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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year $ 12,781 $ 12,733
Net Income (6) 0
Reclassification Adjustments (4) (8)
Balance at End of Period 12,979 12,640
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 (330) (359)
Pensions and other postretirement liabilities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (292) (319)
Net Income (7) 0
Reclassification Adjustments (4) (8)
Balance at End of Period (303) (327)
Other comprehensive income (loss) of equity investees    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at Beginning of Year (28) (32)
Net Income 1 0
Reclassification Adjustments 0 0
Balance at End of Period $ (27) $ (32)