Accounts Payable And Accrued Liabilities Current Accounts payable and accrued liabilities Accounts payable and accrued liabilities Accounts payable and accrued liabilities. Accounts Payable And Accrued Liabilities [Member] Accounts payable and accrued liabilities [Member] Accounts payable and accrued liabilities, other. Accounts Payable And Accrued Liabilities Other Other Accounts Payable Trade Current Trade Accrued Income Taxes Current Estimated liability for taxes on income Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Less accumulated depreciation Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Loss [Member] Acquisitions And Discontinued Operations [Line Items] Acquisitions And Discontinued Operations [Line Items] Acquisitions And Discontinued Operations [Line Items] Acquisitions And Discontinued Operations [Table] Acquisitions And Discontinued Operations [Table] Acquisitions And Discontinued Operations [Table] Actuarial Changes In Benefit Obligation Net Gain Or Loss Actuarial Changes In Benefit Obligation Net Gain Or Loss Actuarial losses Actuarial loss. Actuarial Loss [Abstract] Actuarial loss Additional Financial Information Disclosure [Text Block] Supplementary Information The aggregate intrinsic value of stock options exercisable. Aggregate Intrinsic Value Of Stock Options Exercisable Aggregate intrinsic value of stock options exercisable All other assets. All Other Assets [Member] All other assets [Member] Allowance for doubtful accounts amounts written off. Allowance For Doubtful Accounts Amounts Written Off Amounts written off Allowance For Doubtful Accounts Receivable Current Balance at end of year Balance at beginning of year Allowance for doubtful accounts on receivable Allowance for doubtful accounts. Allowance For Doubtful Accounts Table [Text Block] Allowance for Doubtful Accounts Alternative Investments [Member] Alternative Investments [Member] Alternative investments [Member] Amendment Flag Amendment Flag Amortization Of Intangible Assets Amortization expense on intangible assets excluding goodwill Asset. Asset Assets Asset Impairment Charges Asset Impairment Charges Asset Impairments [Member] Asset Impairments [Member] Impairment relating to WesternGeco's first generation Q-Land acquisition system [Member] Assets Total Assets Assets [Abstract] ASSETS Assets Current Current assets total Assets Current [Abstract] Current Assets Assumed in Merger transaction. Assumed In Merger Transaction Assumed in Smith transaction, shares Assumed in merger transaction weighted average exercise price. Assumed In Merger Transaction Weighted Average Exercise Price Assumed in Smith transaction, Weighted-average exercise price Award Type [Axis] Award Type [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Brazil [Member] Brazil [Member] Brazil [Member] Building And Building Improvements [Member] Buildings & improvements [Member] Buildings And Improvements Gross Buildings & improvements Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition Cost Of Acquired Entity Equity Interests Issued And Issuable Total fair value of the consideration transferred Business Acquisition Cost Of Acquired Entity Purchase Price Purchase price Business acquisition cost of acquired entity share distributed. Business Acquisition Cost Of Acquired Entity Share Distributed Equivalent Schlumberger shares of common stock issued Business acquisition cost of acquired entity stock per share. Business Acquisition Cost Of Acquired Entity Stock Per Share Under merger agreement, shares of Schlumberger in exchange for each Smith share Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition [Table] Business Acquisition [Table] Business Acquisition [Table] Business Combination Disclosure [Text Block] Acquisitions Canada [Member] Canada [Member] Canada [Member] Cash Cash Cash Acquired From Acquisition Cash acquired in acquisition of Smith International, Inc. Cash And Cash Equivalents At Carrying Value Cash, end of year Cash, beginning of year Cash And Cash Equivalents [Member] Cash and cash equivalents [Member] Cash And Cash Equivalents Period Increase Decrease Net increase (decrease) in cash before translation effect Cash paid for interest and income taxes. Cash Paid For Interest And Income Taxes Table [Text Block] Cash Paid for Interest and Income Taxes Cash Provided By Used In Investing Activities Discontinued Operations Cash flow from discontinued operations - investing activities Global Connectivity Services business discontinued operations Cash Provided By Used In Operating Activities Discontinued