CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 441	$ (81)	$ 971	$ 203
Currency translation adjustments
Unrealized net change arising during the period	(121)	(71)	(81)	(26)
Marketable securities
Unrealized loss arising during the period	(40)	(21)	(21)	(25)
Cash flow hedges
Net gain (loss) on cash flow hedges	(15)		(10)	11
Reclassification to net income (loss) of net realized (gain) loss	(1)	8	(5)	8
Pension and other postretirement benefit plans
Amortization to net income of net actuarial loss	37	36	94	79
Amortization to net income of net prior service (credit) cost	(1)	20	(3)	40
Income taxes on pension and other postretirement benefit plans	(5)	(1)	(5)	(2)
Comprehensive income (loss)	295	(110)	940	288
Comprehensive income (loss) attributable to noncontrolling interests	11	(7)	16	(2)
Comprehensive income (loss) attributable to Schlumberger	$ 284	$ (103)	$ 924	$ 290