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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net income (loss) | $ (10,486) | $ (10,107) | $ 2,177
Currency translation adjustments |  |  |
Net change arising during the period | (239) | 67 | (191)
Marketable securities |  |  |
Unrealized loss arising during the period |  |  | (11)
Cash flow hedges |  |  |
Net loss on cash flow hedges | (90) | (32) | (16)
Reclassification to net income (loss) of net realized loss | 54 | 10 | 1
Pension and other postretirement benefit plans |  |  |
Actuarial gain (loss) arising during the period | (247) | 127 | (186)
Amortization to net income (loss) of net actuarial loss | 200 | 94 | 187
Amortization to net income (loss) of net prior service (credit) cost | (17) | (11) | (5)
Impact of curtailment | (69) |  |
Income taxes on pension and other postretirement benefit plans | (38) | (71) | (18)
Comprehensive income (loss) | (10,932) | (9,923) | 1,938
Comprehensive income attributable to noncontrolling interests | 32 | 30 | 39
Comprehensive income (loss) attributable to Schlumberger | $ (10,964) | $ (9,953) | $ 1,899

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