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Exploration and Evaluation Assets - Impairment Booked for Cash Generating Untis (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
CAD ($)
cashGeneratingUnit
Jun. 30, 2021
CAD ($)
cashGeneratingUnit
Dec. 31, 2021
CAD ($)
cashGeneratingUnit
Dec. 31, 2020
CAD ($)
cashGeneratingUnit
Disclosure of detailed information about property, plant and equipment [line items]        
Number of cash generating units | cashGeneratingUnit 6 6 5 6
Impairment loss (reversal of impairment loss) recognised in profit or loss   $ (1,126,415,000) $ (416,000,000)  
Conventional CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss (reversal of impairment loss) recognised in profit or loss   (15,000,000) (19,000,000)  
Peace River CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss (reversal of impairment loss) recognised in profit or loss   (154,000,000) (251,000,000)  
Lloydminster CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss (reversal of impairment loss) recognised in profit or loss   (154,000,000) (146,000,000)  
Viking CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss (reversal of impairment loss) recognised in profit or loss   (356,000,000) 0  
Eagle Ford CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss (reversal of impairment loss) recognised in profit or loss   $ (442,415,000) $ 0  
Conventional, Peace River, Lloydminster, And Duvernay        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss (reversal of impairment loss) recognised in profit or loss       $ 0
Exploration and evaluation assets        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss on financial assets $ 127,861,000      
Exploration and evaluation assets | Conventional CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss on financial assets 4,000,000      
Exploration and evaluation assets | Peace River CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss on financial assets 20,000,000      
Exploration and evaluation assets | Lloydminster CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss on financial assets 42,000,000      
Exploration and evaluation assets | Viking CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss on financial assets 13,000,000      
Exploration and evaluation assets | Eagle Ford CGU        
Disclosure of detailed information about property, plant and equipment [line items]        
Impairment loss on financial assets $ 48,861,000