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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Feb. 28, 2023
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | $ 5,015 | $ 4,298 |
Acquisitions | 22 | 427 |
Total Capital Expenditures | 5,037 | 4,725 |
BP-Husky Refining LLC |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo |  |  | $ 508
Upstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 4,280 | 3,476 |
Downstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 696 | 747 |
Oil Sands |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Acquisitions | 9 | 37 |
Oil Sands | Upstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 2,714 | 2,382 |
Conventional |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Acquisitions | 13 | 5 |
Conventional | Upstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 421 | 452 |
Offshore | Upstream | Atlantic |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 1,077 | 635 |
Offshore | Upstream | Asia Pacific |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 68 | 7 |
Canadian Refining | Downstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 208 | 145 |
U.S. Refining |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Acquisitions | 0 | 385 |
U.S. Refining | BP-Husky Refining LLC |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo |  | 368 |
U.S. Refining | Downstream |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | 488 | 602 |
Corporate and Eliminations |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |
Capital Investment | $ 39 | $ 75 |

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