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Property, Plant and Equipment - Narrative (Details)
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
property
STORM Resources Ltd      
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]      
Cash consideration     $ 771,000,000
North Sea      
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items]      
Recoverability charge, net of taxes $ 113,000,000 $ 651,000,000  
Recoverability charge 436,000,000 1,620,000,000  
Deferred income tax recovery 323,000,000 969,000,000  
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 $ 191,000,000 162,000,000  
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 assets recognised as of acquisition date     $ 462,000,000