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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year $ 12,733 $ 13,641
Net Income 0 4
Reclassification Adjustments (4) 4
Balance at End of Period 12,727 13,461
Accum. Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (351) (402)
Balance at End of Period (355) (394)
Pensions and other postretirement liabilities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (319) (356)
Net Income 0 0
Reclassification Adjustments (4) 4
Balance at End of Period (323) (352)
Other comprehensive loss of equity investees    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (32) (46)
Net Income 0 4
Reclassification Adjustments 0 0
Balance at End of Period $ (32) $ (42)