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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current tax:      
U.S. federal $ 0 $ (1) $ 6
State and foreign 154 171 147
Current tax, total 154 170 153
Deferred tax:      
U.S. federal 217 19 12
State and foreign 30 (3) 13
Deferred tax, total 247 16 25
Total $ 401 $ 186 $ 178