CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,964	$ 1,725	$ 5,188	$ 5,091
Currency translation adjustments
Unrealized net change arising during the period	(146)	95	(176)	(139)
Marketable securities
Unrealized (loss) gain arising during the period	(162)	(25)	(132)	58
Derivatives
Net derivatives (loss) gain on hedge transactions (see Note 11)	(151)	76	(138)	(27)
Reclassification to net income of net realized loss (gain) (see Note 11)	53	(30)	59	15
Actuarial loss
Actuarial loss arising during the period		(18)		(23)
Amortization to net income of net actuarial loss (see Note 15)	32	73	132	224
Prior service cost
Amortization to net income of net prior service cost (see Note 15)	40	31	96	94
Income taxes on pension and other postretirement benefit plans	(8)	(9)	(28)	(40)
Comprehensive income	1,622	1,918	5,001	5,253
Comprehensive income attributable to noncontrolling interests	15	10	52	23
Comprehensive income attributable to Schlumberger	$ 1,607	$ 1,908	$ 4,949	$ 5,230