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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Reportable Segments [Line Items]    
E&E Assets $ 484 $ 738
PP&E 38,568 37,250
ROU Assets 1,950 1,680
Goodwill 2,923 2,923
Total Assets 56,539 53,915
Oil Sands    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 461 729
PP&E 24,646 24,443
ROU Assets 1,018 849
Goodwill 2,923 2,923
Total Assets 31,668 31,673
Conventional    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 15 0
PP&E 2,230 2,209
ROU Assets 57 1
Goodwill 0 0
Total Assets 2,610 2,429
Offshore    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 8 9
PP&E 3,365 2,798
ROU Assets 95 102
Goodwill 0 0
Total Assets 4,089 3,511
Canadian Refining    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 0 0
PP&E 2,511 2,469
ROU Assets 39 28
Goodwill 0 0
Total Assets 2,901 2,960
U.S. Refining    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 0 0
PP&E 5,538 5,014
ROU Assets 342 268
Goodwill 0 0
Total Assets 9,517 8,660
Corporate and Eliminations    
Disclosure Of Reportable Segments [Line Items]    
E&E Assets 0 0
PP&E 278 317
ROU Assets 399 432
Goodwill 0 0
Total Assets $ 5,754 $ 4,682