Derivative Instruments and Hedging Activities - Additional Information (Detail)	12 Months Ended				12 Months Ended
	Dec. 31, 2014 USD ($) Country	Dec. 31, 2013 1.50% Guaranteed Notes due 2019 EUR (€)	Dec. 31, 2013 Cross currency swap EUR (€)	Dec. 31, 2013 Fixed Rate Debt 1.50% Guaranteed Notes due 2019	Dec. 31, 2014 Floating Rate Debt 1.50% Guaranteed Notes due 2019	Dec. 31, 2014 Foreign exchange contracts USD ($)	Dec. 31, 2014 Foreign exchange contracts Debt Derivatives designated as hedges USD ($)	Dec. 31, 2014 London Interbank Offered Rate (LIBOR) Floating Rate Debt 1.50% Guaranteed Notes due 2019
Derivative [Line Items]
Notional amount of interest rate swap			€ 500,000,000			$ 6,800,000,000	$ 2,500,000,000
Guaranteed notes face amount		500,000,000
Derivative swap interest rate				1.50%
Floating interest rate on securities					three-month LIBOR plus approximately 64 basis points
Basis point								0.64%
Fixed rate debt aggregate, after taking into account the effects of the interest rate swaps	9,000,000,000
Variable rate debt aggregate, after taking into account the effects of the interest rate swaps	4,300,000,000
Short-term investments and fixed income investments, held to maturity	4,800,000,000
Number of countries in which Schlumberger conducts business	85
Percentage of revenue denominated in domestic currency	81.00%
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	$ (96,000,000)