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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current income tax expense (benefit):    
Current year $ 859 $ 620
Adjustments in respect of prior years, including resolution of tax disputes 7 (80)
Total current income tax expense (benefit) 866 540
Deferred income tax expense (benefit):    
Origination and reversal of temporary differences (435) (240)
Adjustments in respect of prior years, including resolution of tax disputes 48 (24)
Tax expense (benefit) arising from unrecognized tax losses 15 8
Tax rate and other legislative changes 1 2
Total deferred income tax expense (benefit) (371) (254)
Total income tax expense (benefit) $ 495 $ 286