v3.26.1
Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ 15,547 $ 14,306
Net Income 0 1
Reclassification Adjustments (1) 0
Ending balance 15,804 14,511
Accum. Other Comprehensive Loss    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (210) (262)
Ending balance (211) (261)
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 (1) 0
Ending balance (193) (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 1
Reclassification Adjustments 0 0
Ending balance $ (18) $ (21)