CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,003	$ 1,964	$ 3,125	$ 5,188
Currency translation adjustments
Unrealized net change arising during the period	(166)	(146)	(260)	(176)
Marketable securities
Unrealized loss arising during the period	(26)	(162)	(36)	(132)
Cash flow hedges
Net loss on cash flow hedges	(13)	(151)	(123)	(138)
Reclassification to net income of net realized loss	21	53	161	59
Actuarial loss
Amortization to net income of net actuarial loss	87	32	230	132
Prior service cost
Amortization to net income of net prior service cost	25	40	76	96
Income taxes on pension and other postretirement benefit plans	(13)	(8)	(35)	(28)
Comprehensive income	918	1,622	3,138	5,001
Comprehensive income attributable to noncontrolling interests	14	15	37	52
Comprehensive income attributable to Schlumberger	$ 904	$ 1,607	$ 3,101	$ 4,949