Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred:
Federal	$ (44)	$ (247)	$ 119
State	(44)	(82)	20
Deferred income tax (benefit) expense	(88)	(329)	139
Current:
Federal	3	(199)	36
State	5	(9)	19
Foreign	(1)	(2)	5
Current income tax expense (benefit)	7	(210)	60
Total income tax (benefit) expense	$ (81)	$ (539)	$ 199

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