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Stockholders' Equity Tax Benefit (Expense) on Net Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax $ (133) $ 275 $ 165
Pension Plan      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax 54 231 199
Other Benefit Plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax (211) 52 (40)
Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other Comprehensive Income (Loss), Tax $ 24 $ (8) $ 6