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Pension and Other Postretirement Benefits - Schedule of Pension Plan Benefit Obligations (Details) - Pension benefits - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 1,592 | $ 1,599 | $ 2,296
Accumulated benefit obligation | 1,591 | 1,598 |
The aggregate projected benefit obligation and fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets were as follows: |  |  |
Projected benefit obligation | 1,459 | 1,482 |
Fair value of plan assets | 780 | 833 |
The aggregate accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets were as follows: |  |  |
Accumulated benefit obligation | 1,459 | 1,481 |
Fair value of plan assets | $ 780 | $ 833 |

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