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Income Taxes - Expense Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amount |  |  |
Statutory federal income tax expense | $ 39 | $ 45 | $ (95)
State income taxes, net of federal benefit | 6 | 9 | (4)
Effect of noncontrolling interests | (1) | (1) | (2)
Federal income tax rate change | 0 | (4) | (254)
Change in federal valuation allowance | 7 | (1) | (5)
Goodwill impairment | 0 | 0 | 71
Nondeductible compensation | 2 | 4 | 4
Tax credits | (3) | 0 | 0
Other differences, net | 2 | (1) | (2)
Total income tax expense (benefit) | $ 52 | $ 51 | $ (287)
Rate |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 35.00%
State income taxes, net of federal benefit | 3.40% | 4.00% | 1.40%
Effect of noncontrolling interests | (0.50%) | (0.40%) | 0.80%
Federal income tax rate change | 0.00% | (2.00%) | 93.30%
Change in federal valuation allowance | 3.60% | (0.30%) | 1.90%
Goodwill impairment | 0.00% | 0.00% | (26.20%)
Nondeductible compensation | 1.30% | 1.80% | (1.50%)
Tax credits | (1.50%) | (0.10%) | 0.10%
Other differences, net | 0.80% | (0.30%) | 0.70%
Total income tax rate | 28.10% | 23.70% | 105.50%

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