v3.26.3
DESCRIPTION OF BUSINESS AND SEGMENTED DISCLOSURES - Schedule of Assets by Segment (Details) - CAD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets $ 594 $ 575
Property, plant and equipment 44,804 45,260
Right-of-use assets 1,992 2,153
Goodwill 2,912 2,912
Assets 68,048 63,424
Oil Sands    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 591 568
Property, plant and equipment 33,715 34,149
Right-of-use assets 1,156 1,204
Goodwill 2,912 2,912
Assets 44,013 42,505
Conventional    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 2,156 2,202
Right-of-use assets 32 44
Goodwill 0 0
Assets 2,589 2,579
Offshore    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 3 7
Property, plant and equipment 4,155 4,008
Right-of-use assets 151 180
Goodwill 0 0
Assets 4,863 4,756
Canadian Refining    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 2,227 2,452
Right-of-use assets 43 50
Goodwill 0 0
Assets 2,886 2,831
U.S Refining    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 2,363 2,238
Right-of-use assets 270 287
Goodwill 0 0
Assets 5,355 4,698
Corporate and Eliminations    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 188 211
Right-of-use assets 340 388
Goodwill 0 0
Assets $ 8,342 $ 6,055