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Stockholders' Equity Tax Benefit (Expense) on Net Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) $ 1 $ (1) $ 27 $ (2)
Derivative Instruments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) 1 1 (6) 2
Pension Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) 0 (2) 4 (4)
Other Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Tax Benefit (Expense) $ 0 $ 0 $ 29 $ 0