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Description of Business and Segmented Disclosures - Schedule of Capital Expenditures (Detail) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Feb. 28, 2023 | Aug. 31, 2022
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 4,298 | $ 3,708 |  |
Acquisitions (Note 5) | 427 | 1,621 |  |
Total Capital Expenditures | 4,725 | 5,329 |  |
Sunrise Oil Sands Partnership |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo |  |  |  | $ 1,559
Fair value of accounts receivable and accrued revenues recognised as of acquisition date |  |  |  | $ 1,559
BP-Husky Refining LLC |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo |  |  | $ 508 |
Fair value of accounts receivable and accrued revenues recognised as of acquisition date |  |  | 508 |
Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 3,476 | 2,446 |  |
Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 747 | 1,176 |  |
Oil Sands |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 5) | 37 | 1,609 |  |
Oil Sands | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 2,382 | 1,792 |  |
Conventional |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 5) | 5 | 12 |  |
Conventional | Upstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 452 | 344 |  |
Offshore | Upstream | Asia Pacific |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 7 | 8 |  |
Offshore | Upstream | Atlantic |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 635 | 302 |  |
Canadian Refining | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 145 | 117 |  |
U.S. Refining |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Acquisitions (Note 5) | 385 | 0 |  |
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 |
Fair value of accounts receivable and accrued revenues recognised as of acquisition date |  |  | $ 368 |
U.S. Refining | Downstream |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | 602 | 1,059 |  |
Corporate and Eliminations |  |  |  |
Disclosure Of Reportable Segments [Line Items] |  |  |  |
Capital Investment | $ 75 | $ 86 |  |

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