Operations Cash flow from discontinued operations - operating activities CE Franklin limited. Ce Franklin Limited [Member] CE Franklin Ltd. [Member] The changes in the accumulated postretirement benefit obligation, plan assets and funded status. Changes In Accumulated Postretirement Benefit Obligation Plan Assets And Funded Status Table [Text Block] Changes in Accumulated Postretirement Benefit Obligation, Plan Assets and Funded Status Changes in the carrying amount of goodwill. Changes In Carrying Amount Of Goodwill Table [Text Block] Changes in Carrying Amount of Goodwill Changes in projected benefit obligation plan assets and funded status of plans. Changes In Projected Benefit Obligation Plan Assets And Funded Status Of Plans Table [Text Block] Changes in Projected Benefit Obligation, Plan Assets and Funded Status of Plans Charges. Charges Charges, Net Charges, net Charges and credits. Charges And Credits [Member] Charges & credits [Member] Restructuring charges tax. Charges Tax Charges, Tax Commercial Paper [Member] Commercial paper [Member] Commercial Paper Programs Maturing December Two Zero One Three [Member] Commercial Paper Programs Maturing December Two Zero One Three [Member] Commercial paper programs mature in December 2013 [Member] Commercial Paper programs maturing July two zero one six. Commercial Paper Programs Maturing July Two Zero One Six [Member] Commercial paper programs mature in July 2016 [Member] Commitments And Contingencies Disclosure [Text Block] Contingencies Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments Disclosure [Text Block] Leases and Lease Commitments Commitments [Line Items] Commitments [Line Items] Commitments [Line Items] Commitments [Table] Commitments [Table] Commitments [Table] Commodity Contract [Member] Commodity contracts [Member] Common Stock Dividends Per Share Declared Dividends declared, per share Common Stock [Member] Common Stock Issued [Member] Common Stock Par Or Stated Value Per Share Common stock, par value Common Stock Shares Authorized Common stock, shares authorized Common Stock Shares Outstanding Common stock, shares outstanding Number of shares of Smith common stock outstanding as of the acquisition date Common Stock Value Common stock Common Stock Value Outstanding Common stock equity consideration Component Of Other Operating Cost And Expense General [Axis] Component of Other Operating Cost and Expense [Axis] Component Of Other Operating Cost And Expense Name [Domain] Component of Other Operating Cost and Expense, Name [Domain] Components of deferred income taxes. Components Of Deferred Income Taxes Deferred income taxes Components Of Deferred Tax Assets And Liabilities [Line Items] Components Of Deferred Tax Assets And Liabilities [Line Items] Components Of Deferred Tax Assets And Liabilities [Line Items] Components Of Deferred Tax Assets And Liabilities [Table] Components Of Deferred Tax Assets And Liabilities [Table] Components Of Deferred Tax Assets And Liabilities [Table] Comprehensive Income Net Of Tax Comprehensive income attributable to Schlumberger Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Comprehensive income Concentration of credit risk. Concentration Of Credit Risk Policy [Text Block] Concentration of Credit Risk Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Sale Of Interest By Parent Sale of CE Franklin Consolidation Policy [Text Block] Principles of Consolidation Corporate And Other [Member] Corporate [Member] Corporate Debt Securities [Member] Corporate bonds [Member] Cost Of Goods And Services Sold Cost of revenue Cost Of Revenue [Member] Costofrevenue [Member] Cost of revenue [Member] Cost Of Sales [Member] Cost of revenue [Member] Costs And Expenses [Abstract] Expenses Currency translation adjustments. Currency Translation Adjustments [Member] Currency translation adjustments [Member] Current Federal Tax Expense Benefit United States - Federal Current Fiscal Year End Date Current Fiscal Year End Date Current Foreign Tax Expense Benefit Outside United States Current Income Tax Expense Benefit Current Income Tax Expense (Benefit), Total Current Income Tax Expense Benefit Continuing Operations [Abstract] Current: Current State And Local Tax Expense Benefit United States - State Customer Relationships [Member] Customer Relationships [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument Basis Spread On Variable Rate Basis points Debt Instrument Carrying Amount Debt instrument maturity date Long-term debt, carrying amount Debt Instrument Face Amount Guaranteed notes