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Assets Held for Sale (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
gasStation
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of operating segments [line items]        
Property, Plant and Equipment, Net   $ 34,225 $ 25,411 $ 27,834
Right-of-Use Assets, Net   2,010 1,139 1,325
Goodwill   3,473 2,272 2,272
Lease Liabilities   (2,957) (1,757) (1,916)
Decommissioning Liabilities   (3,906) (1,248) $ (1,235)
Non-current assets held for sale        
Disclosure of operating segments [line items]        
Property, Plant and Equipment, Net   1,162    
Right-of-Use Assets, Net   54    
Goodwill   88    
Liabilities classified as held for sale        
Disclosure of operating segments [line items]        
Lease Liabilities   (58)    
Decommissioning Liabilities   $ (128)    
Retail        
Disclosure of operating segments [line items]        
Assets held-for-sale, number of gas stations | gasStation   337    
Consideration for sale of assets held for sale   $ 420    
Operating margin associated with assets held for sale   64    
Property, Plant and Equipment, Net   205 0  
Right-of-Use Assets, Net   49 0  
Goodwill   0 $ 0  
Retail | Non-current assets held for sale        
Disclosure of operating segments [line items]        
Property, Plant and Equipment, Net   498    
Right-of-Use Assets, Net   54    
Goodwill   0    
Retail | Liabilities classified as held for sale        
Disclosure of operating segments [line items]        
Lease Liabilities   (58)    
Decommissioning Liabilities   (86)    
Tucker        
Disclosure of operating segments [line items]        
Proceeds from disposal of oil and gas assets $ 800      
Tucker | Non-current assets held for sale        
Disclosure of operating segments [line items]        
Property, Plant and Equipment, Net   505    
Right-of-Use Assets, Net   0    
Goodwill   88    
Tucker | Liabilities classified as held for sale        
Disclosure of operating segments [line items]        
Lease Liabilities   0    
Decommissioning Liabilities   (33)    
Wembley        
Disclosure of operating segments [line items]        
Consideration for sale of assets held for sale   238    
Wembley | Non-current assets held for sale        
Disclosure of operating segments [line items]        
Property, Plant and Equipment, Net   159    
Right-of-Use Assets, Net   0    
Goodwill   0    
Wembley | Liabilities classified as held for sale        
Disclosure of operating segments [line items]        
Lease Liabilities   0    
Decommissioning Liabilities   $ (9)