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Pensions and Other Postretirement Benefits - Narrative (Details) $ in Millions | 3 Months Ended | 5 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 USD ($) | May 31, 2024 USD ($) employee | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
Employee Severance |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of management employees separated from service | employee |  | 350 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain |  | $ 0 | $ 0 | $ 0
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Curtailment gain | $ 20 |  | $ 0 | $ 20
Percent reduction in future years of service of plan participants (as a percent) |  | 10.00% |  |

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