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Stockholders' Equity - Other Comprehensive Income (Loss) Of Equity Investees (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pretax Amount      
  Pensions and other postretirement benefits $ 80 $ 48  
Other comprehensive income, before tax 77 40 $ 68
Tax (Expense) Benefit      
Other comprehensive income (loss) (19) (9) (17)
Net-of-Tax Amount      
Reclassification Adjustments (22) (17)  
Other comprehensive income, net of tax 58 31 51
Pensions And Other Postretirement Liabilities      
Pretax Amount      
  Pensions and other postretirement benefits 98 59 27
Reclassification adjustments for costs included in net income (28) (23) 24
Other comprehensive income, before tax 70 36 51
Tax (Expense) Benefit      
  Pensions and other postretirement benefits (24) (15) (7)
Reclassification adjustments for costs included in net income 6 6 (7)
Other comprehensive income (loss) (18) (9) (14)
Net-of-Tax Amount      
  Pensions and other postretirement benefits 74 44 20
Reclassification Adjustments (22) (17) 17
Other comprehensive income, net of tax 52 27 37
Other comprehensive income of equity investees      
Pretax Amount      
  Pensions and other postretirement benefits 6 4  
Other comprehensive income, before tax 7 4 17
Tax (Expense) Benefit      
Other comprehensive income (loss) (1) 0 (3)
Net-of-Tax Amount      
Reclassification Adjustments 0 0  
Other comprehensive income, net of tax $ 6 $ 4 $ 14