v3.26.3
Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 15,547 $ 14,306
Net Income 0 0
Reclassification Adjustments (3) 0
Ending balance 16,730 15,141
Accum. Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (210) (262)
Ending balance (213) (262)
Pensions and other postretirement liabilities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (192) (240)
Net Income 0 0
Reclassification Adjustments (3) 0
Ending balance (195) (240)
Other comprehensive income (loss) of equity investees    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (18) (22)
Net Income 0 0
Reclassification Adjustments 0 0
Ending balance $ (18) $ (22)