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Divestitures (Details) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Oct. 14, 2021
May 01, 2021
Dec. 02, 2020
Dec. 31, 2021
Dec. 31, 2020
 [1]
Dec. 31, 2019
 [1]
Disclosure of analysis of single amount of discontinued operations [line items]            
Before-tax gain on disposal       $ 229 $ 81 $ 2
Headwater Exploration Inc.            
Disclosure of analysis of single amount of discontinued operations [line items]            
Sale of common shares in equity method investment 50          
Proceeds from sales of investment in equity-accounted affiliate $ 228          
Before-tax gain on disposal 116          
After-tax gain on disposal $ 99          
Marten Hills, Alberta            
Disclosure of analysis of single amount of discontinued operations [line items]            
Before-tax gain on disposal   $ 60        
After-tax gain on disposal   47        
Proceeds from disposal of oil and gas assets   $ 102        
Marten Hills, Alberta | Marten Hills            
Disclosure of analysis of single amount of discontinued operations [line items]            
Before-tax gain on disposal     $ 79      
After-tax gain on disposal     65      
Proceeds from disposal of oil and gas assets     33      
Consideration received for sale of operating assets     $ 138      
Consideration received for sale of operating assets, common stock (in shares)     50      
Consideration received for sale of operating assets, common stock     $ 97      
Consideration received for sale of operating assets, purchase warrants (in shares)     15      
Consideration received for sale of operating assets, purchase warrants     $ 8      
East Clearwater and Kaybob            
Disclosure of analysis of single amount of discontinued operations [line items]            
Before-tax gain on disposal       34    
After-tax gain on disposal       25    
Proceeds from disposal of oil and gas assets       $ 103    
[1] See Note 3(w) for revisions to comparative results.