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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current income tax expense (benefit):    
Current year $ 620 $ 561
Adjustments in respect of prior years, including resolution of tax disputes (80) (1)
Total current income tax expense (benefit) 540 560
Deferred income tax expense (benefit):    
Origination and reversal of temporary differences (240) 42
Adjustments in respect of prior years, including resolution of tax disputes (24) (9)
Tax expense (benefit) arising from unrecognized tax losses 8 4
Tax rate and other legislative changes 2 0
Total deferred income tax expense (benefit) (254) 37
Total income tax expense (benefit) $ 286 $ 597