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Property, Plant and Equipment - Narrative (Details)
 12 Months Ended
Dec. 31, 2021
CAD ($)
property
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 17, 2021
CAD ($)
Oct. 06, 2020
CAD ($)
Jun. 27, 2019
CAD ($)
Disclosure of detailed information about property, plant and equipment [line items]            
Interest costs capitalized $ 0 $ 24,000,000 $ 53,000,000      
Weighted average capitalization rate   3.50% 4.00%      
British Columbia - Gas Producing Assets And Processing Infrastructure Segment            
Disclosure of detailed information about property, plant and equipment [line items]            
Number of acquisitions | property 2          
Property, plant and equipment $ 257,000,000          
Exploration and evaluation assets 13,000,000          
Total purchase consideration 131,000,000          
Asset retirement obligations 58,000,000          
Non-current liabilities recognised as of acquisition date 65,000,000          
Deferred tax asset 462,000,000          
Gains on acquisitions of property, plant and equipment, pre-tax 478,000,000          
North America            
Disclosure of detailed information about property, plant and equipment [line items]            
Asset retirement obligations     $ 20,000,000      
Gains on acquisitions of property, plant and equipment, pre-tax     0      
Net cash paid for consideration for acquisition of exploration and evaluation assets     80,000,000      
Deferred tax liability     0      
Oil Sands Mining and Upgrading            
Disclosure of detailed information about property, plant and equipment [line items]            
Project costs not subject to depletion and depreciation 118,000,000 $ 117,000,000        
STORM Resources Ltd            
Disclosure of detailed information about property, plant and equipment [line items]            
Less: cash consideration       $ 771,000,000    
Pro forma revenue 294,000,000          
Pro forma net operating income 205,000,000          
Property, plant and equipment       1,114,000,000    
Exploration and evaluation assets       13,000,000    
Total purchase consideration $ 771,000,000          
Asset retirement obligations       18,000,000    
Non-current liabilities recognised as of acquisition date       35,000,000    
Deferred tax liability       $ 140,000,000    
Devon            
Disclosure of detailed information about property, plant and equipment [line items]            
Property, plant and equipment           $ 3,325,000,000
Exploration and evaluation assets     91,000,000     91,000,000
Total purchase consideration     3,412,000,000     3,412,000,000
Asset retirement obligations           178,000,000
Revenue of acquiree since acquisition date     1,540,000,000      
Revenue net of blending, production, transportation, and feedstock expense     590,000,000      
Painted Pony Energy Ltd            
Disclosure of detailed information about property, plant and equipment [line items]            
Less: cash consideration         $ 111,000,000  
Property, plant and equipment         750,000,000  
Exploration and evaluation assets   15,000,000     15,000,000  
Total purchase consideration   $ 111,000,000        
Asset retirement obligations         13,000,000  
Non-current liabilities recognised as of acquisition date         442,000,000  
Deferred tax asset         $ 211,000,000  
Non-revolving term credit facility maturing June 2022            
Disclosure of detailed information about property, plant and equipment [line items]            
Maximum credit facility     $ 3,250,000,000     $ 3,250,000,000