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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year $ 13,641 $ 14,791
Net Income 6 0
Reclassification Adjustments 8 16
Balance at End of Period 13,154 14,317
Accum. Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (402) (594)
Balance at End of Period (388) (578)
Pensions and other postretirement liabilities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (356) (526)
Net Income 0 0
Reclassification Adjustments 8 16
Balance at End of Period (348) (510)
Other comprehensive income (loss) of equity investees    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (46) (68)
Net Income 6 0
Reclassification Adjustments 0 0
Balance at End of Period $ (40) $ (68)