Statement [Table] Statement [Line Items] Document Type Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Amendment Flag Entity Filer Category Entity Common Stock, Shares Outstanding CONSOLIDATED STATEMENT OF INCOME [Abstract] Revenues Revenues, Total Revenue Interest Income And Other Interest and other income, net Interest & other income, net Includes operating interest income earned as part of a core business activity, equity income representing the undistributed income or loss of investments which are accounted for under the equity method of accounting, and other miscellaneous income or loss earned from core business activities. Expenses Research & engineering Research and Development Expense, Total Research & engineering General & administrative General and Administrative Expense, Total General & administrative Interest Interest Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Income before taxes Taxes on income Consolidated taxes on income Taxes on income Profit Loss Net income Net Income Net Income Net Income Loss Attributable To Noncontrolling Interest Net income attributable to noncontrolling interests Net loss (income) attributable to noncontrolling interests Net loss (income) attributable to noncontrolling interests Net Income Loss Net Income attributable to Schlumberger Net Income Earnings Per Share Basic Net Income Basic earnings per share of Schlumberger Diluted Net Income Diluted earnings per share of Schlumberger Average shares outstanding Average shares outstanding: Weighted Average Number Of Shares Outstanding Basic Weighted Average Number of Shares Outstanding, Basic, Total Basic Assuming dilution Assuming dilution CONSOLIDATED BALANCE SHEET [Abstract] Assets Abstract ASSETS ASSETS Current Assets Current Assets Cash Cash Short-term investments Short-term Investments, Total Short-term investments Receivables, Net, Current Receivables, Net, Current, Total Receivables less allowance for doubtful accounts (2011 - $177; 2010 - $185) Inventories Inventories Deferred Tax Assets Net Current Deferred Tax Assets, Net, Current, Total Deferred taxes Other Assets Current Other current assets Assets Current Assets, Current, Total Fixed Income Investments, held to maturity Fixed income investments, held to maturity Fixed Income Investments, held to maturity Investments in Affiliated Companies Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total Investments in Affiliated Companies Fixed Assets less accumulated depreciation Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Fixed assets less accumulated depreciation Multiclient Seismic Data Balance at end of year Balance at beginning of year Capitalized costs directly incurred in acquiring and processing of seismic surveys that are licensed on a nonexclusive basis, net of amortization. Goodwill Ending Balance Beginning Balance Net Book Value Intangible Assets Intangible Assets, Net (Excluding Goodwill), Total Other Assets Noncurrent Other Assets Assets Assets Assets, Total LIABILITIES AND EQUITY LIABILITIES AND EQUITY Current Liabilities Current Liabilities Accounts Payable And Accrued Liabilities Current Accounts payable and accrued liabilities Accounts payable and accrued liabilities Estimated liability for taxes on income Estimated liability for taxes on income Dividend payable Dividend payable Long-term debt-current portion Commercial paper borrowings Long-term Debt, Current Maturities, Total Long-term debt - current portion Short-term borrowings Short-term Borrowings, Total Short-term borrowings Liabilities Current Liabilities, Current, Total Other Long-term Debt, Noncurrent Other Long-term Debt, Noncurrent, Total Long-term Debt Postretirement Benefits Postretirement Benefits Deferred Tax Liabilities Noncurrent Deferred Taxes Deferred Taxes Other Liabilities Noncurrent Other Liabilities Liabilities Liabilities, Total Liabilities, Total Equity Equity Common stock Common Stock, Value, Issued, Total Common stock Treasury Stock Value Treasury stock Retained Earnings Accumulated Deficit Retained earnings Accumulated other comprehensive loss Accumulated other comprehensive loss Stockholders Equity Schlumberger stockholders' equity Minority Interest Noncontrolling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Ending Balance Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total Liabilities And Stockholders Equity Liabilities and Stockholders' Equity, Total Receivables, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current, Ending Balance Allowance for Doubtful Accounts Receivable, Current, Beginning Balance Allowance for doubtful accounts on receivable CONSOLIDATED STATEMENT OF CASH FLOWS [Abstract] Cash flows from operating activities: Cash flows from operating activities: Adjustments to reconcile net income to cash provided by operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization, Total Depreciation and amortization