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Exploration and Evaluation Assets - Detailed information about exploration and evaluation assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance $ 2,250 $ 2,436
Additions/Acquisitions (note 7) 46 38
Transfers to property, plant and equipment (71) (223)
Derecognitions and other (1) (1)
Foreign exchange adjustments 2  
Ending balance 2,226 2,250
North America    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 2,057 2,101
Additions/Acquisitions (note 7) 41 30
Transfers to property, plant and equipment (71) (73)
Derecognitions and other (1) (1)
Foreign exchange adjustments 0  
Ending balance 2,026 2,057
North Sea    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 0 0
Additions/Acquisitions (note 7) 0 0
Transfers to property, plant and equipment 0 0
Derecognitions and other 0 0
Foreign exchange adjustments 0  
Ending balance 0 0
Offshore Africa    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 91 83
Additions/Acquisitions (note 7) 5 8
Transfers to property, plant and equipment 0 0
Derecognitions and other 0 0
Foreign exchange adjustments 2  
Ending balance 98 91
Oil Sands Mining and Upgrading    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 102 252
Additions/Acquisitions (note 7) 0 0
Transfers to property, plant and equipment 0 (150)
Derecognitions and other 0 0
Foreign exchange adjustments 0  
Ending balance $ 102 $ 102