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Income Taxes - Expense Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income tax expense reconciliation
Statutory federal income tax expense	$ 26	$ 47	$ 60
State income taxes, net of federal benefit	16	(23)	11
Change in federal valuation allowance	7	7	0
Loss carryback benefit of CARES Act	0	0	(60)
Nondeductible compensation	7	6	9
Tax credits	(2)	(2)	(2)
Other differences, net	(1)	(2)	1
Total income tax expense (benefit)	$ 53	$ 33	$ 19
Income tax rate reconciliation
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	12.80%	(10.30%)	4.00%
Change in federal valuation allowance	5.70%	3.10%	0.00%
Loss carryback benefit of CARES Act	0.00%	0.00%	(21.00%)
Nondeductible compensation	5.60%	2.90%	3.00%
Tax credits	(1.90%)	(0.80%)	(0.60%)
Other differences, net	(0.60%)	(0.80%)	0.00%
Total income tax rate	42.60%	15.10%	6.40%

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