Income Taxes - Expense Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amount
Statutory federal income tax expense	$ 15	$ 38	$ 52
State income taxes, net of federal benefit	14	(25)	8
Change in federal valuation allowance	7	7	0
Loss carryback benefit of CARES Act	0	0	(49)
Nondeductible compensation	3	2	6
Tax credits	0	0	0
Other differences, net	(2)	(2)	0
Total income tax expense (benefit)	$ 37	$ 20	$ 17
Rate
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	18.90%	(14.10%)	3.40%
Change in federal valuation allowance	9.90%	3.80%	0.10%
Loss carryback benefit of CARES Act rate	0.00%	0.00%	(19.80%)
Nondeductible compensation	3.60%	1.30%	2.60%
Tax credits	(0.60%)	(0.20%)	(0.10%)
Other differences, net	(1.30%)	(0.40%)	(0.60%)
Total income tax rate	51.50%	11.40%	6.60%