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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 2,177	$ (1,513)	$ (1,627)
Currency translation adjustments
Net change arising during the period	(191)	(3)	(83)
Marketable securities
Unrealized gain (loss) arising during the period	(11)	(8)	21
Cash flow hedges
Net gain (loss) on cash flow hedges	(16)	22	(101)
Reclassification to net income (loss) of net realized loss	1		121
Pension and other postretirement benefit plans
Actuarial gain (loss) arising during the period	(186)	134	(289)
Amortization to net income (loss) of net actuarial loss	187	159	157
Amortization to net income (loss) of net prior service cost	(5)	80	102
Income taxes on pension and other postretirement benefit plans	(18)	(15)	(13)
Comprehensive income (loss)	1,938	(1,144)	(1,712)
Comprehensive income (loss) attributable to noncontrolling interests	39	(8)	60
Comprehensive income (loss) attributable to Schlumberger	$ 1,899	$ (1,136)	$ (1,772)

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