Entity Central Index Key Document and entity information. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding 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. Equity method investment other than temporary impairment and foreign currency devaluation loss. Income Statement [Abstract] Statement [Table] Statement [Table] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Services Service [Member] Product Product [Member] Statement [Line Items] Statement [Line Items] Revenue Revenues [Abstract] Total Revenue Revenue From Contract With Customer Excluding Assessed Tax Interest & other income Interest Income And Other Expenses Costs And Expenses [Abstract] Cost of services and sales Cost Of Goods And Services Sold Research & engineering Research And Development Expense General & administrative General And Administrative Expense Impairments & other Equity Method Investment Other Than Temporary Impairment And Foreign Currency Devaluation Loss Merger & integration Business Combination Integration Related Costs Interest Interest Expense Income before taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Tax expense Income Tax Expense Benefit Net income (loss) Profit Loss Net income (loss) attributable to noncontrolling interests Net Income Loss Attributable To Noncontrolling Interest Net income (loss) attributable to Schlumberger Net Income Loss Basic earnings (loss) per share of Schlumberger Earnings Per Share Basic Diluted earnings (loss) per share of Schlumberger Earnings Per Share Diluted Average shares outstanding: Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Assuming dilution Weighted Average Number Of Diluted Shares Outstanding Statement Of Income And Comprehensive Income [Abstract] Net income (loss) Currency translation adjustments Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease [Abstract] Unrealized net change arising during the period Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent Marketable securities Other Comprehensive Income Available For Sale Securities Adjustment Net Of Tax Period Increase Decrease [Abstract] Unrealized loss arising during the period Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Cash flow hedges Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease [Abstract] Net gain (loss) on cash flow hedges Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax Reclassification to net income (loss) of net realized (gain) loss Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Net Of Tax Pension and other postretirement benefit plans Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract] Amortization to net income of net actuarial loss Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax Amortization to net income of net prior service (credit) cost Other Comprehensive Income Loss Amortization Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax Income taxes on pension and other postretirement benefit plans Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax Comprehensive income (loss) Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive income (loss) attributable to Schlumberger Comprehensive Income Net Of Tax Capitalized costs directly incurred in acquiring and processing of seismic surveys that are licensed on a nonexclusive basis, net of amortization. Short term borrowings and long term debt current. Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets Assets Current [Abstract] Cash Cash Short-term investments Short Term Investments Receivables less allowance for doubtful accounts (2018 - $249; 2017 - $241) Receivables Net Current Inventories Inventory Net Other current assets Other Assets Current Current assets total Assets Current Investments in Affiliated Companies Investments In Affiliates Subsidiaries Associates And Joint Ventures Fixed Assets less accumulated depreciation Property Plant And Equipment Net Multiclient Seismic Data Multiclient Seismic Data Goodwill Goodwill Intangible Assets Finite Lived Intangible Assets Net Other Assets Other Assets Noncurrent Total Assets Assets LIABILITIES AND EQUITY Liabilities And Stockholders Equity [Abstract] Current Liabilities Liabilities Current [Abstract] Accounts payable and accrued liabilities Accounts Payable And Accrued Liabilities Current Estimated liability for taxes on income Accrued Income Taxes Current Short-term borrowings and current portion of long-term debt Short Term Borrowings And Long Term Debt Current Dividends payable Dividends Payable Current Current Liabilities Total Liabilities Current Long-term Debt Long Term Debt Noncurrent Postretirement Benefits Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent Deferred Taxes Deferred Tax Liabilities Noncurrent Other Liabilities Other Liabilities Noncurrent Total Liabilities Liabilities Equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Common stock Common Stock Value Treasury stock Treasury Stock Value