CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (10,107)	$ 2,177	$ (1,513)
Currency translation adjustments
Net change arising during the period	67	(191)	(3)
Marketable securities
Unrealized loss arising during the period		(11)	(8)
Cash flow hedges
Net gain (loss) on cash flow hedges	(32)	(16)	22
Reclassification to net income (loss) of net realized loss	10	1
Pension and other postretirement benefit plans
Actuarial gain (loss) arising during the period	127	(186)	134
Amortization to net income (loss) of net actuarial loss	94	187	159
Amortization to net income (loss) of net prior service (credit) cost	(11)	(5)	80
Income taxes on pension and other postretirement benefit plans	(71)	(18)	(15)
Comprehensive income (loss)	(9,923)	1,938	(1,144)
Comprehensive income (loss) attributable to noncontrolling interests	30	39	(8)
Comprehensive income (loss) attributable to Schlumberger	$ (9,953)	$ 1,899	$ (1,136)