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Exploration and Evaluation Assets - Detailed information about exploration and evaluation assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance $ 2,579 $ 2,637
Additions 55 71
Acquisition of Devon assets   91
Transfers to property, plant and equipment (194) (219)
Derecognitions and other (3)  
Foreign exchange adjustments (1) (1)
Ending balance 2,436 2,579
North America    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 2,258 2,348
Additions 40 38
Acquisition of Devon assets   91
Transfers to property, plant and equipment (194) (219)
Derecognitions and other (3)  
Foreign exchange adjustments 0 0
Ending balance 2,101 2,258
North Sea    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 0 0
Additions 0 0
Acquisition of Devon assets   0
Transfers to property, plant and equipment 0 0
Derecognitions and other 0  
Foreign exchange adjustments 0 0
Ending balance 0 0
Offshore Africa    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 69 37
Additions 15 33
Acquisition of Devon assets   0
Transfers to property, plant and equipment 0 0
Derecognitions and other 0  
Foreign exchange adjustments (1) (1)
Ending balance 83 69
Oil Sands Mining and Upgrading    
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]    
Beginning balance 252 252
Additions 0 0
Acquisition of Devon assets   0
Transfers to property, plant and equipment 0 0
Derecognitions and other 0  
Foreign exchange adjustments 0 0
Ending balance $ 252 $ 252