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Income Taxes - Income Tax Benefit (Expense) Recognized Directly in Equity (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income tax benefit (expense):    
Current income tax benefit (expense) $ (2) $ (12)
Deferred income tax benefit (expense) (112) (51)
Total income tax benefit (expense) included in other comprehensive income (loss) (114) (63)
Deferred income tax benefit (expense) (1) 9
Total income tax benefit (expense) recorded in equity, including tax benefit (expense) recorded in Other comprehensive income $ (115) $ (54)