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Employee Benefits - Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Retirement Benefits [Abstract] |  |
Accumulated benefit obligation | $ 7,881 | $ 15,086
Fair value of plan assets | 6,802 | 13,534
Projected benefit obligation | 7,918 | 15,133
Fair value of plan assets | $ 6,802 | $ 13,536

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