CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 556	$ 190	$ 758	$ (1,432)
Currency translation adjustments
Unrealized net change arising during the period	75	27	49	(26)
Marketable securities
Unrealized loss arising during the period	(41)	(5)	(66)	(2)
Cash flow hedges
Net gain (loss) on cash flow hedges	8	(18)	19	(86)
Reclassification to net income (loss) of net realized loss (gain)	(4)	29	4	109
Actuarial loss
Amortization to net income (loss) of net actuarial loss	40	40	119	119
Prior service cost
Amortization to net income (loss) of net prior service cost	20	25	60	76
Income taxes on pension and other postretirement benefit plans		(6)	(2)	(20)
Comprehensive income (loss)	654	282	941	(1,262)
Comprehensive income attributable to noncontrolling interests	11	14	9	50
Comprehensive income (loss) attributable to Schlumberger	$ 643	$ 268	$ 932	$ (1,312)