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Segmented Information - Geographical information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]    
Operating revenues, net of royalties $ 38,542.0 $ 31,954.0
Non-current assets excluding deferred income tax assets 80,751.0 79,817.0
Canada    
Disclosure of operating segments [line items]    
Operating revenues, net of royalties 30,418.0 25,551.0
Non-current assets excluding deferred income tax assets 76,708.0 76,091.0
United States    
Disclosure of operating segments [line items]    
Operating revenues, net of royalties 5,999.0 4,252.0
Non-current assets excluding deferred income tax assets 1,889.0 1,712.0
Other foreign    
Disclosure of operating segments [line items]    
Operating revenues, net of royalties 2,125.0 2,151.0
Non-current assets excluding deferred income tax assets $ 2,154.0 $ 2,014.0