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Pension and Other Postretirement Benefits - Schedule of Pension Plan Benefit Obligations (Details) - Pension benefits paid - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 2,713 | $ 7,249 | $ 6,476
Accumulated benefit obligation | 2,707 | 7,219 |
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 | 2,364 | 6,064 |
Fair value of plan assets | 1,364 | 3,579 |
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 | $ 2,359 | 6,045 |
Fair value of plan assets |  | $ 3,579 |

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