Income Loss From Equity Method Investments Net Of Dividends Or Distributions Earnings of companies carried at equity, less dividends received Income (Loss) from Equity Method Investments, Net of Dividends or Distributions, Total Earnings of companies carried at equity, less dividends received Deferred income taxes Deferred income taxes Deferred income taxes Stock-based compensation expense Share-based Compensation, Total Stock-based compensation expense Pension and other postretirement benefits expense Pension and other postretirement benefits expense Increase (Decrease) in Pension and Postretirement Obligations, Total Pension and other postretirement benefits expense Pension And Other Postretirement Benefit Contributions Pension and other postretirement benefits funding Pension and other postretirement benefits funding Change in operating assets and liabilities: Change in assets and liabilities: Increase Decrease In Receivables (Increase) decrease in receivables Increase (Decrease) in Receivables, Total (Increase) decrease in receivables (Increase) decrease in inventories Increase Decrease In Inventories Increase (Decrease) in Inventories, Total Increase in inventories Increase Decrease Other Current Assets (Increase) decrease in other current assets Increase in other current assets Increase in other current assets The net change in the beginning and end of period Other Current Assets balances. Increase Decrease in accounts payable and accrued liabilities Decrease in accounts payable and accrued liabilities Decrease in estimated liability for taxes on income (Decrease) increase in estimated liability for taxes on income Increase Decrease In Other Operating Liabilities Decrease in other liabilities Increase Decrease In Other Operating Capital Net Other--net Other--net Other-net Net Cash Provided By Used In Operating Activities NET CASH PROVIDED BY OPERATING ACTIVITIES Cash flows from investing activities: Cash flows from investing activities: Payments To Acquire Property Plant And Equipment Capital expenditures Capital expenditures Payments to Acquire Property, Plant, and Equipment, Total Capital expenditures Payments For Proceeds From Capitalized Costs Support Equipment And Facilities Multiclient seismic data capitalized Multiclient seismic data capitalized The net cash outflow from capitalized costs directly incurred in acquiring and processing of seismic surveys that are licensed on a nonexclusive basis. Other Payments To Acquire Businesses Business acquisitions and investments, net of cash acquired Other business acquisitions and investments, net of cash acquired Sale of investments, net Payments For Proceeds From Investments Payments for (Proceeds from) Investments, Total Sale (purchase) of investments, net Payments For Proceeds From Other Investing Activities Other Other Other Net Cash Provided By Used In Investing Activities NET CASH USED IN INVESTING ACTIVITIES Cash flows from financing activities: Cash flows from financing activities: Payments Of Dividends Dividends paid Payments of Dividends, Total Dividends paid Proceeds from employee stock purchase plan Proceeds from employee stock purchase plan Proceeds from exercise of stock options Proceeds from exercise of stock options Payments For Repurchase Of Equity Stock repurchase program Payments for Repurchase of Equity, Total Stock repurchase program Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt, Total Proceeds from issuance of long-term debt Repayments Of Long Term Debt Repayment of long-term debt Repayments of Long-term Debt, Total Repayment of long-term debt Net decrease increase in short-term borrowings Net (decrease) increase in short-term borrowings Net Cash Provided By Used In Financing Activities NET CASH USED IN FINANCING ACTIVITIES Net increase (decrease) increase in cash before translation effect Cash And Cash Equivalents Period Increase Decrease Translation effect on cash Effect of Exchange Rate on Cash and Cash Equivalents, Total Translation effect on cash Cash And Cash Equivalents At Carrying Value Cash, end of period Cash, beginning of period Cash and Cash Equivalents, at Carrying Value, Total CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Stock Issued Treasury Stock [Member] Common Stock In Treasury Retained Earnings [Member] Retained Earnings Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Loss Noncontrolling Interests [Member] Noncontrolling Interests Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Comprehensive income: Currency translation adjustments Currency translation adjustments Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Currency translation adjustments Changes in fair value of derivatives Changes in fair value of derivatives Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax, Total Changes in fair value of derivatives Deferred employee benefits liabilities Other Comprehensive