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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

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