CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 1,134	$ 1,616	$ 2,122	$ 3,224
Currency translation adjustments
Unrealized net change arising during the period	19	58	(94)	(30)
Marketable securities
Unrealized gain (loss) arising during the period	8	19	(10)	30
Cash flow hedges
Net gain (loss) on cash flow hedges	42	(3)	(110)	13
Reclassification to net income of net realized loss	22	9	140	6
Actuarial loss
Amortization to net income of net actuarial loss	69	59	143	100
Prior service cost
Amortization to net income of net prior service cost	24	24	51	56
Income taxes on pension and other postretirement benefit plans	(7)	(10)	(22)	(20)
Comprehensive income	1,311	1,772	2,220	3,379
Comprehensive income attributable to noncontrolling interests	10	21	23	37
Comprehensive income attributable to Schlumberger	$ 1,301	$ 1,751	$ 2,197	$ 3,342