Income, Defined Benefit Plans Adjustment, Net of Tax, Total Deferred employee benefits liabilities Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Total comprehensive income Stock Issued During Period Value Stock Options Exercised Shares sold to optionees, less shares exchanged Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Vesting of restricted stock Stock Issued During Period Value Employee Stock Purchase Plan Shares issued under employee stock purchase plan Treasury Stock Value Acquired, Cost Method Stock repurchase program Stock Issued During Period, Value, Share-based Compensation Stock-based compensation cost Stock Issued During Period, Value, Conversion of Convertible Securities Shares issued on conversion of debentures Stockholders' Equity, Other Other Dividends, Cash Dividends declared (2011 - $0.25; 2010 - $0.21) Shares Outstanding Ending Balance, in shares Beginning Balance, in shares Number of shares of stock held by shareholders. Stock Issued During Period, Shares, Stock Options Exercised Shares sold to optionees, less shares exchanged, in shares Stock Issued During Period, Shares, Employee Stock Purchase Plans Shares issued under employee stock purchase plan, in shares Treasury Stock, Shares, Acquired Stock repurchase program, in shares Dividends declared, per share Dividends declared, per share Charges Restructuring and Related Activities Disclosure [Text Block] Asset Purchase Disclosure [Text Block] Acquisitions Net assets purchased during the period, excluding net assets acquired in business combinations. Inventory Disclosure [Text Block] Inventory Property, Plant and Equipment Disclosure [Text Block] Fixed Assets Multiclient Seismic Data [Text Block] Multiclient Seismic Data Disclosure of the carrying amount of multiclient seismic data based on completed and in-process seismic surveys. Goodwill Disclosure [Text Block] Goodwill This block of text may be used to disclose all or part of the information related to goodwill. Intangible Assets Disclosure [Text Block] Intangible Assets Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Debt Disclosure [Text Block] Long-term Debt Income Tax Disclosure [Text Block] Income Tax Contingencies Disclosure [Text Block] Contingencies Describes any existing condition, situation, or set of circumstances involving uncertainty as of the balance sheet date (or prior to issuance of the financial statements) as to a probable or reasonably possible gain or loss incurred by an entity and typically discloses the amount of range of possible gain or loss recorded. Segment Reporting Disclosure [Text Block] Segment Information Pension and Other Postretirement Benefits Disclosure [Text Block] Pension and Other Postretirement Benefits Reconciliation of Earnings Per Share [Text Block] Reconciliation of Earnings Per Share Reconciliation of earnings per share. Inventory Disclosure Table [Text Block] Inventory Disclosure Table Inventory Disclosure Table. Property, Plant and Equipment [Text Block] Property, Plant and Equipment Multiclient Seismic Data Table [Text Block] Multiclient Seismic Data Table Disclosure of the carrying amount of multiclient seismic data based on completed and in-process seismic surveys. Schedule of Goodwill [Text Block] Schedule of Goodwill Schedule Of Intangible Assets By Major Class [Text Block] Schedule of Intangible Assets by Major Class Schedule of Intangible Assets by Major Class Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance Schedule of Derivative Instruments, Effect on Income and Other Comprehensive Income [Text Block] Schedule of Derivative Instruments, Effect on Income and Other Comprehensive Income Schedule of Derivative Instruments, Effect on Income and Other Comprehensive Income Long-term Debt [Text Block] Long-term Debt Income Tax Disclosure Table [Text Block] Income Tax Disclosure Table Income Tax Disclosure Table. Components Of Net Deferred Tax Assets [Text Block] Components of Net Deferred Tax Assets Components of net deferred tax assets Components Of Consolidated Income Taxes [Text Block] Components of Consolidated Income Taxes Components of Consolidated Income Taxes Reconciliation Of United States Statutory Federal Tax Rate [Text Block] Reconciliation of the US Statutory Federal Tax Rate Reconciliation of the US Statutory Federal Tax Rate Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Text Block] Pension Disclosure [Text Block] Net Pension Cost for the Schlumberger Pension Plans Pension Disclosure Segment Reporting Information, by Segment [Axis] Reporting Segment [Domain] Debt Instrument [Axis] Debt Instrument, Name [Domain] Restructuring and Related Cost, by Type of Restructuring [Axis] Type of Restructuring [Domain] Medicare Part D Subsidy [Member] Medicare Part D Subsidy [Member] Medicare Part D Subsidy [Member] Charges, pretax Charges, pretax Recorded pretax charges Charges, pretax Amount