Accounts payable and accrued liabilities Estimated liability for taxes on income Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss) Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation Tax benefit on stock options Receivables, allowance for doubtful accounts Amendment Flag Net assets purchased during the period, excluding net assets acquired in business combinations. Acquisitions Assets Assets, Total ASSETS Assets, Current Assets, Current, Total Current Assets Cash Cash and Cash Equivalents, at Carrying Value Cash, end of year Cash, beginning of year Net increase (decrease) in cash before translation effect Net increase (decrease) in cash before translation effect Cash flow from discontinued operations - operating activities Leases and Lease Commitments Dividends declared, per share Common Stock Issued Common stock Total comprehensive income Total comprehensive income Comprehensive income: 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. Contingencies Convertible Debt, Current Convertible debentures Convertible Debt, Noncurrent Convertible Debentures Cost of revenue Expenses Current Fiscal Year End Date Long-term Debt and Debt Facility Agreements Deferred income taxes Deferred Tax Assets, Net, Current Deferred taxes Deferred Tax Assets, Net, Noncurrent Deferred Taxes Depreciation and amortization Derivative Instruments and Hedging Activities Stock Compensation Plans Dividends declared ($0.84 per share in 2009, $0.84 per share in 2008, and $0.70 per share in 2007) Dividends declared ($0.84 per share in 2009, $0.84 per share in 2008, and $0.70 per share in 2007) Dividend payable Document Information [Text Block] Document Period End Date Document Type Earnings Per Share, Basic Net Income Basic earnings per share of Schlumberger: Earnings Per Share, Diluted Net Income Diluted earnings per share of Schlumberger: Translation effect on cash Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Current Reporting Status Entity [Domain] Entity Filer Category Entity Public Float Entity Registrant Name Entity [Text Block] Entity Voluntary Filers Entity Well-known Seasoned Issuer Equity Component [Domain] Drilling Fluids Joint Venture Excess Tax Benefit from Share-based Compensation, Financing Activities Tax benefit on stock options General & administrative Goodwill This block of text may be used to disclose all or part of the information related to goodwill. Goodwill Disclosure [Text Block] Goodwill Fixed Income Investments, held to maturity Income (Loss) from Continuing Operations Attributable to Parent Income from Continuing Operations Sum of operating profit and nonoperating income (expense), including IncomeLoss from Equity Method Investments, before income taxes. Income from Continuing Operations before taxes Income from Continuing Operations before taxes Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income from Continuing Operations Income (Loss) from Continuing Operations, Per Basic Share Income from Continuing Operations Income (Loss) from Continuing Operations, Per Diluted Share Income from Continuing Operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (Loss) from Discontinued Operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income (Loss) from Discontinued Operations Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share Income (Loss) from Discontinued Operations Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share Income (Loss) from Discontinued Operations Earnings of companies carried at equity, less dividends received Earnings of companies carried at equity, less dividends received Income Statement [Abstract] Income Tax Expense Taxes on income (Decrease) increase in accounts payable and accrued liabilities (Decrease) increase in estimated liability for taxes on income Decrease (increase) in inventories Decrease (increase) in inventories Change in operating assets and liabilities: Other - net Other - net Increase in other liabilities Pension and other postretirement benefits expense Decrease (increase) in receivables Decrease (increase) in receivables The net change in the beginning and end of period Other Current Assets balances. Decrease (increase) in other current assets Decrease (increase) in other current assets Intangible Assets Disclosure [Text Block] Intangible Assets Intangible Assets, Net (Excluding Goodwill) Intangible Assets Interest 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. Interest and other income, net Inventory Inventories Investments in Affiliated Companies Legal Entity [Axis] Liabilities Liabilities, Total Liabilities and Stockholders' Equity Liabilities and Stockholders' Equity, Total LIABILITIES