CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 312	$ (7,368)
Currency translation adjustments
Unrealized net change arising during the period	14	(125)
Cash flow hedges
Net gain (loss) on cash flow hedges	150	(203)
Reclassification to net income (loss) of net realized (gain) loss	(2)	1
Pension and other postretirement benefit plans
Amortization to net income (loss) of net actuarial loss	63	51
Amortization to net income (loss) of net prior service credit	(5)	(5)
Income taxes on pension and other postretirement benefit plans		(4)
Comprehensive income (loss)	532	(7,653)
Comprehensive income attributable to noncontrolling interests	13	8
Comprehensive income (loss) attributable to Schlumberger	$ 519	$ (7,661)