CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (1,513)	$ (1,627)	$ 2,135
Currency translation adjustments
Unrealized net change arising during the period	(3)	(83)	(522)
Marketable securities
Unrealized gain (loss) arising during the period	(8)	21	(50)
Reclassification to net income - impairment charge			40
Cash flow hedges
Net gain (loss) on cash flow hedges	22	(101)	(178)
Reclassification to net income (loss) of net realized loss		121	235
Actuarial gain (loss)
Actuarial gain (loss) arising during the period	134	(289)	(210)
Amortization to net income (loss) of net actuarial loss	159	157	306
Prior service cost
Amortization to net income (loss) of net prior service cost	80	102	101
Income taxes on pension and other postretirement benefit plans	(15)	(13)	(74)
Comprehensive income (loss)	(1,144)	(1,712)	1,783
Comprehensive income (loss) attributable to noncontrolling interests	(8)	60	63
Comprehensive income (loss) attributable to Schlumberger	$ (1,136)	$ (1,772)	$ 1,720