Retained earnings Retained Earnings Accumulated Deficit Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Schlumberger stockholders' equity Stockholders Equity Noncontrolling interests Minority Interest Total equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Liabilities and stockholders equity Liabilities And Stockholders Equity Allowance for doubtful accounts on receivable Allowance For Doubtful Accounts Receivable Current The net cash outflow from capitalized costs directly incurred in acquiring and processing of seismic surveys that are licensed on a nonexclusive basis. Statement Of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net income Adjustments to reconcile net income to cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Impairments and other charges Other Asset Impairment Charges Depreciation and amortization Depreciation Depletion And Amortization Stock-based compensation expense Share Based Compensation Pension and other postretirement benefits funding Pension And Other Postretirement Benefit Contributions Earnings of equity method investments, less dividends received Income Loss From Equity Method Investments Net Of Dividends Or Distributions Change in assets and liabilities: Increase Decrease In Operating Capital [Abstract] Increase in receivables Increase Decrease In Receivables Increase in inventories Increase Decrease In Inventories Decrease (increase) in other current assets Increase Decrease In Other Current Assets Increase in other assets Increase Decrease In Other Noncurrent Assets Decrease in accounts payable and accrued liabilities Increase Decrease In Accounts Payable And Accrued Liabilities Decrease in estimated liability for taxes on income Increase Decrease In Accrued Income Taxes Payable Decrease in other liabilities Increase Decrease In Other Operating Liabilities Other Increase Decrease In Other Operating Capital Net NET CASH PROVIDED BY OPERATING ACTIVITIES Net Cash Provided By Used In Operating Activities Continuing Operations Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Capital expenditures Payments To Acquire Property Plant And Equipment SPM investments Payments To Acquire Investments Multiclient seismic data costs capitalized Payments For Proceeds From Capitalized Costs Support Equipment And Facilities Business acquisitions and investments, net of cash acquired Payments To Acquire Businesses And Interest In Affiliates Sale of investments, net Payments For Proceeds From Investments Other Payments For Proceeds From Other Investing Activities NET CASH PROVIDED BY INVESTING ACTIVITIES Net Cash Provided By Used In Investing Activities Continuing Operations Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Dividends paid Payments Of Dividends Proceeds from employee stock purchase plan Proceeds From Stock Plans Proceeds from exercise of stock options Proceeds From Stock Options Exercised Stock repurchase program Payments For Repurchase Of Equity Proceeds from issuance of long-term debt Proceeds From Issuance Of Long Term Debt Repayment of long-term debt Repayments Of Long Term Debt Net decrease in short-term borrowings Proceeds From Repayments Of Short Term Debt Other Proceeds From Payments For Other Financing Activities NET CASH USED IN FINANCING ACTIVITIES Net Cash Provided By Used In Financing Activities Continuing Operations Net decrease in cash before translation effect Cash Period Increase Decrease Excluding Exchange Rate Effect Translation effect on cash Effect Of Exchange Rate On Cash Cash, beginning of period Cash, end of period Number of share options exercised during the current period less shares exchanged. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Issued Common Stock [Member] Common Stock In Treasury Treasury Stock [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income [Member] Noncontrolling Interests Noncontrolling Interest [Member] Balance Balance, shares Shares Outstanding Treasury shares, Balance Treasury Stock Shares Currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Changes in unrealized gain on marketable securities Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax Changes in fair value of cash flow hedges Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax Pension and other postretirement benefit plans Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax Shares sold to optionees, less shares exchanged Stock Issued During Period Value Stock Options Exercised Shares sold to optionees, less shares exchanged, shares Stock Issued During Period Shares Stock Options Exercised Less Shares Exchanged Vesting of restricted stock Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures Vesting of restricted stock, shares Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures Shares issued under employee stock purchase plan Stock Issued During Period Value Employee Stock Purchase Plan Shares issued