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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 14,306 $ 12,781
Net Income 1 (6)
Reclassification Adjustments 0 (4)
Ending balance 14,787 12,979
Accum. Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (262) (320)
Ending balance (261) (330)
Pensions and other postretirement liabilities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (240) (292)
Net Income 0 (7)
Reclassification Adjustments 0 (4)
Ending balance (240) (303)
Other comprehensive income (loss) of equity investees    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (22) (28)
Net Income 1 1
Reclassification Adjustments 0 0
Ending balance $ (21) $ (27)