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Stockholders' Equity Tax Benefit (Expense) on Net Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) $ 38 $ (2) $ 67 $ (1)
Pension Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) (3) 1 (5) (3)
Other Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) 48 0 97 0
Derivative Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) $ (7) $ (3) $ (25) $ 2