage of Assets, Cash and Cash Equivalent, Range Minimum	0.00%
Target Allocation Percentage of Assets, Cash and Cash Equivalent, Range Maximum	2.00%
Cash and Cash Equivalents	4.00%	3.00%
Target Allocation Percentage of Assets, Alternative investments, Range Minimum		0.00%
Target Allocation Percentage of Assets, Alternative investments, Range Maximum		20.00%
Alternative investments	7.00%	5.00%
Target Allocation Percentage of Assets, Total		100.00%
Actual Plan Asset Allocations, Total	100.00%	100.00%

Pension and Other Benefit Plans (Details 6)	12 Months Ended
Pension and Other Benefit Plans (Details 6)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined benefit plan weighted average assumptions used in calculating benefit obligation and net periodic benefit cost for the postretirement medical plan
Discount Rate, Benefit Obligation	5.00%	5.50%	7.25%
Current medical cost trend rate	8.00%	8.00%
Ultimate medical cost trend rate	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2018	2017
Postretirement Medical Plan [Member]
Defined benefit plan weighted average assumptions used in calculating benefit obligation and net periodic benefit cost for the postretirement medical plan
Discount rate, Net Periodic Benefit Cost	5.50%	6.00%	6.94%
Return on plan assets, Net Periodic Benefit Cost	7.00%	8.00%	8.00%
Current medical cost trend rate	8.00%	8.00%	8.00%
Ultimate medical cost trend rate	5.00%	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2017	2016	2015

Pension and Other Benefit Plans (Details 7) - Postretirement Medical Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net periodic benefit cost for the Schlumberger US postretirement medical plan
Service cost-benefits earned during the period	$ 24	$ 23	$ 19
Interest cost on projected benefit obligation	57	58	56
Expected return on plan assets	(20)	(6)	(2)
Amortization of prior service cost	(12)	(21)	(25)
Amortization of net loss	13	11	3
Total pension cost	62	65	51
Curtailment charge			6
Net pension cost	$ 62	$ 65	$ 57

Pension and Other Benefit Plans (Details 8) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Change in Accumulated Postretirement Benefit Obligation
Contributions by plan participants	$ 6	$ 5
Benefits paid	(40)	(33)
Change in Plan Assets
Plan assets at fair value at beginning of year	290	58
Company contributions	165	248
Contributions by plan participants	6	5
Benefits paid	(40)	(33)
Actual return on plan assets	22	12
Plan assets at fair value at end of year	443	290	$ 58
Unfunded Liability	(745)	(761)
Postretirement Medical Plan [Member]
Change in Accumulated Postretirement Benefit Obligation
Projected benefit obligation at beginning of year	1,051	991
Service cost	24	23	19
Interest cost	57	58	56
Contributions by plan participants	6	4
Actuarial losses	90	8
Benefits paid	(40)	(33)
Projected benefit obligation at end of year	1,188	1,051	$ 991
Change in Plan Assets
Contributions by plan participants	6	4
Benefits paid	(40)	(33)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial losses	286	212
Prior service cost	(24)	(35)
Total amount recognized in accumulated other comprehensive income	$ 262	$ 177

Pension and Other Benefit Plans (Details 9) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
United States Pension Plans of US Entity Defined Benefit [Member]
The expected benefits to be paid under the US and International pension plans and the postretirement medical plan
2012		$ 135
2013		139
2014		143
2015		149
2016		155
2017-2021		911
Defined Benefit Plan, Amounts that will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year
Net actuarial losses	$ 104
Prior service cost (credit)	132
Foreign Pension Plans, Defined Benefit [Member]
The expected benefits to be paid under the US and International pension plans and the postretirement medical plan
2012		156
2013		168
2014		183
2015		197
2016		215
2017-2021		1,250
Postretirement Medical Plan [Member]
Effect of one percentage point change in assumed health care cost trend rates
Effect on total service and interest cost components, One percentage point increase		16
Effect on total service and interest cost components, One percentage point decrease		(13)
Effect on accumulated postretirement benefit obligation, One percentage point increase		196
Effect on accumulated postretirement benefit obligation, One percentage point decrease		(160)
The expected benefits to be paid under the US and International pension plans and the postretirement medical plan
2012		45
2013		49
2014		52
2015		55
2016		59
2017-2021		$ 352
Defined Benefit Plan, Amounts that will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year
Net actuarial losses	18
Prior service cost (credit)	$ (8)

Pension and Other Benefit Plans (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension and Other Benefit Plans (Textual) [Abstract]
Pension and other postretirement benefits curtailment charge	$ 136			$ 136
Anticipated contributions to postretirement benefit plans		$ 600
Pension and Other Benefit Plans (Additional Textual) [Abstract]
Discount Rate, Benefit Obligation		5.00%	5.50%	7.25%
Frequency of asset performance monitored, years		5 years
Expenses for deferred benefit programs		$ 582	$ 403	$ 418
Minimum [Member]
Pension and Other Benefit Plans (Textual) [Abstract]
Range of expected benefits to be paid for the annual pension and postretirement medical plans (net of the annual Medicare Part D subsidy)		3
Maximum [Member]
Pension and Other Benefit Plans (Textual) [Abstract]
Range of expected benefits to be paid for the annual pension and postretirement medical plans (net of the annual Medicare Part D subsidy)		$ 7
Pension Plans, Defined Benefit [Member]
Pension and Other Benefit Plans (Textual) [Abstract]
Pension and other postretirement benefits curtailment charge	130
Postretirement Medical Plan [Member]
Pension and Other Benefit Plans (Textual) [Abstract]
Pension and other postretirement benefits curtailment charge	$ 6
Postretirement Medical Plan [Member] \| U S [Member]
Pension and Other Benefit Plans (Textual) [Abstract]
Investment of assets in US equity securities under US postretirement medical plan		60.00%
Postretirement Medical Plan [Member] \| US Treasury and Government [Member]
Pension and Other Benefit Plans (Textual) [Abstract]
Investment of assets in government and government-related debt securities under US postretirement medical plan		40.00%

Supplementary Information (Details) - USD ($) $ in Millions	12 Months Ended
Supplementary Information (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash paid for interest and income taxes
Interest	$ 294	$ 234	$ 249
Income taxes	1,836	571	$ 665
Accounts payable and accrued liabilities
Payroll, vacation and employee benefits	1,597	1,414
Trade	3,389	2,649
Other	2,593	2,425
Accounts payable and accrued liabilities	$ 7,579	$ 6,488

Supplementary Information (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Interest and other income, net
Interest income	$ 3	$ 7	$ 10
Equity in net earnings of affiliated companies:
M-I SWACO		78	131	$ 210
Other			3
Interest and other income, net	129	214	273
M-I SWACO [Member]
Equity in net earnings of affiliated companies:
M-I SWACO		78	131
Others [Member]
Equity in net earnings of affiliated companies:
Others	$ 89	$ 86	$ 78

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 19
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 6
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.12)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33749-111570

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
-Article 7

Supplementary Information (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for doubtful accounts
Balance at beginning of year	$ 185	$ 160	$ 133
Provision	37	38	54
Amounts written off	(45)	(13)	(27)
Balance at end of year	$ 177	$ 185	$ 160

Supplementary Information (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2011	Dec. 31, 2009
Supplementary Information (Textual) [Abstract]
Proceeds from divestiture of global connectivity services business in cash	$ 385
Gain on divestiture of global connectivity services business after tax	$ 220
Charge related to the resolution of a custom assessment and contingency		$ 22

Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.