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Exploration and Evaluation Assets - Detailed information about exploration and evaluation assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 2,226 $ 2,250
Additions/Acquisitions 48 46
Transfers to property, plant and equipment (63) (71)
Derecognitions and other (2) (1)
Foreign exchange adjustments (1) 2
Ending balance 2,208 2,226
North America    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 2,026 2,057
Additions/Acquisitions 45 41
Transfers to property, plant and equipment (38) (71)
Derecognitions and other (2) (1)
Foreign exchange adjustments 0 0
Ending balance 2,031 2,026
North Sea    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 0 0
Additions/Acquisitions 0 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 98 91
Additions/Acquisitions 3 5
Transfers to property, plant and equipment 0 0
Derecognitions and other 0 0
Foreign exchange adjustments (1) 2
Ending balance 100 98
Oil Sands Mining and Upgrading    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 102 102
Additions/Acquisitions 0 0
Transfers to property, plant and equipment (25) 0
Derecognitions and other 0 0
Foreign exchange adjustments 0 0
Ending balance $ 77 $ 102