charged against earnings in the period relating to items of an unusual nature, pretax. Charges Charges, net of tax Amount charged against earnings in the period relating to items of an unusual nature. Guaranteed notes face amount Notes relating to interest rate swap Euro medium term note program Guaranteed Notes 5 Point 25 Percent Due 2013 Member 5.25% Guaranteed Notes due 2013 [Member] 5.25% Guaranteed Notes due 2013 [Member] Guaranteed Notes 3 Point 00 Percent Due 2013 Member 3.00% Guaranteed Notes due 2013 [Member] 3.00% Guaranteed Notes due 2013 [Member] Commercial Paper [Member] Debt, Other [Member] Debt, Other Charges, tax Charges, tax Amount charged against earnings in the period relating to items of an unusual nature, tax. Component of Other Operating Cost and Expense, General [Axis] Component of Other Operating Cost and Expense, Name [Domain] Schlumberger amounts attributable to: Dilutive Securities Dilutive Securities, Total Assumed conversion of debentures Net Income (Loss) Available to Common Stockholders, Diluted Diluted Incremental Common Shares Attributable to Conversion of Debt Securities Incremental Common Shares Attributable to Conversion of Debt Securities, Total Assumed conversion of debentures Incremental Common Shares Attributable to Call Options and Warrants Assumed exercise of stock options Incremental Common Shares Attributable to Nonvested Shares with Forfeitable Dividends Unvested restricted stock Earnings Per Share Abstract Earnings per Share Payments to Acquire Businesses and Interest in Affiliates Acquisitions and minority interest investments, net of cash acquired Senior Notes 8625 Due 2014 Member 8.625% Senior Notes due 2014 [Member] 8.625% Senior Notes due 2014 [Member] Senior Notes 600 Due 2016 Member 6.00% Senior Notes due 2016 [Member] 6.00% Senior Notes due 2016 [Member] Senior Notes 975 Due 2019 Member 9.75% Senior Notes due 2019 [Member] 9.75% Senior Notes due 2019 [Member] Tradename [Member] Customer Relationships [Member] Weighted average amortization period for all intangible assets (years) Finite-Lived Intangible Assets, Weighted-Average Useful Life, Total weighted-average life in years Summary Of Inventory [Abstract] Inventory Summary of Inventory [Abstract] Raw materials & field materials Inventory, Raw Materials and Supplies, Total Raw materials & field materials Work in process Work in process Finished goods Finished goods Summary Of Fixed Assets Abstract Property, Plant and Equipment Summary of Fixed Assets [Abstract] Property, plant & equipment Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Less: Accumulated depreciation Less: Accumulated depreciation Less: Accumulated depreciation Depreciation expense relating to fixed assets Depreciation, Total Change In The Carrying Amount Of Multiclient Seismic Data [Abstract] Multiclient Seismic Data Change in the Carrying Amount of Multiclient Seismic Data [Abstract] Multiclient Seismic Data Capitalized In Period Capitalized in period Multiclient Seismic Data, Capitalized in period Multiclient Seismic Data Charged To Cost Of Goods Sold And Services Charged to expense Multiclient Seismic Data, Charged to cost of goods sold and services Changes In The Carrying Amount Of Goodwill By Business Segment [Abstract] Schedule of Goodwill Changes in the Carrying Amount of Goodwill by Business Segment [Abstract] Goodwill by Segment [Axis] Goodwill, Segment [Domain] Oilfield Services [Member] Oilfield Services Oilfield Services [Member] Impact of change in exchange rates Impact of change in exchange rates Gross Book Value And Accumulated Amortization Of Intangible Assets Abstract Gross book value and accumulated amortization of intangible assets Gross Book Value and Accumulated Amortization of Intangible Assets [Abstract] Intangible Assets by Major Class [Axis] Intangible Assets by Major Class [Axis] Intangible Assets, Major Class Name [Domain] Intangible Assets, Major Class Name [Domain] Technology/Technical Know-How [Member] Other Intangible Assets [Member] Other [Member] Other Intangible Assets [Member] Intangible Assets Gross Excluding Goodwill Gross Book Value Intangible Assets, Gross (Excluding Goodwill) Accumulated Amortization Estimated amortization charged to income, 2011 Estimated amortization charged to income, 2012 Estimated amortization charged to income, 2012 Estimated amortization charged to income, 2013 Estimated amortization charged to income, 2013 Estimated amortization charged to income, 2014 Estimated amortization charged to income, 2014 Estimated amortization charged to income, 2015 Estimated amortization charged to income, 2015 Estimated amortization charged to income, 2016 Derivatives, by Derivative Instrument Contract [Axis] Derivatives, by Derivative Instrument Contract [Axis] Derivatives, by Derivative Instrument Contract [Domain] Derivatives, by Derivative Instrument Contract [Domain] Fixed