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Property, Plant and Equipment - Narrative (Details)
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
property
Dec. 31, 2020
CAD ($)
Dec. 17, 2021
CAD ($)
Oct. 06, 2020
CAD ($)
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Borrowing costs capitalised $ 0 $ 0 $ 24,000,000    
Weighted average capitalization rate     3.50%    
Accumulated depletion and depreciation          
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Recoverability charge 1,620,000,000        
STORM Resources Ltd          
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Total purchase consideration   771,000,000      
Asset retirement obligations       $ 18,000,000  
Deferred tax liability       140,000,000  
Cash consideration       771,000,000  
Property, plant and equipment       1,114,000,000  
Exploration and evaluation assets       13,000,000  
Non-current liabilities recognised as of acquisition date       $ 35,000,000  
Painted Pony Energy Ltd          
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Cash consideration         $ 111,000,000
North Sea | Accumulated depletion and depreciation | Operating segments          
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Recoverability charge, net of taxes 651,000,000        
Recoverability charge 1,620,000,000        
Deferred income tax recovery 969,000,000        
Oil Sands Mining and Upgrading          
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Project costs not subject to depletion and depreciation 162,000,000 118,000,000      
Oil Sands Mining and Upgrading | Accumulated depletion and depreciation | Operating segments          
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Recoverability charge 0        
North America Exploration And Production segment - Crude Oil And Natural Gas Properties          
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Total purchase consideration 513,000,000        
Asset retirement obligations 11,000,000        
Deferred tax liability 0        
Gains on acquisitions of property, plant and equipment, pre-tax $ 0        
British Columbia - Gas Producing Assets And Processing Infrastructure Segment          
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]          
Total purchase consideration   131,000,000      
Asset retirement obligations   58,000,000      
Gains on acquisitions of property, plant and equipment, pre-tax   $ 478,000,000      
Number of acquisitions | property   2      
Property, plant and equipment   $ 257,000,000      
Exploration and evaluation assets   13,000,000      
Non-current liabilities recognised as of acquisition date   65,000,000      
Deferred tax asset   $ 462,000,000