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Pensions and Other Postretirement Benefits (Additional Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Benefit pension plan, decrease for remeasurement due to Settlement |  | $ 309 |
Pension |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net periodic benefit cost | $ 7 | 199 |
Other Postretirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net periodic benefit cost | 5 | 6 |
Mandatory Contribution |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contributions to defined benefit pension plans | $ 1 | $ 1 |
Scenario, Forecast | Pension |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net periodic benefit cost |  |  | $ 26
Scenario, Forecast | Other Postretirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net periodic benefit cost |  |  | $ 22

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