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Income Taxes (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current tax:      
U.S. federal $ (2) $ 0 $ (1)
State and foreign 183 154 171
Current tax, total 181 154 170
Deferred tax:      
U.S. federal 31 217 19
State and foreign 4 30 (3)
Deferred tax, total 35 247 16
Total $ 216 $ 401 $ 186