CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (11,373)	$ 658	$ (10,450)	$ 1,628
Currency translation adjustments
Unrealized net change arising during the period	(21)	(47)	18	(128)
Marketable securities
Unrealized loss arising during the period		(12)		(33)
Cash flow hedges
Net gain (loss) on cash flow hedges	(27)	4	(31)	(6)
Reclassification to net income (loss) of net realized (gain) loss	3	2	7	(2)
Pension and other postretirement benefit plans
Amortization to net income (loss) of net actuarial loss	23	47	70	141
Amortization to net income (loss) of net prior service credit	(2)	(1)	(8)	(4)
Income taxes on pension and other postretirement benefit plans	(1)	(2)	(3)	(7)
Comprehensive income (loss)	(11,398)	649	(10,397)	1,589
Comprehensive income attributable to noncontrolling interests	10	14	20	29
Comprehensive income (loss) attributable to Schlumberger	$ (11,408)	$ 635	$ (10,417)	$ 1,560