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Income Taxes - Change in Deferred Income Tax Balances (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net deferred tax income tax liability, beginning of year $ 11,433 $ 11,180
Recognized in deferred income tax expense 440 249
Recognized in other comprehensive income 39 19
Foreign exchange, disposition and other 5 (15)
Net deferred income tax liability, end of year $ 11,917 $ 11,433