CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 530	$ 284
Currency translation adjustments
Unrealized net change arising during the period	39	45
Marketable securities
Unrealized gain (loss) arising during the period	19	(4)
Cash flow hedges
Net gain on cash flow hedges	5	11
Reclassification to net income of net realized gain	(3)
Pension and other postretirement benefit plans
Amortization to net income of net actuarial loss	56	43
Amortization to net income of net prior service (credit) cost	(1)	20
Income taxes on pension and other postretirement benefit plans		(1)
Comprehensive income	645	398
Comprehensive income attributable to noncontrolling interests	5	5
Comprehensive income attributable to Schlumberger	$ 640	$ 393