Derivative Instruments and Hedging Activities - Additional Information (Detail)	9 Months Ended					9 Months Ended	12 Months Ended
	Sep. 30, 2014 USD ($) Country	Dec. 31, 2013 1.50% Guaranteed Notes due 2019 EUR (€)	Sep. 30, 2014 Foreign exchange contracts USD ($)	Sep. 30, 2014 Foreign exchange contracts Debt Derivatives designated as hedges USD ($)	Dec. 31, 2013 Fixed Rate Debt 1.50% Guaranteed Notes due 2019	Sep. 30, 2014 Floating Rate Debt 1.50% Guaranteed Notes due 2019	Dec. 31, 2013 Floating Rate Debt 1.50% Guaranteed Notes due 2019
Derivative [Line Items]
Number of countries in which Schlumberger conducts business	85
Recognized a cumulative net loss in equity relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges	$ (50,000,000)
Notional amount of interest rate swap		500,000,000	6,200,000,000	2,500,000,000
Guaranteed notes face amount		500,000,000
Derivative swap interest rate					1.50%
Senior note floating interest rate						three-month LIBOR plus approximately 64 basis points.
Basis points							0.64%
Fixed rate debt aggregate, after taking into account the effects of the interest rate swaps	9,100,000,000
Variable rate debt aggregate, after taking into account the effects of the interest rate swaps	4,000,000,000
Short-term investments and Fixed income investments, held to maturity	$ 4,100,000,000