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

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Fixed rate debt.

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Floating interest rate on securities.

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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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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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No definition available.

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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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Amount of investment in marketable security.

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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)	9 Months Ended
	Sep. 30, 2018 USD ($) Country	Dec. 31, 2017 USD ($)	Jun. 30, 2017	Dec. 31, 2013 EUR (€)
Derivative [Line Items]
Denominated debt issued		$ 1,100,000,000
Promissory note interest rate			6.50%
Fixed rate debt aggregate, after taking into account the effects of the interest rate swaps	$ 13,300,000,000
Variable rate debt aggregate, after taking into account the effects of the interest rate swaps	4,100,000,000
Short-term investments	1,400,000,000
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	$ (5,000,000)
Minimum
Derivative [Line Items]
Number of countries in which Schlumberger conducts business \| Country	85
1.50% Guaranteed Notes due 2019
Derivative [Line Items]
Notes, face amount \| €				€ 500,000,000
Promissory note interest rate	1.50%	1.50%
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 swap
Derivative [Line Items]
Notional amount of interest rate swap		$ 1,100,000,000		€ 500,000,000
Cross currency swap \| 2.20% Senior Notes due 2020
Derivative [Line Items]
Promissory note interest rate		1.97%
Cross currency swap \| 2.65% Senior Notes due 2022
Derivative [Line Items]
Promissory note interest rate		2.52%
Fixed Rate Debt \| 1.50% Guaranteed Notes due 2019
Derivative [Line Items]
Derivative swap interest rate				1.50%
Floating Rate Debt \| 1.50% Guaranteed Notes due 2019
Derivative [Line Items]
Floating interest rate on securities	three-month LIBOR plus approximately 64 basis points
Foreign exchange contracts
Derivative [Line Items]
Notional amount of interest rate swap	$ 5,000,000,000
Foreign exchange contracts \| Debt \| Derivatives designated as hedges
Derivative [Line Items]
Notional amount of interest rate swap	$ 1,900,000,000
London Interbank Offered Rate (LIBOR) \| Floating Rate Debt \| 1.50% Guaranteed Notes due 2019
Derivative [Line Items]
Basis point	0.64%