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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
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Amounts recognized in the balance sheets |  |
Non-current liabilities | $ (13,189) | $ (12,974)
Pension |  |
Amounts recognized in the balance sheets |  |
Non-current assets | 0 | 4
Current liabilities | (42) | (48)
Non-current liabilities | (1,555) | (1,586)
Total | (1,597) | (1,630)
Amounts recognized in Accumulated other comprehensive loss (pre-tax) |  |
Prior service cost (benefit) | 635 | 747
Total | 635 | 747
Health Care and Life |  |
Amounts recognized in the balance sheets |  |
Non-current assets | 0 | 0
Current liabilities | (685) | (718)
Non-current liabilities | (10,304) | (9,939)
Total | (10,989) | (10,657)
Amounts recognized in Accumulated other comprehensive loss (pre-tax) |  |
Prior service cost (benefit) | (962) | (1,355)
Total | $ (962) | $ (1,355)

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