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Exploration and Evaluation Assets - Narrative (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 17, 2021
Dec. 31, 2020
Oct. 06, 2020
Dec. 31, 2019
Jun. 27, 2019
STORM Resources Ltd            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Cash consideration   $ 771        
Exploration and evaluation assets   $ 13        
Total purchase consideration $ 771          
Painted Pony Energy Ltd            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Cash consideration       $ 111    
Exploration and evaluation assets     $ 15 $ 15    
Total purchase consideration     $ 111      
Devon            
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]            
Exploration and evaluation assets         $ 91 $ 91
Total purchase consideration         $ 3,412 $ 3,412