CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (3,428)	$ 494	$ (10,796)	$ 923
Currency translation adjustments
Unrealized net change arising during the period	19	(37)	(106)	39
Cash flow hedges
Net (loss) gain on cash flow hedges	(28)	1	(231)	(4)
Reclassification to net income (loss) of net realized loss	4	1	5	4
Pension and other postretirement benefit plans
Amortization to net income (loss) of net actuarial loss	37	23	88	47
Amortization to net income (loss) of net prior service credit	8	(3)	3	(6)
Impact of curtailment	(69)		(69)
Income taxes on pension and other postretirement benefit plans	14	(2)	10	(2)
Comprehensive income (loss)	(3,443)	477	(11,096)	1,001
Comprehensive income attributable to noncontrolling interests	6	2	14	10
Comprehensive income (loss) attributable to Schlumberger	$ (3,449)	$ 475	$ (11,110)	$ 991