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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net income | $ 4,156 | $ 2,417 | $ 4,101
Other comprehensive income (loss): |  |  |
Foreign currency translation adjustment | 514 | (415) | (606)
Net gain (loss) on pension and other postretirement benefits | (65) | (98) | 57
Other comprehensive income (loss) before income tax expense (benefit) | 449 | (513) | (549)
Income tax expense (benefit) related to items of other comprehensive income (loss) | (21) | (37) | 17
Other comprehensive income (loss) | 470 | (476) | (566)
Comprehensive income | 4,626 | 1,941 | 3,535
Less: Comprehensive income attributable to noncontrolling interests | 91 | 129 | 111
Comprehensive income attributable to Valero Energy Corporation stockholders | $ 4,535 | $ 1,812 | $ 3,424

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