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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year $ 12,781 $ 12,733
Net Income 0 0
Reclassification Adjustments (2) (4)
Balance at End of Period 12,536 12,727
Accum. Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (320) (351)
Balance at End of Period (322) (355)
Pensions and other postretirement liabilities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (292) (319)
Net Income 0 0
Reclassification Adjustments (2) (4)
Balance at End of Period (294) (323)
Other comprehensive loss of equity investees    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (28) (32)
Net Income 0 0
Reclassification Adjustments 0 0
Balance at End of Period $ (28) $ (32)