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Description of Business and Segmented Disclosures - Schedule of Assets by Segment (Detail) - CAD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | $ 796 | $ 685
Property, plant and equipment | 36,727 | 36,499
Right-of-use assets | 1,738 | 1,845
Goodwill | 2,923 | 2,923
Assets | 54,427 | 55,869
Current assets | 10,745 | 12,430
Oil Sands |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 785 | 674
Property, plant and equipment | 24,271 | 24,657
Right-of-use assets | 687 | 638
Goodwill | 2,923 | 2,923
Assets | 32,481 | 32,248
Conventional |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 5 | 6
Property, plant and equipment | 2,045 | 2,020
Right-of-use assets | 2 | 2
Goodwill | 0 | 0
Assets | 2,278 | 2,410
Offshore |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 6 | 5
Property, plant and equipment | 2,679 | 2,549
Right-of-use assets | 103 | 152
Goodwill | 0 | 0
Assets | 3,416 | 3,339
Canadian Manufacturing |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 0 | 0
Property, plant and equipment | 2,438 | 2,466
Right-of-use assets | 220 | 252
Goodwill | 0 | 0
Assets | 3,320 | 3,172
U.S. Manufacturing |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 0 | 0
Property, plant and equipment | 4,981 | 4,482
Right-of-use assets | 286 | 329
Goodwill | 0 | 0
Assets | 9,728 | 8,324
Corporate and Eliminations |  |
Disclosure Of Reportable Segments [Line Items] |  |
Intangible exploration and evaluation assets | 0 | 0
Property, plant and equipment | 313 | 325
Right-of-use assets | 440 | 472
Goodwill | 0 | 0
Assets | $ 3,204 | $ 6,376

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