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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | $ 463 | $ 738
Property, plant and equipment | 37,598 | 37,250
Right-of-use assets | 1,672 | 1,680
Goodwill | 2,923 | 2,923
Assets | 54,680 | 53,915
Current assets | 10,176 | 9,708
Oil Sands |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 449 | 729
Property, plant and equipment | 24,461 | 24,443
Right-of-use assets | 822 | 849
Goodwill | 2,923 | 2,923
Assets | 30,986 | 31,673
Conventional |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 7 | 0
Property, plant and equipment | 2,127 | 2,209
Right-of-use assets | 2 | 1
Goodwill | 0 | 0
Assets | 2,444 | 2,429
Offshore |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 7 | 9
Property, plant and equipment | 3,118 | 2,798
Right-of-use assets | 96 | 102
Goodwill | 0 | 0
Assets | 3,845 | 3,511
Corporate and Eliminations |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 0 | 0
Property, plant and equipment | 280 | 317
Right-of-use assets | 406 | 432
Goodwill | 0 | 0
Assets | 5,466 | 4,682
Canadian Refining |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 0 | 0
Property, plant and equipment | 2,484 | 2,469
Right-of-use assets | 40 | 28
Goodwill | 0 | 0
Assets | 2,960 | 2,960
U.S Refining |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 0 | 0
Property, plant and equipment | 5,128 | 5,014
Right-of-use assets | 306 | 268
Goodwill | 0 | 0
Assets | $ 8,979 | $ 8,660

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