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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year $ 12,781 $ 12,733 $ 13,641
Net Income 80 48  
Reclassification Adjustments (22) (17)  
Balance at End of Year 14,306 12,781 12,733
Pensions and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (292) (319)  
Net Income 74 44  
Reclassification Adjustments (22) (17)  
Balance at End of Year (240) (292) (319)
Other comprehensive income of equity investees      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (28) (32)  
Net Income 6 4  
Reclassification Adjustments 0 0  
Balance at End of Year (22) (28) (32)
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (320) (351) (402)
Balance at End of Year $ (262) $ (320) $ (351)