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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current tax:      
U.S. federal $ (1) $ 6 $ 11
State and foreign 171 147 113
Current tax, total 170 153 124
Deferred tax:      
U.S. federal 19 12 30
State and foreign (3) 13 (111)
Deferred tax, total 16 25 (81)
Total $ 186 $ 178 $ 43