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Income Taxes - Expense Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax expense reconciliation      
Statutory federal income tax expense $ 46 $ (43) $ 32
State income taxes, net of federal benefit 11 6 2
Effect of noncontrolling interests (1) (2) (1)
Federal income tax rate change (16) (314) 0
Change in federal valuation allowance (1) (5) 2
Goodwill impairment 0 71 0
Nondeductible compensation 9 10 3
Other differences, net (2) (2) 2
Total income tax expense (benefit) $ 46 $ (279) $ 40
Income tax rate reconciliation      
Statutory federal income tax rate 21.00% 35.00% 35.00%
State income taxes, net of federal benefit 4.90% (5.20%) 2.50%
Effect of noncontrolling interests (0.40%) 1.70% (0.80%)
Federal income tax rate change (7.10%) 257.50% 0.00%
Change in federal valuation allowance (0.30%) 4.30% 2.60%
Goodwill impairment 0.00% (58.20%) 0.00%
Nondeductible compensation 4.10% (8.10%) 2.70%
Other differences, net (1.20%) 2.10% 1.20%
Total income tax rate 21.00% 229.10% 43.20%