under employee stock purchase plan, shares Stock Issued During Period Shares Employee Stock Purchase Plans Stock repurchase program Treasury Stock Value Acquired Cost Method Stock repurchase program, shares Treasury Stock Shares Acquired Stock-based compensation expense Stock Issued During Period Value Share Based Compensation Dividends declared Dividends Cash Other Stockholders Equity Other Balance Balance, shares Treasury shares, Balance Dividends declared, per share Common Stock Dividends Per Share Declared Organization Consolidation And Presentation Of Financial Statements [Abstract] Basis of Presentation Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Restructuring And Related Activities [Abstract] Charges and Credits Restructuring And Related Activities Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Inventory Disclosure [Abstract] Inventories Inventory Disclosure [Text Block] Property Plant And Equipment [Abstract] Fixed Assets Property Plant And Equipment Disclosure [Text Block] Disclosure of the carrying amount of multiclient seismic data based on completed and in-process seismic surveys. Multiclient seismic data. Multiclient Seismic Data [Abstract] Multiclient Seismic Data Multiclient Seismic Data [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Intangible Assets Intangible Assets Disclosure [Text Block] Debt Disclosure [Abstract] Long-term Debt Long Term Debt [Text Block] Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Derivative Instruments And Hedging Activities Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Contingencies Loss Contingency Disclosures Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Compensation And Retirement Disclosure [Abstract] Pension and Other Postretirement Benefit Plans Pension And Other Postretirement Benefits Disclosure [Text Block] Equity [Abstract] Accumulated Other Comprehensive Loss Comprehensive Income Note [Text Block] Recently adopted accounting pronouncement. Recently Adopted Accounting Pronouncement Recently Adopted Accounting Pronouncement Policy [Text Block] Recently Issued Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Summary of charges and credits. Summary of Charges and Credits Summary Of Charges And Credits Table [Text Block] Reconciliation of Earnings (Loss) Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Summary of Inventory Schedule Of Inventory Current Table [Text Block] Summary of Fixed Assets Property Plant And Equipment [Text Block] Depreciation expense relating to fixed assets. Depreciation Expense Relating to Fixed Assets Depreciation Expense Relating To Fixed Assets Table [Text Block] Disclosure of the carrying amount of multiclient seismic data based on completed and in-process seismic surveys. Change in Carrying Amount of Multiclient Seismic Data Multiclient Seismic Data Table [Text Block] Schedule of Intangible Assets by Major Class Schedule Of Finite Lived Intangible Assets Table [Text Block] Amortization expense charged to income for intangible assets. Amortization Expense Charged to Income for Intangible Assets Amortization Expense Charged To Income For Intangible Assets Table [Text Block] Summary of Long-term Debt Schedule Of Debt Instruments [Text Block] Effect of Derivative Instruments Designated as Fair Value and Cash Flow Hedges and Not Designated as Hedges on Consolidated Statement of Income Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance [Text Block] Schedule of Segment Reporting Information, by Segment Schedule Of Segment Reporting Information By Segment [Text Block] Revenue by Geographic Area Reconciliation Of Revenue From Segments To Consolidated [Text Block] Summary of geographical segment revenue disaggregated by group. Summary of North America and International Revenue Disaggregated by Group Summary Of Geographical Segment Revenue Disaggregated By Group Table [Text Block] Net Pension Cost (Credit) for Schlumberger Pension Plans and US Postretirement Medical Plan Schedule Of Net Benefit Costs Table [Text Block] Schedule of Accumulated Other Comprehensive Loss Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Revenue recognition, period of recognition. Organization and summary of significant accounting policies. Organization and summary of significant accounting policies. Organization And Summary Of Significant Accounting Policies [Table] Organization And Summary Of Significant Accounting Policies [Table] Range Range [Axis] Range Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Receivables less allowance for doubtful accounts. Receivables Less Allowance for Doubtful Accounts Receivables Less Allowance For Doubtful Accounts [Member] Accounts Payable and Accrued Liabilities Accounts Payable And Accrued Liabilities [Member] Adjustments for New Accounting Pronouncements Adjustments For New Accounting Pronouncements [Axis] Type of Adoption Type Of Adoption [Member] ASU No. 