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Income Taxes - Income Tax Benefit (Expense) Recognized Directly in Equity (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income tax benefit (expense):    
Current income tax benefit (expense) $ (4) $ 2
Deferred income tax benefit (expense) 24 (64)
Total income tax benefit (expense) included in other comprehensive income (loss) 20 (62)
Deferred income tax benefit (expense) 9 0
Total income tax benefit (expense) recorded in equity, including tax benefit (expense) recorded in other comprehensive income $ 29 $ (62)