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Postretirement Plans - Schedule of Key Information for All Plans with ABO in Excess of Plan Assets (Details) - Pension - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 44,470 | $ 47,665
Fair value of plan assets | 38,866 | 41,666
Projected benefit obligation | $ 45,002 | $ 48,320

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