Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013 Country
Derivative [Line Items]
Number of countries in which Schlumberger conducts business	85
Recognized a cumulative net gain in equity relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges	$ 18,000,000
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	3,400,000,000
Short-term investments and Fixed income investments, held to maturity	3,600,000,000
Foreign exchange contracts
Derivative [Line Items]
Contracts outstanding in various foreign currencies (US dollar equivalent)	6,400,000,000
Foreign exchange contracts | Debt | Derivatives designated as hedges
Derivative [Line Items]
Contracts outstanding in various foreign currencies (US dollar equivalent)	$ 3,200,000,000