Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Fixed rate debt.

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Variable rate debt.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The number of countries in which the entity operates as of balance sheet date.

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Derivative Instruments and Hedging Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($) Country	Dec. 31, 2018	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Denominated debt issued			$ 1,100,000,000
Fixed rate debt aggregate, after taking into account the effects of the interest rate swaps	$ 13,500,000,000
Variable rate debt aggregate, after taking into account the effects of the interest rate swaps	$ 3,000,000,000
Number of countries in which Schlumberger generates revenue \| Country	120
Recognized a cumulative net gain in Accumulated other comprehensive loss relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges	$ 16,000,000
2.20% Senior Notes due 2020
Derivative [Line Items]
Notes, face amount			$ 500,000,000
Derivative swap interest rate			2.20%
Promissory note interest rate	2.20%	2.20%
2.65% Senior Notes due 2022
Derivative [Line Items]
Notes, face amount			$ 600,000,000
Derivative swap interest rate			2.65%
Promissory note interest rate	2.65%	2.65%
Cross currency swaps
Derivative [Line Items]
Notional amount of interest rate swap			$ 1,100,000,000
Cross currency swaps \| 2.20% Senior Notes due 2020
Derivative [Line Items]
Promissory note interest rate			1.97%
Cross currency swaps \| 2.65% Senior Notes due 2022
Derivative [Line Items]
Promissory note interest rate			2.52%
Foreign exchange contracts
Derivative [Line Items]
Notional amount of interest rate swap	$ 4,000,000,000
Foreign exchange contracts \| Debt \| Derivatives designated as hedges
Derivative [Line Items]
Notional amount of interest rate swap	$ 1,100,000,000