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Income Taxes - Reconciliation of Total Income Tax (Benefit) Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax computed at federal statutory rate	$ (87)	$ 103	$ 94
State income taxes, net of federal tax benefit	(18)	29	12
State tax incentives, net of federal tax expense	(7)	(4)	(4)
Noncontrolling interest	13	4	(23)
Goodwill impairment	3	0	0
Other, net	1	(3)	0
Total income tax (benefit) expense	$ (95)	$ 129	$ 79

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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