v3.26.1
Exploration and Evaluation Assets - Detailed Information about Exploration and Evaluation Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 2,526 $ 2,208
Additions, net   108
Acquisition of Chevron's assets   320
Transfers to property, plant and equipment (35) (52)
Derecognitions and other (46) (62)
Additions/Acquisitions, net 208  
Foreign exchange adjustments (2) 4
Ending balance 2,651 2,526
Exploration and evaluation assets derecognized through depletion, depreciation and amortization expense 46 62
North America    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,408 2,031
Additions, net   102
Acquisition of Chevron's assets   320
Transfers to property, plant and equipment (21) (45)
Derecognitions and other 0 0
Additions/Acquisitions, net 207  
Foreign exchange adjustments 0 0
Ending balance 2,594 2,408
North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Additions, net   0
Acquisition of Chevron's assets   0
Transfers to property, plant and equipment 0 0
Derecognitions and other 0 0
Additions/Acquisitions, net 0  
Foreign exchange adjustments 0 0
Ending balance 0 0
Offshore Africa    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 48 100
Additions, net   6
Acquisition of Chevron's assets   0
Transfers to property, plant and equipment 0 0
Derecognitions and other (46) (62)
Additions/Acquisitions, net 0  
Foreign exchange adjustments (2) 4
Ending balance 0 48
Exploration and evaluation assets derecognized through depletion, depreciation and amortization expense 46  
Oil Sands Mining and Upgrading    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 70 77
Additions, net   0
Acquisition of Chevron's assets   0
Transfers to property, plant and equipment (14) (7)
Derecognitions and other 0 0
Additions/Acquisitions, net 1  
Foreign exchange adjustments 0 0
Ending balance $ 57 $ 70