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Stockholders' Equity - Other Comprehensive Income (Loss) Of Equity Investees (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pretax Amount      
  Pensions and other postretirement benefits $ 34 $ 161  
Other comprehensive income (loss), before tax 68 250 $ (138)
Tax (Expense) Benefit      
Other comprehensive income (loss) (17) (58) 35
Net-of-Tax Amount      
Reclassification Adjustments 17 31  
Other comprehensive income (loss), net of tax 51 192 (103)
Pensions And Other Postretirement Liabilities      
Pretax Amount      
  Pensions and other postretirement benefits 27 185 (167)
Reclassification adjustments for costs included in net income 24 41 27
Other comprehensive income (loss), before tax 51 226 (140)
Tax (Expense) Benefit      
  Pensions and other postretirement benefits (7) (46) 42
Reclassification adjustments for costs included in net income (7) (10) (7)
Other comprehensive income (loss) (14) (56) 35
Net-of-Tax Amount      
  Pensions and other postretirement benefits 20 139 (125)
Reclassification Adjustments 17 31 20
Other comprehensive income (loss), net of tax 37 170 (105)
Other comprehensive income of equity investees      
Pretax Amount      
  Pensions and other postretirement benefits 14 22  
Other comprehensive income (loss), before tax 17 24 2
Tax (Expense) Benefit      
Other comprehensive income (loss) (3) (2) 0
Net-of-Tax Amount      
Reclassification Adjustments 0 0  
Other comprehensive income (loss), net of tax $ 14 $ 22 $ 2