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Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year $ 13,641 $ 14,791 $ 15,184
Net Income 34 161  
Reclassification Adjustments 17 31  
Balance at End of Year 12,733 13,641 14,791
Pensions and other postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (356) (526)  
Net Income 20 139  
Reclassification Adjustments 17 31  
Balance at End of Year (319) (356) (526)
Other comprehensive income of equity investees      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (46) (68)  
Net Income 14 22  
Reclassification Adjustments 0 0  
Balance at End of Year (32) (46) (68)
Accumulated other comprehensive loss      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance at Beginning of Year (402) (594) (491)
Balance at End of Year $ (351) $ (402) $ (594)