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Stockholders' Equity - Other Comprehensive Income (Loss) Of Equity Investees (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pretax Amount      
  Pensions and other postretirement benefits $ 161 $ (123)  
Other comprehensive income (loss), before tax 250 (138) $ 97
Tax (Expense) Benefit      
Other comprehensive income (loss) (58) 35 (25)
Net-of-Tax Amount      
Reclassification Adjustments 31 20  
Other comprehensive income (loss), net of tax 192 (103) 72
Pensions And Other Postretirement Liabilities      
Pretax Amount      
  Pensions and other postretirement benefits 185 (167) 81
Reclassification adjustments for costs 41 27 20
Other comprehensive income (loss), before tax 226 (140) 101
Tax (Expense) Benefit      
  Pensions and other postretirement benefits (46) 42 (20)
Reclassification from AOCI, Current Period, Tax (10) (7) (5)
Other comprehensive income (loss) (56) 35 (25)
Net-of-Tax Amount      
  Pensions and other postretirement benefits 139 (125) 61
Reclassification Adjustments 31 20 15
Other comprehensive income (loss), net of tax 170 (105) 76
Other comprehensive income of equity investees      
Pretax Amount      
  Pensions and other postretirement benefits 22 2  
Other comprehensive income (loss), before tax 24 2 (4)
Tax (Expense) Benefit      
Other comprehensive income (loss) (2) 0 0
Net-of-Tax Amount      
Reclassification Adjustments 0 0  
Other comprehensive income (loss), net of tax $ 22 $ 2 $ (4)