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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year $ 15,184 $ 15,362
Net Income (Loss) 6 (1)
Reclassification Adjustments 14 11
Balance at End of Period 14,941 15,238
Accum. Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (491) (563)
Balance at End of Period (471) (553)
Pensions and other postretirment liabilities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (421) (497)
Net Income (Loss) 0 0
Reclassification Adjustments 14 11
Balance at End of Period (407) (486)
Other comprehensive loss of equity investees    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (70) (66)
Net Income (Loss) 6 (1)
Reclassification Adjustments 0 0
Balance at End of Period $ (64) $ (67)