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Retirement Plans and Other Retiree Benefits - Benefit Obligation Exceeds Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 2,251 | $ 2,352
Fair value of plan assets | 1,486 | 1,532
Accumulated benefit obligation | 2,075 | 2,204
Fair value of plan assets | 1,345 | 1,428
Other Retiree Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | 0 | 0
Fair value of plan assets | $ 0 | $ 0

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