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Stockholders' Equity - Other Comprehensive Income (Loss) Of Equity Investees (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pretax Amount      
  Pensions and other postretirement benefits $ 48 $ 34  
Other comprehensive income, before tax 40 68 $ 250
Tax (Expense) Benefit      
Other comprehensive income (loss) (9) (17) (58)
Net-of-Tax Amount      
Reclassification Adjustments (17) 17  
Other comprehensive income, net of tax 31 51 192
Pensions And Other Postretirement Liabilities      
Pretax Amount      
  Pensions and other postretirement benefits 59 27 185
Reclassification adjustments for costs included in net income (23) 24 41
Other comprehensive income, before tax 36 51 226
Tax (Expense) Benefit      
  Pensions and other postretirement benefits (15) (7) (46)
Reclassification adjustments for costs included in net income 6 (7) (10)
Other comprehensive income (loss) (9) (14) (56)
Net-of-Tax Amount      
  Pensions and other postretirement benefits 44 20 139
Reclassification Adjustments (17) 17 31
Other comprehensive income, net of tax 27 37 170
Other comprehensive income of equity investees      
Pretax Amount      
  Pensions and other postretirement benefits 4 14  
Other comprehensive income, before tax 4 17 24
Tax (Expense) Benefit      
Other comprehensive income (loss) 0 (3) (2)
Net-of-Tax Amount      
Reclassification Adjustments 0 0  
Other comprehensive income, net of tax $ 4 $ 14 $ 22