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Retirement Plans and Other Retiree Benefits - Benefit Obligation Exceeds Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation | $ 2,352 | $ 657
Fair value of plan assets | 1,532 | 108
Accumulated benefit obligation | 2,204 | 540
Fair value of plan assets | 1,428 | 20
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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