Income Taxes - Expense Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amount
Statutory federal income tax expense	$ 23	$ 15	$ 38
State income taxes, net of federal benefit	18	14	(25)
Change in federal valuation allowance	8	7	7
Nondeductible compensation	4	3	2
Other differences, net	0	(2)	(2)
Total income tax expense (benefit)	$ 53	$ 37	$ 20
Rate
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	16.70%	18.90%	(14.10%)
Change in federal valuation allowance	7.50%	9.90%	3.80%
Nondeductible compensation	3.50%	3.60%	1.30%
Other differences, net	(1.00%)	(1.90%)	(0.60%)
Total income tax rate	47.70%	51.50%	11.40%