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Income Taxes (Schedule of Provision for Income Taxes for Income from Continuing Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
Federal $ 7 $ (29) $ 27
State 7 3 6
Total, Current 14 (26) 33
Deferred:      
Federal 103 106 60
State (1) 2 11
Total, Deferred 102 108 71
Total provision for income taxes for income from continuing operations $ 116 $ 82 $ 104