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Acquisitions and Divestitures (Details) - CAD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 13, 2022
Jun. 08, 2022
May 31, 2022
Feb. 28, 2022
Jan. 31, 2022
Sep. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
 [1]
Disclosure of analysis of single amount of discontinued operations [line items]                    
Before-tax gain on disposal             $ 62 $ 60 [1] $ 304 $ 72
White Rose Field                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Before-tax gain on disposal           $ 62        
After-tax gain on disposal           $ 47        
Percentage of working interest acquired           1250.00%        
Payment to transfer working interest     $ 50              
Tucker                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Proceeds from disposal of oil and gas assets         $ 730          
Before-tax gain on disposal         165          
After-tax gain on disposal         $ 126          
Wembley                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Proceeds from disposal of oil and gas assets       $ 221            
Before-tax gain on disposal       76            
After-tax gain on disposal       $ 58            
Headwater Exploration Inc.                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Proceeds from disposal of oil and gas assets   $ 110                
Sunrise Oil Sands Partnership                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Agreement to purchase remaining ownership 50.00%                  
Purchase of oil and gas assets $ 600                  
Contingent consideration maximum payment $ 600                  
Contingent consideration period of transaction 2 years                  
Proportion of ownership interest in joint operation 35.00%               50.00%  
Marten Hills, Alberta                    
Disclosure of analysis of single amount of discontinued operations [line items]                    
Proceeds from disposal of oil and gas assets               102    
Before-tax gain on disposal               60    
After-tax gain on disposal               $ 47    
[1] See Note 3 for revisions to prior period results.