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Property, Plant and Equipment - Summary of Net Assets Acquired and Liablities Assumed (Details) - CAD ($)
$ in Millions
Oct. 06, 2020
Dec. 17, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 27, 2019
STORM Resources Ltd          
Disclosure of detailed information about property, plant and equipment [line items]          
Property, plant and equipment   $ 1,114      
Exploration and evaluation assets   13      
Working capital   20      
Long-term debt   (183)      
Asset retirement obligations   (18)      
Other long-term liabilities   (35)      
Deferred tax liability   (140)      
Net assets acquired   771      
Less: cash consideration   $ 771      
Devon          
Disclosure of detailed information about property, plant and equipment [line items]          
Property, plant and equipment         $ 3,325
Exploration and evaluation assets       $ 91 91
Inventory, prepaids and other long-term assets         195
Accrued liabilities         (21)
Asset retirement obligations         (178)
Net assets acquired         $ 3,412
Painted Pony Energy Ltd          
Disclosure of detailed information about property, plant and equipment [line items]          
Property, plant and equipment $ 750        
Exploration and evaluation assets 15   $ 15    
Other long-term assets 204        
Long-term debt (397)        
Asset retirement obligations (13)        
Other long-term liabilities (442)        
Deferred tax asset 211        
Net assets acquired 328        
Less: cash consideration 111        
Gain on acquisition $ 217