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Divestitures - Additional Information (Detail) - CAD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 02, 2020
Dec. 31, 2018
Disclosure Of Disposals [Line Items]    
Gain (Loss) before tax on sale of assets   $ 797
Gain (Loss) after tax on sale of assets   557
Marten Hills Oil Assets [Member]    
Disclosure Of Disposals [Line Items]    
Proceeds from sale of assets $ 138  
Gain (Loss) before tax on sale of assets 79  
Gain (Loss) after tax on sale of assets 65  
Consideration received as cash 33  
Consideration received as common shares $ 97  
Number of shares received as consideration 50  
Consideration received as warrants 15  
Term of warrants 3 years  
Exercise price of warrants $ 2.00  
Warrants value $ 8  
Gross overriding royalty $ 41  
Cenovus Pipestone Partnership [Member]    
Disclosure Of Disposals [Line Items]    
Proceeds from sale of assets   $ 625
Wembley Gas Plant [Member]    
Disclosure Of Disposals [Line Items]    
Percentage of operating working capital interest   39.00%