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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net Income (Loss) | $ 9,269 | $ (431) | $ 4,710
Currency translation adjustment |  |  |
Unrealized net change arising during period | 57 | (22) | (44)
Unrealized holding (loss) gain on securities |  |  |
Net (loss) gain arising during period | (3) | 27 | (21)
Actuarial gain (loss) |  |  |
Amortization to net income of net actuarial loss and settlements | 817 | 918 | 794
Actuarial (loss) gain arising during period | (571) | (315) | 109
Prior service credits (cost) |  |  |
Amortization to net income of net prior service costs and curtailments | (20) | 19 | 30
Prior service (costs) credits arising during period | (1) | 345 | 6
Defined benefit plans sponsored by equity affiliates - benefit (cost) | 19 | (19) | 30
Income taxes on defined benefit plans | (44) | (505) | (336)
Total | 200 | 443 | 633
Other Comprehensive Gain, Net of Tax | 254 | 448 | 568
Comprehensive Income | 9,523 | 17 | 5,278
Comprehensive income attributable to noncontrolling interests | (74) | (66) | (123)
Comprehensive Income (Loss) Attributable to Chevron Corporation | $ 9,449 | $ (49) | $ 5,155

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