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Pension and Other Postretirement Benefits - Schedule of Pension Plan Benefit Obligations (Details) - Pension benefits paid - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 6,476 | $ 7,359 | $ 7,026
Accumulated benefit obligation | 6,444 | 7,169 |
The aggregate projected benefit obligation and fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets was as follows: |  |  |
Projected benefit obligation | 5,435 | 6,600 |
Fair value of plan assets | 3,182 | 4,016 |
The aggregate accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets was as follows: |  |  |
Accumulated benefit obligation | 5,415 | 6,422 |
Fair value of plan assets | $ 3,179 | $ 3,998 |

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