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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year $ 12,733 $ 13,641 $ 14,791
Net Income 48 34  
Reclassification Adjustments (17) 17  
Balance at End of Year 12,781 12,733 13,641
Pensions and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (319) (356)  
Net Income 44 20  
Reclassification Adjustments (17) 17  
Balance at End of Year (292) (319) (356)
Other comprehensive income of equity investees      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (32) (46)  
Net Income 4 14  
Reclassification Adjustments 0 0  
Balance at End of Year (28) (32) (46)
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (351) (402) (594)
Balance at End of Year $ (320) $ (351) $ (402)