CONSOLIDATED STATEMENT OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (73)	$ (11,373)	$ (10,868)	$ (10,450)
Currency translation adjustments
Unrealized net change arising during the period	(94)	(21)	(200)	18
Cash flow hedges
Net gain (loss) on cash flow hedges	36	(27)	(195)	(31)
Reclassification to net income of net realized loss	7	3	12	7
Pension and other postretirement benefit plans
Amortization to net loss of net actuarial loss	48	23	150	70
Amortization to net loss of net prior service credit	(2)	(2)	(13)	(8)
Impact of curtailment			(69)
Income taxes on pension and other postretirement benefit plans		(1)	10	(3)
Comprehensive loss	(78)	(11,398)	(11,173)	(10,397)
Comprehensive income attributable to noncontrolling interests	9	10	24	20
Comprehensive loss attributable to Schlumberger	$ (87)	$ (11,408)	$ (11,197)	$ (10,417)