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Employee Benefit Plans - Summary of Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Cumulative gross unrecognized net actuarial loss | $ (3,964) | $ (4,348)
Related tax impact | 952 | 1,092
Total included in accumulated other comprehensive loss | $ (3,012) | $ (3,256)

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