Rate Debt [Member] Fixed Rate Debt [Member] Floating Rate Debt [Member] Floating Rate Debt [Member] Recognized a cumulative net gain in Equity relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges Recognized a cumulative net gain in Equity relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges Contracts outstanding in various foreign currencies (US dollar equivalent) Contracts outstanding in various foreign currencies (US dollar equivalent) Fixed Rate Debt Fixed rate debt aggregate, after taking into account the effects of the interest rate swaps Fixed rate debt Variable Rate Debt Variable rate debt aggregate, after taking into account the effects of the interest rate swaps Variable rate debt Short-term investments and Fixed income investments, held to maturity Marketable Securities, Current, Total Short-term investments and Fixed income investments, held to maturity Notional amount of interest rate swap Notional amount of interest rate swap Derivative swap interest rate Derivative swap interest rate Fair Values Of Outstanding Derivative Instruments Abstract Fair values of outstanding derivative instruments Fair Values of Outstanding Derivative Instruments [Abstract] Derivatives, Fair Value, by Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Foreign Exchange Contract [Member] Interest Rate Contract [Member] Commodity Contract [Member] Derivatives, Fair Value, by Balance Sheet Location [Axis] Balance Sheet Location [Domain] Other Current Assets [Member] Other Current Assets [Member] Other Assets [Member] Accounts Payable and Accrued Liabilities [Member] Accounts Payable and Accrued Liabilities [Member] Other Liabilities [Member] Derivative assets Derivative Assets Designated As Hedging Instruments [Abstract] Derivative designated as hedges: Derivative Assets Designated as Hedging Instruments [Abstract] Fair value of derivatives assets designated as hedges Fair value of derivatives assets designated as hedges Derivative Assets Not Designated As Hedging Instruments [Abstract] Derivative not designated as hedges: Derivative Assets Not Designated as Hedging Instruments [Abstract] Fair value of derivatives assets not designated as hedges Fair value of derivatives assets not designated as hedges Derivative Fair Value Of Derivative Asset Derivative Asset, Fair Value, Total Derivative Liabilities Derivative Liabilities Designated As Hedging Instruments [Abstract] Derivative designated as hedges: Derivative Liabilities Designated as Hedging Instruments [Abstract] Fair value of derivatives liabilities designated as hedges Fair value of derivatives liabilities designated as hedges Derivative Liabilities Not Designated As Hedging Instruments [Abstract] Derivative not designated as hedges: Derivative Liabilities Not Designated as Hedging Instruments [Abstract] Fair value of derivatives liabilities not designated as hedges Fair value of derivatives liabilities not designated as hedges Derivative Liability, Fair Value Derivative Liability, Fair Value, Total Effect Of Derivative Instruments Designated As Fair Value Hedges And Not Designated As Hedges On The Consolidated Statement Of Income [Abstract] Effect of derivative instruments designated as fair value hedges and not designated as hedges on the consolidated statement of income Effect of Derivative Instruments Designated as Fair Value Hedges and Not Designated as Hedges on the Consolidated Statement of Income [Abstract] Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Hedging Relationship [Domain] Fair Value Hedging [Member] Nondesignated [Member] Derivative Instruments, Gain (Loss) by Derivative Instrument Risk [Axis] Derivative Instruments, Gain (Loss) by Income Statement Location [Axis] Income Statement and Other Comprehensive Income Location [Domain] Cost of Sales [Member] Interest Expense [Member] Interest expense Gain/(loss) recognized in income Gain/(loss) recognized in income Effect Of Derivative Instruments In Cash Flow Hedging Relationships On Income And Other Comprehensive Income Abstract Effect of derivative instruments in cash flow hedging relationships on income and other comprehensive income (OCI) Effect of Derivative Instruments in Cash Flow Hedging Relationships on Income and Other Comprehensive Income [Abstract] Research and Development Expense [Member] Research and Development Expense [Member] Gain (loss) reclassified from accumulated OCI into income Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total Gain (loss) reclassified from accumulated OCI into income Gain (loss) recognized in OCI Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total Gain (loss) recognized in OCI Summary of Other Long-Term Debt [Abstract] Summary of Other Long-Term Debt Summary of Other Long-Term Debt [Abstract] Long-term debt, carrying amount Long-term debt, carrying amount Fair Value Adjustment Hedging Carrying Amount Fair value adjustment-hedging