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Employee Benefits - Amounts Recognized on Balance Sheet and Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Amounts recognized in the balance sheets |  |
Non-current liabilities | $ (11,997) | $ (13,189)
Pension |  |
Amounts recognized in the balance sheets |  |
Current liabilities | (38) | (42)
Non-current liabilities | (1,078) | (1,555)
Total | (1,116) | (1,597)
Amounts recognized in Accumulated other comprehensive loss (pre-tax) |  |
Prior service cost (benefit) | 523 | 635
Total | 523 | 635
Health Care and Life |  |
Amounts recognized in the balance sheets |  |
Current liabilities | (643) | (685)
Non-current liabilities | (9,430) | (10,304)
Total | (10,073) | (10,989)
Amounts recognized in Accumulated other comprehensive loss (pre-tax) |  |
Prior service cost (benefit) | (833) | (962)
Total | $ (833) | $ (962)

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