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Property, Plant and Equipment - Summary of Net Assets Acquired and Liablities Assumed (Details) - CAD ($)
$ in Millions
Oct. 06, 2020
Dec. 31, 2019
Jun. 27, 2019
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
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    
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    
Net assets acquired 328    
Less: cash consideration 111    
Gain on acquisition $ 217