Fair value adjustment, hedging, carrying amount Long-term debt, fair value Income From Continuing Operations Before Taxes Which Were Subject To U S And Non U S Income Taxes Abstract Income from Continuing Operations Before Taxes Which Were Subject to US and Non-US Income Taxes Income from Continuing Operations Before Taxes Which Were Subject to US and Non-US Income Taxes [Abstract] Income (Loss) from Continuing Operations before Income Taxes, United States United States The portion of earnings (loss) from continuing operations before income taxes that is attributable to United States operations. Income (Loss) from Continuing Operations before Income Taxes, Non United States Outside United States The portion of earnings (loss) from continuing operations before income taxes that is attributable to foreign operations, which is defined as income (loss) generated from operations located outside the United States. Income (Loss) from Continuing Operations before Income Taxes and Minority Interest Income (Loss) from Continuing Operations before Income Taxes and Minority Interest, Total Income (Loss) from Continuing Operations before Income Taxes and Minority Interest Region Reporting Information, by Region [Axis] Disclosure of profit or loss, total assets for each reportable region, and a description of the types of products and services for each reportable region. Reporting Region [Domain] A regional component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Outside United States [Member] Outside United States [Member] United States [Member] United States [Member] Net Pretax Credit Net Pretax Credit Net Pretax Credit Deferred tax assets, valuation allowances relating to net operating losses in certain countries Deferred Tax Assets, Operating Loss Carryforwards, Total Effective Income Tax Rate Reconciliation At U S Federal Statutory Income Tax Rate US statutory federal tax rate US statutory federal rate The United States federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems. Components of Net Deferred Tax Assets [Abstract] Components of Net Deferred Tax Assets Components of Net Deferred Tax Assets [Abstract] Postretirement benefits, net Deferred Tax Assets, Intangible Assets Intangible assets Deferred Tax Assets, Intangible Assets Other, net Deferred Tax Assets, Net Deferred Tax Assets, Net, Total Components of Consolidated Taxes on Income [Abstract] Components of Consolidated Taxes on Income Components of Consolidated Taxes on Income [Abstract] Current: Current Federal Tax Expense (Benefit) United States - Federal Current State and Local Tax Expense (Benefit) United States - State Current Foreign Tax Expense (Benefit) Outside United States Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit), Total Deferred: Deferred Federal Income Tax Expense (Benefit) United States - Federal Deferred State and Local Income Tax Expense (Benefit) United States - State Deferred Foreign Income Tax Expense (Benefit) Outside United States Valuation allowance Valuation allowance Total Of Components Of Deferred Income Taxes Deferred income taxes Total Of Components Of Deferred Income Taxes Disclosure Reconciliation Of The U S Statutory Federal Tax Rate To The Consolidated Effective Income Tax Rate Abstract Reconciliation of the US statutory federal tax rate to the consolidated effective income tax rate Reconciliation of the US Statutory Federal Tax Rate to the Consolidated Effective Income Tax Rate [Abstract] Non-US income taxed at different rates Effective Income Tax Rate Reconciliation, Nondeductible Expense Effective Income Tax Rate Reconciliation, Nondeductible Expense, Total Charges Effective Income Tax Rate Reconciliation Other Adjustments Other Effective income tax rate Effective income tax rate Distribution [Member] Distribution Distribution [Member] Corporate and Other Member Corporate and other Corporate and Other [Member] Interest Income [Member] Interest income Charges and Credits [Member] Charges Charges And Credits [Member] Segment Reporting Information, Revenue Segment Reporting Information, Revenue, Total Revenue Income before taxes Segment Reporting Information, Income (Loss) before Income Taxes, Total Interest income included in the segment results Interest expense included in the segment results Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis] Defined Benefit Plans [Domain] United States Pension Plans of US Entity Defined Benefit Foreign Pension Plans, Defined Benefit Service cost-benefits earned during period Service cost Interest cost on accumulated postretirement benefit obligation Interest cost on projected benefit obligation Interest cost Expected return on plan assets Expected return on plan assets Amortization of net loss Amortization of net loss Amortization of prior service cost Amortization of prior service cost Amortization of prior service cost Defined Benefit Plan, Net