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Income Taxes Schedule of Components of Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 4 $ 10 $ 4
State and local 12 3 1
Current Income Tax Expense (Benefit) 16 13 5
Deferred:      
Federal 61 23 26
State and local 9 14 14
deferred income tax expense 70 37 40
Income tax expense $ 86 $ 50 $ 45