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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Details) - CAD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets $ 430 $ 484
Property, plant and equipment 35,972 38,568
Right-of-use assets 1,914 1,950
Goodwill 2,923 2,923
Assets 53,573 56,539
Oil Sands    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 403 461
Property, plant and equipment 24,873 24,646
Right-of-use assets 946 1,018
Goodwill 2,923 2,923
Assets 31,994 31,668
Conventional    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 20 15
Property, plant and equipment 2,213 2,230
Right-of-use assets 47 57
Goodwill 0 0
Assets 2,551 2,610
Offshore    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 7 8
Property, plant and equipment 3,950 3,365
Right-of-use assets 187 95
Goodwill 0 0
Assets 4,633 4,089
Canadian Refining    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 2,457 2,511
Right-of-use assets 54 39
Goodwill 0 0
Assets 2,934 2,901
U.S Refining    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 2,259 5,538
Right-of-use assets 290 342
Goodwill 0 0
Assets 6,600 9,517
Corporate and Eliminations    
Disclosure Of Reportable Segments [Line Items]    
Intangible exploration and evaluation assets 0 0
Property, plant and equipment 220 278
Right-of-use assets 390 399
Goodwill 0 0
Assets $ 4,861 $ 5,754