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Exploration and Evaluation Assets - Detailed Information about Exploration and Evaluation Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 2,208 $ 2,226
Additions/Acquisitions   48
Additions, net 108  
Acquisition of Chevron's assets 320  
Transfers to property, plant and equipment (52) (63)
Derecognitions and other (62) (2)
Foreign exchange adjustments 4 (1)
Ending balance 2,526 2,208
Exploration and evaluation assets derecognized through depletion, depreciation and amortization expense 62  
North America    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,031 2,026
Additions/Acquisitions   45
Additions, net 102  
Acquisition of Chevron's assets 320  
Transfers to property, plant and equipment (45) (38)
Derecognitions and other 0 (2)
Foreign exchange adjustments 0 0
Ending balance 2,408 2,031
North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Additions/Acquisitions   0
Additions, net 0  
Acquisition of Chevron's assets 0  
Transfers to property, plant and equipment 0 0
Derecognitions and other 0 0
Foreign exchange adjustments 0 0
Ending balance 0 0
Offshore Africa    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 100 98
Additions/Acquisitions   3
Additions, net 6  
Acquisition of Chevron's assets 0  
Transfers to property, plant and equipment 0 0
Derecognitions and other (62) 0
Foreign exchange adjustments 4 (1)
Ending balance 48 100
Oil Sands Mining and Upgrading    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 77 102
Additions/Acquisitions   0
Additions, net 0  
Acquisition of Chevron's assets 0  
Transfers to property, plant and equipment (7) (25)
Derecognitions and other 0 0
Foreign exchange adjustments 0 0
Ending balance $ 70 $ 77