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Income Taxes - Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current income tax expense:      
State income tax $ 3 $ 1 $ 2
Canadian federal and provincial income tax 63 27 83
Total current income tax expense 66 28 85
Deferred income tax expense/(benefit):      
Canadian federal and provincial income tax 132 16 (60)
Total deferred income tax expense/(benefit) 132 16 (60)
Total income tax expense $ 198 $ 44 $ 25