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Benefit Plans - Cash flows (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2024
Pension benefits |  |  |
Components of net periodic cost |  |  |
Discretionary contribution to qualified pension plan | $ 35,000,000 |  |
Defined benefit pension plans, estimated employer contributions in next fiscal year |  | $ 14,000,000 |
Employer contribution |  | 44,000,000 | $ 45,000,000
Postretirement benefits |  |  |
Components of net periodic cost |  |  |
Defined benefit pension plans, estimated employer contributions in next fiscal year |  | 0 |
Employer contribution |  | 21,000,000 | 24,000,000
Participant contributions |  | $ 11,000,000 | $ 13,000,000

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