2016-02 Accounting Standards Update201602 [Member] Organization And Summary Of Significant Accounting Policies [Line Items] Organization And Summary Of Significant Accounting Policies [Line Items] Revenue recognition period Revenue Recognition Period Of Recognition Revenue in excess of billings Billings In Excess Of Cost Percentage of deferred revenue expected to be recognized within one year. Total backlog Deferred Revenue Percentage of revenue expected to be recognized over next 12 months Percentage Of Deferred Revenue Expected To Be Recognized Within One Year Billings and cash collections in excess of revenue Costs In Excess Of Billings On Uncompleted Contracts Or Programs New accounting pronouncement or change in accounting principle effect of additional assets and liabilities New Accounting Pronouncement Or Change In Accounting Principle Cumulative Effect Of Change On Equity Or Net Assets1 Charges and credits pretax. Charges and credits. Charges and credits. Charges and credits. Charges And Credits [Table] Charges And Credits [Table] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Impairments and other. Impairments and Other Impairments And Other [Member] Restructuring Type Restructuring Cost And Reserve [Axis] Type of Restructuring Type Of Restructuring [Domain] Headcount Reductions Employee Severance [Member] Promissory note fair value adjustment and other. Promissory Note Fair Value Adjustment and Other Promissory Note Fair Value Adjustment And Other [Member] Merger and Integration. Merger and Integration Merger And Integration [Member] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Cameron International Corporation. Cameron International Corporation Cameron International Corporation [Member] Merger-related employee benefits. Merger-related employee benefits Merger Related Employee Benefits [Member] Income Tax Authority Income Tax Authority [Axis] Income Tax Authority Income Tax Authority [Domain] Domestic tax reform. US tax reform Domestic Tax Reform [Member] Tax Period Tax Period [Axis] Tax Period Tax Period [Domain] Tax Year2018 Tax Year2018 [Member] Charges And Credits [Line Items] Charges And Credits [Line Items] Charges and credits, pre tax Charges And Credits Pretax Charges and credits Charges And Credits Promissory note in exchange of accounts receivable. Promissory note term. Promissory note in exchange of accounts receivable Promissory Note In Exchange Of Accounts Receivable Promissory note term Promissory Note Term Promissory note interest rate Debt Instrument Interest Rate Stated Percentage Charges and credits tax. Charges and credits impact of non controlling interest. Charges and credits, Pretax Charges and credits, Tax Charges And Credits Tax Charges and credits, Noncontrolling Interests Charges And Credits Impact Of Non Controlling Interest Charges and credits, Net Corporate income tax rate. Reduced corporate income tax rate Corporate Income Tax Rate Charge relating to one-time mandatory tax on previously deferred foreign earnings Deferred Tax Liabilities Undistributed Foreign Earnings Tax credits resulting from remeasurement of net deferred tax liabilities Income Tax Credits And Adjustments Schlumberger Net Income (Loss) Net Income Loss [Abstract] Basic Net Income Loss Available To Common Stockholders Basic Diluted Net Income Loss Available To Common Stockholders Diluted Average Shares Outstanding Assumed exercise of stock options Incremental Common Shares Attributable To Call Options And Warrants Unvested restricted stock Incremental Common Shares Attributable To Nonvested Shares With Forfeitable Dividends Diluted Earnings (loss) per Share Earnings Per Share Reconciliation [Abstract] Basic Diluted Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Raw materials & field materials Inventory Raw Materials And Supplies Work in progress Inventory Work In Process Finished goods Inventory Finished Goods Inventories Property, plant & equipment Property Plant And Equipment Gross Less: Accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Fixed assets less accumulated depreciation Depreciation expense relating to fixed assets Depreciation Multiclient seismic data capitalized in period. Multiclient seismic data charged to cost of goods sold and services. Balance at December 31, 2017 Capitalized in period Multiclient Seismic Data Capitalized In Period Charged to expense Multiclient Seismic Data Charged To Cost Of Goods Sold And Services Balance at June 30, 2018 Schedule Of Finite Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Customer Relationships Customer Relationships [Member] Technology/Technical Know-how Developed Technology Rights [Member] Tradenames Trade Names [Member] Other Other Intangible Assets [Member] Finite Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Gross Book Value Finite Lived Intangible Assets Gross Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Net