face amount Notes relating to interest rate swap Debt Instrument Fair Value Long-term debt, fair value Debt Instrument Interest Rate Effective Percentage Effective interest rate on euro denominated debt Debt Instrument Interest Rate Stated Percentage Interest rate Debt instrument interest rate Debt instrument, interest rate Debt Instrument Maturity Debt Instrument Maturity Debt instrument interest rate Debt Instrument Name [Domain] Debt Instrument, Name [Domain] Debt Instrument [Table] Schedule of Long-term Debt Instruments [Table] Debt [Member] Debt [Member] Debt, other. Debt Other [Member] Other variable rate debt [Member] Debt Securities [Member] Debt securities [Member] Deferred Compensation Arrangement With Individual Compensation Expense Expenses for deferred benefit programs Deferred employee benefits liabilities. Deferred Employee Benefits Liabilities [Member] Pension and other postretirement benefit plans [Member] Deferred Federal Income Tax Expense Benefit United States - Federal Deferred Foreign Income Tax Expense Benefit Outside United States Deferred Income Tax Expense Benefit Deferred income taxes Deferred Income Tax Expense Benefit Continuing Operations [Abstract] Deferred: Deferred State And Local Income Tax Expense Benefit United States - State Deferred tax assets, intangible assets. Deferred Tax Assets Intangible Assets Intangible assets Deferred Tax Assets Investment In Subsidiaries Investments in non-US subsidiaries Deferred Tax Assets Net Net deferred tax assets Deferred Tax Assets Net Current Deferred taxes Deferred Tax Assets Operating Loss Carryforwards Domestic Deferred tax assets, valuation allowances relating to net operating losses in certain countries Deferred Tax Assets Other Other, net Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits Postretirement benefits Deferred Tax Liabilities Noncurrent Deferred Taxes Defined Benefit Plan Accumulated Benefit Obligation Accumulated benefit obligation Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax Total amount recognized in accumulated other comprehensive income Total amount recognized in accumulated other comprehensive income Defined Benefit Plan Accumulated Other Comprehensive Income Before Tax [Abstract] Amounts Recognized in Accumulated Other Comprehensive Loss Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax Actuarial losses Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax Prior service cost Defined Benefit Plan Actual Return On Plan Assets Actual return on plan assets Defined Benefit Plan Actuarial Gain Loss Actuarial losses Defined Benefit Plan Amortization Of Gains Losses Amortization of net loss Defined Benefit Plan Amortization Of Net Gains Losses Net actuarial losses Defined Benefit Plan Amortization Of Net Prior Service Cost Credit Prior service cost (credit) Defined Benefit Plan Amortization Of Prior Service Cost Credit Amortization of prior service cost Defined Benefit Plan Amounts Recognized In Balance Sheet [Abstract] Amounts Recognized in Balance Sheet Defined Benefit Plan Assets For Plan Benefits Current And Noncurrent Total of post retirement benefits Defined Benefit Plan Assets For Plan Benefits Noncurrent Other Assets Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Compensation Increase Compensation increases Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate Discount rate Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets Return on plan assets Defined Benefit Plan Benefit Obligation Benefit obligation at end of year Benefit obligation at beginning of year Defined Benefit Plan Benefits Paid Benefits paid Defined Benefit Plan By Plan Asset Categories [Axis] Defined Benefit Plan, Asset Categories [Axis] Defined Benefit Plan Change In Benefit Obligation [Roll Forward] Change in Accumulated Postretirement Benefit Obligation Change in Projected Benefit Obligations Defined Benefit Plan Change In Fair Value Of Plan Assets [Roll Forward] Change in Plan Assets Defined Benefit Plan Contributions By Employer Company contributions Defined Benefit Plan Contributions By Plan Participants Contributions by plan participants Contributions by plan participants Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation 1 Effect on accumulated postretirement benefit obligation, One percentage point decrease Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components 1 Effect on total service and interest cost components, One percentage point decrease Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation Effect on accumulated postretirement benefit obligation, One