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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)