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Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Defined Benefit Plans | $ 17 | $ 26 | $ 155 | $ 116
Tax expense of defined benefit plans | $ 6 | $ 14 | $ 43 | $ 61

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