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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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