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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:      
Federal $ 134 $ 172 $ 72
State 3 8 3
Foreign (6) 6 0
Total current 131 186 75
Deferred:      
Federal 19 (10) 0
State 2 4 (2)
Foreign 1 (1) 0
Total deferred 22 (7) (2)
Total provision for income taxes $ 153 $ 179 $ 73