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Income Taxes - Expense Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income tax expense reconciliation
Statutory federal income tax expense	$ 47	$ 60	$ 44
State income taxes, net of federal benefit	(23)	11	12
Change in federal valuation allowance	7	0	7
Loss carryback benefit of CARES Act	0	(60)	0
Nondeductible compensation	6	9	4
Tax credits	(2)	(2)	(4)
Other differences, net	(2)	1	1
Total income tax expense (benefit)	$ 33	$ 19	$ 64
Income tax rate reconciliation
Statutory federal income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal benefit	(10.30%)	4.00%	5.50%
Change in federal valuation allowance	3.10%	0.00%	3.10%
Loss carryback benefit of CARES Act	0.00%	(21.00%)	0.00%
Nondeductible compensation	2.90%	3.00%	1.90%
Tax credits	(0.80%)	(0.60%)	(1.90%)
Other differences, net	(0.80%)	0.00%	0.70%
Total income tax rate	15.10%	6.40%	30.30%

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