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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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