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Income Taxes - Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current income tax expense:      
State income tax $ 1 $ 1 $ 1
Canadian federal and provincial income tax 83 70 99
Total current income tax expense 84 71 100
Deferred income tax expense/(benefit):      
Canadian federal and provincial income tax 16 100 (1)
Total deferred income tax expense/(benefit) 16 100 (1)
Total income tax expense $ 100 $ 171 $ 99