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Income Taxes - Expense Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amount
Statutory federal income tax expense	$ 38	$ 52	$ 39
State income taxes, net of federal benefit	(25)	8	6
Change in federal valuation allowance	7	0	7
Loss carryback benefit of CARES Act	0	(49)	0
Nondeductible compensation	2	6	2
Tax credits	0	0	(3)
Other differences, net	(2)	0	1
Total income tax expense (benefit)	$ 20	$ 17	$ 52
Rate
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	(14.10%)	3.40%	3.40%
Change in federal valuation allowance	3.80%	0.10%	3.60%
Loss carryback benefit of CARES Act rate	0.00%	(19.80%)	0.00%
Nondeductible compensation	1.30%	2.60%	1.30%
Tax credits	(0.20%)	(0.10%)	(1.50%)
Other differences, net	(0.40%)	(0.60%)	0.30%
Total income tax rate	11.40%	6.60%	28.10%

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