Book Value Amortization expense Amortization Of Intangible Assets Finite lived intangible assets amortization expense year six. Estimated amortization charged to income, remaining two quarters of 2018 Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year Estimated amortization charged to income, 2019 Finite Lived Intangible Assets Amortization Expense Year Two Estimated amortization charged to income, 2020 Finite Lived Intangible Assets Amortization Expense Year Three Estimated amortization charged to income, 2021 Finite Lived Intangible Assets Amortization Expense Year Four Estimated amortization charged to income, 2022 Finite Lived Intangible Assets Amortization Expense Year Five Estimated amortization charged to income, 2023 Finite Lived Intangible Assets Amortization Expense Year Six Debt Instrument [Table] Debt Instrument [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Four point zero zero percent senior notes due two thousand twenty five. 4.00% Senior Notes due 2025 Four Point Zero Zero Percent Senior Notes Due Two Thousand Twenty Five [Member] Three point three zero percent senior notes due two thousand twenty one. 3.30% Senior Notes due 2021 Three Point Three Zero Percent Senior Notes Due Two Thousand Twenty One [Member] Three point zero zero percent senior notes due two thousand twenty. 3.00% Senior Notes due 2020 Three Point Zero Zero Percent Senior Notes Due Two Thousand Twenty [Member] Three point six five percent senior notes due two thousand twenty three. 3.65% Senior Notes due 2023 Three Point Six Five Percent Senior Notes Due Two Thousand Twenty Three [Member] Senior notes four point two zero percent due two thousand twenty one. 4.20% Senior Notes due 2021 Senior Notes Four Point Two Zero Percent Due Two Thousand Twenty One [Member] Senior notes two point four zero percent due two thousand and twenty two. 2.40% Senior Notes due 2022 Senior Notes Two Point Four Zero Percent Due Two Thousand And Twenty Two [Member] Three point six three percent senior notes due two thousand and twenty two. 3.63% Senior Notes due 2022 Three Point Six Three Percent Senior Notes Due Two Thousand And Twenty Two [Member] Two point six five percent senior notes due two thousand twenty two. 2.65% Senior Notes due 2022 Two Point Six Five Percent Senior Notes Due Two Thousand Twenty Two [Member] Two point two zero percent senior notes due two thousand twenty. 2.20% Senior Notes due 2020 Two Point Two Zero Percent Senior Notes Due Two Thousand Twenty [Member] Seven point zero zero percent notes due two thousand thirty eight. 7.00% Notes due 2038 Seven Point Zero Zero Percent Notes Due Two Thousand Thirty Eight [Member] Four point five zero percent notes due two thousand twenty one. 4.50% Notes due 2021 Four Point Five Zero Percent Notes Due Two Thousand Twenty One [Member] Five point nine five percent notes due two thousand forty one. 5.95% Notes due 2041 Five Point Nine Five Percent Notes Due Two Thousand Forty One [Member] Three point six zero percent notes due two thousand twenty two. 3.60% Notes due 2022 Three Point Six Zero Percent Notes Due Two Thousand Twenty Two [Member] Five point one three percent notes due two thousand forty three. 5.13% Notes due 2043 Five Point One Three Percent Notes Due Two Thousand Forty Three [Member] Four point zero zero percent notes due two thousand twenty three. 4.00% Notes due 2023 Four Point Zero Zero Percent Notes Due Two Thousand Twenty Three [Member] Three point seven zero percent notes due two thousand and twenty four. 3.70% Notes due 2024 Three Point Seven Zero Percent Notes Due Two Thousand And Twenty Four [Member] Guaranteed notes zero point six three percent due two thousand nineteen. 0.63% Guaranteed Notes due 2019 Guaranteed Notes Zero Point Six Three Percent Due Two Thousand Nineteen [Member] Guaranteed notes one point five zero percent due two thousand nineteen. 1.50% Guaranteed Notes due 2019 Guaranteed Notes One Point Five Zero Percent Due Two Thousand Nineteen [Member] Debt, other. Other Debt Other [Member] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Commercial paper borrowings Commercial Paper [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term debt, carrying amount Debt instrument maturity. Debt instrument interest rate Debt instrument maturity date Debt Instrument Maturity Year Long-term debt, fair value Debt Instrument Fair Value Long-term debt Long Term Debt Floating interest rate on securities. Derivative [Table] Derivative [Table] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate L I B O R [Member] Derivative Instrument Derivative Instrument Risk [Axis] Derivative Contract Derivative Contract Type [Domain] Cross currency swap Cross Currency Interest Rate Contract [Member] Fixed rate debt. Fixed Rate Debt Fixed Rate Debt [Member] Floating rate debt. Floating Rate Debt Floating Rate Debt [Member] Foreign