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Income Taxes - Reconciliation of Total Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Tax computed at federal statutory rate $ 105 $ 0 $ (4)
State income taxes, net of federal tax benefit 14 (16) (8)
State tax incentives, net of federal tax expense (4) (7) (9)
Noncontrolling interest (26) 6 6
Other, net 0 0 (5)
Adjustment to deferred tax assets and liabilities for enacted change in federal tax rate (a) 0 (200) 0
Total income tax expense (benefit) $ 89 $ (217) $ (20)