AND EQUITY Liabilities, Current Liabilities, Current, Total Current Liabilities Long-term debt - current portion Marketing Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Acquisition of noncontrolling interest Capitalized costs directly incurred in acquiring and processing of seismic surveys that are licensed on a nonexclusive basis, net of amortization. Multiclient Seismic Data Disclosure of the carrying amount of multiclient seismic data based on completed and in-process seismic surveys. Multiclient Seismic Data [Text Block] Multiclient Seismic Data Business Description NET CASH USED IN FINANCING ACTIVITIES NET CASH USED IN FINANCING ACTIVITIES Cash flows from financing activities: NET CASH USED IN INVESTING ACTIVITIES NET CASH USED IN INVESTING ACTIVITIES Cash flows from investing activities: NET CASH PROVIDED BY OPERATING ACTIVITIES NET CASH PROVIDED BY OPERATING ACTIVITIES Cash flows from operating activities: Adjustments to reconcile net income to net cash provided by operating activities: Net Income attributable to Schlumberger Net Income Net income attributable to noncontrolling interests Net income attributable to noncontrolling interests Schlumberger amounts attributable to: Noncontrolling Interests Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] Other current assets Other Assets Deferred employee benefits liabilities Changes in fair value of derivatives Currency translation adjustments Other Liabilities Other Long-term Debt Other non-cash items Other business acquisitions and investments, net of cash acquired Other business acquisitions and investments, net of cash acquired Parent Company [Member] The net cash outflow from capitalized costs directly incurred in acquiring and processing of seismic surveys that are licensed on a nonexclusive basis. Multiclient seismic data capitalized Payments for (Proceeds from) Other Investing Activities Other Payments for Repurchase of Equity Stock repurchase program Dividends paid Dividends paid Acquisition of Eastern Echo, net of cash acquired Acquisition of Eastern Echo, net of cash acquired Purchase of investments, net Purchase of investments, net Capital expenditures Capital expenditures Pension and other postretirement benefits funding Pension and other postretirement benefits funding Pension and other postretirement benefits curtailment charge Pension and Other Benefit Plans Postretirement Benefits Proceeds from issuance of long-term debt Net (decrease) increase in short-term borrowings Proceeds from exercise of stock options Proceeds from employee stock purchase plan Net Income Net Income Fixed Assets Fixed Assets less accumulated depreciation Receivables less allowance for doubtful accounts (2009 - $160; 2008 - $133) Repayment of long-term debt Repayment of long-term debt Research & engineering Charges and Credits Retained Earnings (Accumulated Deficit) Retained earnings Retained Earnings Revenue Segment Information Stock-based compensation expense Number of shares of stock held by shareholders. Shares, Outstanding Ending Balance Beginning Balance Short-term borrowings Short-term investments Summary of Accounting Policies Statement, Equity Components [Axis] Statement [Line Items] Statement of Cash Flows [Abstract] Statement of Financial Position [Abstract] Statement of Stockholders' Equity [Abstract] Statement [Table] Shares granted to Directors Schlumberger stockholders' equity Schlumberger stockholders' equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Ending Balance Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total Equity Stockholders' Equity Other Other Issued on conversions of debentures Stock Issued During Period, Shares, Employee Stock Purchase Plans Shares issued under employee stock purchase plan Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Vesting of restricted stock Stock Issued During Period, Shares, Stock Options Exercised Shares sold to optionees less shares exchanged Shares issued on conversions of debentures Stock Issued During Period, Value, Employee Stock Purchase Plan Shares issued under employee stock purchase plan Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Vesting of restricted stock Stock-based compensation cost Stock Issued During Period, Value, Stock Options Exercised Shares sold to optionees less shares exchanged This label includes additional information concerning acquisitions, interest and income taxes paid. Supplementary Information Trading Symbol Common Stock in Treasury Stock repurchase program Treasury stock Treasury stock Treasury Stock, Value, Acquired, Cost Method Stock repurchase program Assuming dilution Average shares outstanding Basic