percentage point increase Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components Effect on total service and interest cost components, One percentage point increase Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Anticipated contributions to postretirement benefit plans Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter 2018-2022 Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months 2013 Defined Benefit Plan Expected Future Benefit Payments Year Five 2017 Defined Benefit Plan Expected Future Benefit Payments Year Four 2016 Defined Benefit Plan Expected Future Benefit Payments Year Three 2015 Defined Benefit Plan Expected Future Benefit Payments Year Two 2014 Defined Benefit Plan Expected Return On Plan Assets Expected return on plan assets Defined Benefit Plan Fair Value Of Plan Assets Plan assets at fair value at end of year Plan assets at fair value at beginning of year Plan assets at fair value Defined Benefit Plan Foreign Currency Exchange Rate Changes Benefit Obligation Currency effect Defined Benefit Plan Foreign Currency Exchange Rate Changes Plan Assets Currency effect Defined Benefit Plan Funded Status Of Plan Unfunded Liability Defined benefit plan health care cost trend rate current year. Defined Benefit Plan Health Care Cost Trend Rate Current Year Current medical cost trend rate Defined Benefit Plan Interest Cost Interest cost on projected benefit obligation Interest cost Defined benefit plan, net periodic benefit cost before curtailments. Defined Benefit Plan Net Periodic Benefit Cost Before Curtailments Total pension cost Defined Benefit Plans Disclosures Defined Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans [Domain] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plan Service Cost Service cost - benefits earned during the period Service cost Defined benefit plan target allocation percentage of assets. Defined Benefit Plan Target Allocation Percentage Of Assets Target Allocation Percentage of Assets, Total Defined benefit plan target allocation percentage of cash and cash equivalents range maximum. Defined Benefit Plan Target Allocation Percentage Of Cash And Cash Equivalents Range Maximum Target Allocation Percentage of Assets, Range Maximum Defined benefit plan target allocation percentage of cash and cash equivalents range minimum. Defined Benefit Plan Target Allocation Percentage Of Cash And Cash Equivalents Range Minimum Target Allocation Percentage of Assets, Range Minimum Defined Benefit Plan Target Plan Asset Allocations Range Maximum Target Allocation Percentage of Assets, Range Maximum Defined Benefit Plan Target Plan Asset Allocations Range Minimum Target Allocation Percentage of Assets, Range Minimum Defined Benefit Plan Ultimate Health Care Cost Trend Rate Ultimate medical cost trend rate Defined Benefit Plan Weighted Average Asset Allocations Investment of assets in government and government-related debt securities under US postretirement medical plan Target allocation of assets Defined benefit plan weighted average assumptions used in calculating benefit obligation and net periodic benefit cost for the postretirement medical plan. Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation And Net Periodic Benefit Cost For Postretirement Medical Plan Table [Text Block] Defined Benefit Plan Weighted Average Assumptions Used in Calculating Benefit Obligation and Net Periodic Benefit Cost for US Postretirement Medical Plan Defined benefit plan weighted average assumptions used in calculating benefit obligation. Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation Table [Text Block] Weighted-Average Assumed Discount Rate and Compensation Increases Used to Determine Projected Benefit Obligations for US and International Plans Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate Year that the rate reaches the ultimate trend rate Depreciation Depreciation expense relating to fixed assets Depreciation Depletion And Amortization Depn. & Amortn. Depreciation and amortization Derivative Asset Fair Value Net [Abstract] Derivative Assets Derivative By Nature [Axis] Derivative, by Nature [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Derivative Fair Value Of Derivative Asset Derivative Assets Derivative Fair Value Of Derivative Liability Derivative Liabilities Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Instruments And Hedging Activities Disclosure [Text Block] Derivative Instruments and Hedging Activities Derivative Instruments Gain Loss By Hedging Relationship [Axis] Hedging Relationship [Axis]