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Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred:      
Federal $ (247) $ 119 $ 82
State (82) 20 7
Foreign 0 0 1
Deferred income tax (benefit) expense (329) 139 90
Current:      
Federal (199) 36 (61)
State (9) 19 (5)
Foreign (2) 5 6
Current income tax (benefit) expense (210) 60 (60)
Total income tax (benefit) expense $ (539) $ 199 $ 30