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Exploration and Evaluation Assets - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
agreement
Dec. 31, 2018
USD ($)
agreement
Oct. 06, 2020
CAD ($)
Jun. 27, 2019
CAD ($)
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Disposals of exploration and evaluation assets $ 3          
Proceeds from disposal of exploration and evaluation assets 31 $ 0 $ 16      
Farm-out agreements, working interest retained     20.00% 20.00%    
North America            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Asset retirement obligations   20 $ 13      
Disposals of exploration and evaluation assets 3          
Offshore Africa            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Number of farm-out agreements | agreement     2 2    
Disposals of exploration and evaluation assets $ 0          
Painted Pony Energy Ltd            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Total purchase consideration         $ 111  
Exploration and evaluation assets         15  
Property, plant and equipment         750  
Deferred tax asset         211  
Asset retirement obligations         $ 13  
Devon            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Total purchase consideration   3,412       $ 3,412
Exploration and evaluation assets   $ 91       91
Property, plant and equipment           3,325
Asset retirement obligations           $ 178
Laricina Energy Ltd | North America            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Total purchase consideration     $ 46      
Exploration and evaluation assets     118      
Property, plant and equipment     44      
Cash     24      
Deferred tax asset     168      
Net working capital liabilities recognised as of acquisition date     18      
Asset retirement obligations     17      
Notes payable recognised as of acquisition date     48      
Gain recognised on acquisition, pre-tax     $ 225      
Farm-Out Agreements, Offshore Africa | Offshore Africa            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Farm-out agreements, working interest disposed     30.00% 30.00%    
Disposals of exploration and evaluation assets     $ 89      
Disposals of exploration and evaluation assets, costs incurred in past fiscal year recovered     14      
Proceeds from disposal of exploration and evaluation assets     105 $ 79    
Gain recognised on farm-out, pre-tax     16      
Gain recognised on farm-out, after-tax     $ 12