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Divestitures (Details)
shares in Millions, $ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Sep. 13, 2022
CAD ($)
gasStation
Jun. 08, 2022
CAD ($)
May 31, 2022
CAD ($)
Feb. 28, 2022
CAD ($)
Jan. 31, 2022
CAD ($)
Oct. 14, 2021
CAD ($)
shares
May 01, 2021
CAD ($)
Dec. 02, 2020
CAD ($)
shares
Sep. 30, 2021
CAD ($)
Aug. 31, 2021
CAD ($)
Sep. 30, 2021
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
 [1]
Dec. 31, 2020
CAD ($)
 [1]
Disclosure of analysis of single amount of discontinued operations [line items]                            
Before-tax gain (loss) on disposal                       $ 269 $ 229 $ 81
Retail                            
Disclosure of analysis of single amount of discontinued operations [line items]                            
Before-tax gain (loss) on disposal $ (74)                          
After-tax gain (loss) on disposal $ (56)                          
Number of stores sold | gasStation 337                          
Consideration for sale of assets held for sale $ 404                          
White Rose Field                            
Disclosure of analysis of single amount of discontinued operations [line items]                            
Before-tax gain (loss) on disposal                 $ 62          
After-tax gain (loss) on disposal                 $ 47          
Percentage of working interest acquired                 12.50%   12.50%      
Payment to transfer working interest     $ 50                      
Wembley                            
Disclosure of analysis of single amount of discontinued operations [line items]                            
Proceeds from disposal of oil and gas assets       $ 221                    
Before-tax gain (loss) on disposal       76                    
After-tax gain (loss) on disposal       $ 58                    
Tucker                            
Disclosure of analysis of single amount of discontinued operations [line items]                            
Proceeds from disposal of oil and gas assets         $ 730                  
Before-tax gain (loss) on disposal         165                  
After-tax gain (loss) on disposal         $ 126                  
Headwater Exploration Inc.                            
Disclosure of analysis of single amount of discontinued operations [line items]                            
Proceeds from disposal of oil and gas assets   $ 110                        
Headwater Exploration Inc.                            
Disclosure of analysis of single amount of discontinued operations [line items]                            
Before-tax gain (loss) on disposal           $ 116                
After-tax gain (loss) on disposal           $ 99                
Sale of common shares in equity method investment | shares           50                
Proceeds from sales of investment in equity-accounted affiliate           $ 228                
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 (loss) on disposal             60              
After-tax gain (loss) on disposal             $ 47              
Marten Hills, Alberta | Marten Hills                            
Disclosure of analysis of single amount of discontinued operations [line items]                            
Proceeds from disposal of oil and gas assets               $ 33            
Before-tax gain (loss) on disposal               79            
After-tax gain (loss) on disposal               65            
Consideration received for sale of operating assets               $ 138            
Consideration received for sale of operating assets, common stock (in shares) | shares               50            
Consideration received for sale of operating assets, common stock               $ 97            
Consideration received for sale of operating assets, purchase warrants (in shares) | 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]                            
Proceeds from disposal of oil and gas assets                   $ 82        
Before-tax gain (loss) on disposal                     $ 17      
After-tax gain (loss) on disposal                     $ 13      
[1] See Note 3X for revisions to prior period results.