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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year $ 12,733 $ 13,641
Net Income 0 11
Reclassification Adjustments (13) 14
Balance at End of Period 12,615 13,024
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 (364) (377)
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 (13) 14
Balance at End of Period (332) (342)
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 11
Reclassification Adjustments 0 0
Balance at End of Period $ (32) $ (35)