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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Actual return | $ 22 | $ 29
(Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual return | (8) |
Estimated future employer contributions in next fiscal year | $ 21 |

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