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Income Taxes - Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current income tax expense:      
State income tax $ 3 $ 3 $ 1
Canadian federal and provincial income tax 109 63 27
Total current income tax expense 112 66 28
Deferred income tax expense/(benefit):      
Canadian federal and provincial income tax (46) 132 16
Total deferred income tax expense/(benefit) (46) 132 16
Total income tax expense $ 66 $ 198 $ 44