CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 430	$ 530
Currency translation adjustments
Unrealized net change arising during the period	77	39
Marketable securities
Unrealized gain arising during the period		19
Cash flow hedges
Net gain (loss) on cash flow hedges	(5)	5
Reclassification to net income of net realized (gain) loss	2	(3)
Pension and other postretirement benefit plans
Amortization to net income of net actuarial loss	24	56
Amortization to net income of net prior service credit	(3)	(1)
Comprehensive income	525	645
Comprehensive income attributable to noncontrolling interests	9	5
Comprehensive income attributable to Schlumberger	$ 516	$ 640