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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Current income tax expense (benefit):    
Current year $ 561 $ 445
Adjustments in respect of prior years, including resolution of tax disputes (1) 25
Tax rate and other legislative changes 0 46
Total current income tax expense (benefit) 560 516
Deferred income tax expense (benefit):    
Origination and reversal of temporary differences 42 (151)
Tax expense (benefit) arising from unrecognized tax losses 4 0
Adjustments in respect of prior years, including resolution of tax disputes (9) (10)
Tax rate and other legislative changes 0 (53)
Total deferred income tax expense (benefit) 37 (214)
Total income tax expense (benefit) $ 597 $ 302