exchange contracts Foreign Exchange Contract [Member] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Debt Debt [Member] Hedging Designation Hedging Designation [Axis] Hedging Designation Hedging Designation [Domain] Derivatives designated as hedges Designated As Hedging Instrument [Member] Derivative [Line Items] Derivative [Line Items] Notional amount of interest rate swap Derivative Notional Amount Notes, face amount Debt Instrument Face Amount Derivative swap interest rate Derivative Swaption Interest Rate Floating interest rate on securities Floating Interest Rate On Securities Basis point Derivative Basis Spread On Variable Rate Denominated debt issued Debt Instrument Carrying Amount Fixed rate debt. Variable rate debt. Fixed rate debt aggregate, after taking into account the effects of the interest rate swaps Fixed Rate Debt Variable rate debt aggregate, after taking into account the effects of the interest rate swaps Variable Rate Debt Short-term investments Marketable Securities Number of countries in which Schlumberger conducts business Number Of Countries In Which Entity Operates Recognized a cumulative net (loss) in Accumulated Other Comprehensive Loss relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings Net Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Hedging Relationship Derivative Instruments Gain Loss By Hedging Relationship [Axis] Hedging Relationship Hedging Relationship [Domain] Fair Value Hedging Fair Value Hedging [Member] Cash Flow Hedging Cash Flow Hedging [Member] Derivatives not designated as hedges Nondesignated [Member] Interest expense Interest Expense [Member] Cost of services/sales Cost Of Sales [Member] Cost of services/sales Derivative Instruments Gain Loss [Line Items] Derivative Instruments Gain Loss [Line Items] Gain (Loss) Recognized in Income (Loss) Derivative Gain Loss On Derivative Net Schedule Of Segment Reporting Information By Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Consolidation Items Consolidation Items [Axis] Consolidation Items Consolidation Items [Domain] Operating Segments Operating Segments [Member] Eliminations & other Material Reconciling Items [Member] Segments Statement Business Segments [Axis] Segments Segment [Domain] Reservoir characterization. Reservoir Characterization Reservoir Characterization [Member] Drilling. Drilling Drilling [Member] Production. Production Production [Member] Cameron. Cameron Cameron [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenue Income Before Taxes Corporate and other expenses. Restructuring and other charges. Pretax operating income Operating Income Loss Corporate & other Corporate And Other Expenses Interest income Interest Income Operating Interest expense Charges and credits Restructuring And Other Charges Eliminations & other Geography Eliminations [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] North America North America [Member] Latin America Latin America [Member] Region of Europe, CIS, and Africa. Europe/CIS/Africa Europe C I S Africa [Member] Middle East & Asia Middle East [Member] International Non Us [Member] Other All Other Segments [Member] Schedule Of Defined Benefit Plans Disclosures [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Retirement Plan Sponsor Location Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location Retirement Plan Sponsor Location [Domain] US Plan Assets Domestic Plan [Member] US UNITED STATES International Foreign Plan [Member] Retirement Plan Type Retirement Plan Type [Axis] Retirement Plan Type Retirement Plan Type [Domain] Postretirement medical plan Defined Benefit Postretirement Health Coverage [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost Defined Benefit Plan Service Cost Interest cost Defined Benefit Plan Interest Cost Expected return on plan assets Defined Benefit Plan Expected Return On Plan Assets Amortization of prior service cost Defined Benefit Plan Amortization Of Prior Service Cost Credit Amortization of net loss Defined Benefit Plan Amortization Of Gains Losses Total pension cost Defined Benefit Plan Net Periodic Benefit Cost Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income Loss [Table] Currency Translation Adjustments Accumulated Translation Adjustment [Member] Marketable Securities Accumulated Net Unrealized Investment Gain Loss [Member] Cash Flow Hedges Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Pension and Other Postretirement Benefit Plans Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income Loss [Line Items] Other comprehensive gain (loss) before reclassifications Other Comprehensive Income Loss Before Reclassifications Before Tax Amounts reclassified from accumulated other comprehensive loss Reclassification From Accumulated Other Comprehensive Income Current Period Before Tax Net other comprehensive income Other Comprehensive Income Loss Net Of Tax