Periodic Benefit Cost before Curtailments Total pension cost Total periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost before Curtailments Contributions to defined benefit pension plans Contributions to defined benefit pension plans Document and Entity Information [Abstract] Document and Entity Information. Fixed Assets (Details) [Abstract] Fixed Assets Details. Inventory (Details) [Abstract] Inventory Details. Multiclient Seismic Data (Details) [Abstract] Multiclient Seismic Data Details Abstract. Goodwill (Details) [Abstract] Goodwill Details Abstract. Schedule of Goodwill [Table] Goodwill [Line Items] Acquisitions (Details) [Abstract] Acquisitions Details Abstract. Intangible Assets (Details) [Abstract] Intangible Assets. Schedule of Intangible Assets by Major Class [Table] Schedule Of Intangible Assets By Major Class Table. Intangible Assets [Line Items] Intangible Assets Line Items. Derivative Instruments and Hedging Activities (Details) [Abstract] Derivative Instruments And Hedging Activities. Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivatives, Fair Value [Line Items] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Line Items] Derivative [Table] Derivative [Line Items] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Segment Information (Tables) [Abstract] Segment Information Tables Abstract. Segment Information Textuals Abstract Segment Information Textuals Abstract. Segment Information (Textuals) Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Earnings Per Share Reconciliation [Abstract] Reconciliation of Earnings Per Share Postretirement Medical Plan Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan Disclosure [Line Items] Intangible Assets Additional Information Abstract Intangible Assets - Additional Information Intangible Assets - Additional Information [Abstract]. Number Of Countries In Which Company Conducts Business Number of countries in which Schlumberger conducts business Number of countries in which schlumberger conducts business. Derivative Instruments and Hedging Activities (Textuals) [Abstract] Derivative Instruments And Hedging Activities Textuals [Abstract]. Long-term Debt (Textuals) [Abstract] Long-term Debt Textuals [Abstract]. Acquisitions Textuals Abstract Acquisitions Textuals Abstract. Acquisitions (Textuals) [Abstract] Income Taxes [Table] Income Taxes. Income Taxes [Line Items] Income Taxes Line Items. Segment Information (Details) [Abstract] Segment Information. Other Postretirement Benefits Disclosure [Text Block] Net Periodic Benefit Cost for the Schlumberger US Postretirement Medical Plan Other Postretirement Benefits Disclosure. Inventory (Tables) [Abstract] Inventory. Fixed Assets (Tables) [Abstract] Fixed Assets. Multiclient Seismic Data (Tables) [Abstract] Multiclient Seismic Data. Goodwill (Tables) [Abstract] Goodwill. Intangible Assets (Tables) [Abstract] Intangible Assets. Derivative Instruments and Hedging Activities (Tables) [Abstract] Derivative Instruments and Hedging Activities. Acquisitions [Abstract] Acquisitions. Inventory [Abstract] Fixed Assets [Abstract] Multiclient Seismic Data [Abstract] Multiclient Seismic Data. Goodwill [Abstract] Goodwill. Intangible Assets [Abstract] Derivative Instruments and Hedging Activities [Abstract] Income Tax [Abstract] Contingencies [Abstract] Contingencies. Segment Information [Abstract] Segment Information. Disclosure Net Pension Cost For Parent Company Pension Plans Abstract Net Pension Cost for the Schlumberger Pension Plans Disclosure Net Pension Cost For The Parent Company Pension Plans. Disclosure Net Periodic Benefit Cost For The Parent Company Us Postretirement Medical Plan Abstract Net Periodic Benefit Cost for the Schlumberger US Postretirement Medical Plan Disclosure Net Periodic Benefit Cost For The Parent Company Us Postretirement Medical Plan. Income (Loss) from Continuing Operations Attributable to Parent Basic Income from Continuing Operations Income (Loss) from Continuing Operations, Per Basic Share Basic Income from Continuing Operations Income (Loss) from Continuing Operations, Per Diluted Share Diluted Income from Continuing Operations Basis of Presentation [Abstract] Merger Related Transaction Costs [Member] Merger Related Transaction Costs [Member] Merger related transaction costs. Guaranteed Notes 4 Point 50 Percent Due 2014 Member 4.50% Guaranteed Notes due 2014 [Member] Guaranteed Notes 4 Point 50 Percent Due 2014. Guaranteed Notes 2 Point 75 Percent Due 2015 Member 2.75% Guaranteed Notes due 2015 [Member] Guaranteed Notes 2 Point 75 Percent Due 2015. Merger & integration Merger & integration Finite-Lived Intangible Assets, Amortization Expense Amortization expense on intangible assets excluding goodwill Price Risk Derivative Instruments Not Designated as Hedging Instruments, at Fair Value, Net Price Risk Derivative Instruments Not Designated as Hedging Instruments, at Fair Value, Net, Total Commodity forward contract outstanding Income Taxes Textuals Abstract Income Taxes (Textuals) [Abstract] Income Taxes. Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount First Quarter Employee stock options to purchase Deferred Tax Assets, Investment in Subsidiaries Investments in non-US Subsidiaries Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Basis of Presentation Earnings Per Share [Abstract] Earnings Per Share Disclosure. Earnings Per Share [Text Block] Earnings Per Share Long-term Debt Disclosure [Abstract] Long Term Debt Disclosure. Pension and Other Postretirement Benefits [Abstract] Pension and Other Postretirement Benefits. Earnings Per Share (Details) [Abstract] Earnings Per Share. Earnings Per Share (Tables) [Abstract] Earnings Per Share. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Text Block] Fixed Assets Textuals Abstract Fixed Assets. Fixed Assets (Textuals) [Abstract] Future Amortization Expense Remainder Of Year Future Amortization expense charged to income, remainder of 2011 Estimated amortization charged to income, remainder of 2011 The amount of amortization expense expected to be recognized during the remainder of the year. Reservoir Characterization Member Reservoir Characterization. Reservoir Characterization Reservoir Production Member Reservoir Production. Reservoir Production Drilling Member Drilling. Drilling Pension and Other Postretirement Benefits (Table) [Abstract] Pension and Other Postretirement Benefits (Table) [Abstract] Pension and Other Postretirement Benefits. Pension and Other Postretirement Benefits (Details) [Abstract] Pension and Other Postretirement Benefits. Pension and Other Postretirement Benefits (Details) [Abstract] Goodwill, Allocation Adjustment Adjustments relating to Smith acquisition Income Tax (Tables) [Abstract] Income Tax. Income Tax (Details) [Abstract] Income Tax. Long-term Debt (Tables) [Abstract] Long-term Debt. Long-term Debt (Details) [Abstract] Long-term Debt. Segment Results [Member] Segment Results Segment Results. Other Services [Member] Eliminations and other Other Services. Revenues [Abstract] Revenue Cost of Revenue Cost of Goods and Services Sold [Abstract] Business Acquisition Cost Of Acquired Entity Shares Distributed Equivalent new Schlumberger shares of common stock issued Business Acquisition Cost Of Acquired Entity Shares Distributed. Geoservices Member Geoservices. Geoservices [Member] Business Acquisition, Cost of Acquired Entity, Purchase Price Business Acquisition, Cost of Acquired Entity, Purchase Price, Total Purchase price Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition [Line Items] Smith International Incorporate Member Smith International Incorporate. Smith International Incorporate [Member] Effective Income Tax Rate Reconciliation, State and Local Income Taxes US state income taxes Eliminations [Member] Eliminations Eliminations. Guaranteed Notes 4 Point 20 Percent Due 2021 Member 4.20% Guaranteed Notes due 2021 [Member] Guaranteed Notes 4 Point 20 Percent Due 2021 . Guaranteed Notes 2 Point 65 Percent Due 2016 Member 2.65% Guaranteed Notes due 2016 [Member] Guaranteed Notes 2 Point 65 Percent Due 2021. Revenue, Oil and Gas Services Oilfield Services Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period Revenue reported by Smith Subsequent Event (Details) [Abstract] Subsequent Event. Proceeds From Divestiture Of Business Divestiture of Global Connectivity Services business Proceeds From Divestiture Of Business. Subsequent Event Textuals Abstract Subsequent Event. Subsequent Event (Textuals) [Abstract] Long Term Debt Additional Textuals Abstract Long-term Debt Additional (Textuals) [Abstract] Long Term Debt Additional Textuals. Repurchased outstanding Senior Notes due Repurchase of senior notes Repurchased outstanding Senior Notes due. Debt Instrument, Interest Rate, Stated Percentage Debt instrument interest rate Repayments Of Senior Debt With Senior Notes [Member] Repayments Of Senior Debt With Senior Notes Member. Debt Instrument, Interest Rate, Effective Percentage Effective interest rate on euro denominated debt Charges [Abstract] Charges. Charges (Tables) [Abstract] Charges. Subsequent Event [Abstract] Subsequent event. Subsequent Events Text Block Subsequent Event The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. Charges (Details) [Abstract] Charges. Summary Of Charges Text Block Summary of Charges Summary of Charges. Summary of Charges [Table] Summary of charges. Summary of Charges [Line Items] Summary of charges. Summary Of Charges Abstract Summary of Charges Summary of charges. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Outstanding Stock Awards [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common Stock, Value, Outstanding Common stock equity consideration Cost of Goods and Services Sold Cost of revenue