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Stockholders' Equity - Other Comprehensive Income (Loss) Of Equity Investees (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pretax Amount      
  Pensions and other postretirement benefits $ (123) $ 57  
Other comprehensive income (loss) (138) 97 $ (157)
Tax (Expense) Benefit      
Other comprehensive income (loss) 35 (25) 38
Net-of-Tax Amount      
Reclassification Adjustments 20 15  
Other comprehensive income (loss) (103) 72 (119)
Pensions And Other Postretirement Liabilities      
Pretax Amount      
  Pensions and other postretirement benefits (167) 81 (181)
Reclassification adjustments for costs 27 20 33
Other comprehensive income (loss) (140) 101 (148)
Tax (Expense) Benefit      
  Pensions and other postretirement benefits 42 (20) 45
Reclassification from AOCI, Current Period, Tax (7) (5) (8)
Other comprehensive income (loss) 35 (25) 37
Net-of-Tax Amount      
  Pensions and other postretirement benefits (125) 61 (136)
Reclassification Adjustments 20 15 25
Other comprehensive income (loss) (105) 76 (111)
Other comprehensive income of equity investees      
Pretax Amount      
  Pensions and other postretirement benefits 2 (4)  
Other comprehensive income (loss) 2 (4) (9)
Tax (Expense) Benefit      
Other comprehensive income (loss) 0 0 1
Net-of-Tax Amount      
Reclassification Adjustments 0 0  
Other comprehensive income (loss) $ 2 $ (4) $ (8)