Income Taxes - Expense Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amount
Statutory federal income tax expense	$ (5)	$ 23	$ 15
State income taxes, net of federal benefit	4	18	14
Change in federal valuation allowance	9	8	7
Nondeductible compensation	2	4	3
Other differences, net	0	0	(2)
Total income tax expense (benefit)	$ 10	$ 53	$ 37
Rate
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	(19.80%)	16.70%	18.90%
Change in federal valuation allowance	(41.50%)	7.50%	9.90%
Nondeductible compensation	(7.40%)	3.50%	3.60%
Other differences, net	4.60%	(1.00%)	(1.90%)
Total income tax rate	(43.10%)	47.70%	51.50%