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Income Taxes - Components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current income tax expense: |  |  |
State income tax | $ 1 | $ 2 | $ 1
Canadian federal and provincial income tax | 27 | 83 | 83
Total current income tax expense | 28 | 85 | 84
Deferred income tax expense/(benefit): |  |  |
Canadian federal and provincial income tax | 16 | (60) | 16
Total deferred income tax expense/(benefit) | 16 | (60) | 16
Total income tax expense | $ 44 | $ 25 | $ 100

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