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v3.25.2

Pensions and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | May 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Curtailment gain | $ 0 | $ 20 |  | $ 0 | $ 20
Percent reduction in future years of service of plan participants (as a percent) |  |  | 10.00% |  |

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