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Acquisitions and Divestitures - Additional information (Detail) $ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2023 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Feb. 28, 2023 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Before-tax gain on disposal | [1] |  | $ 119 | $ (20) |
Conventional |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Before-tax gain on disposal |  |  | 51 |  |
After-tax gain on disposal |  |  | 39 |  |
Proceeds from disposal of oil and gas assets |  |  | 39 |  |
Duvernay Energy Corporation |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Fair value of non-monetary assets contributed to joint venture |  |  | 94 |  |
Other cash payments to acquire interests in joint ventures, classified as investing activities |  |  | $ 18 |  |
Proportion of ownership interest in joint venture |  |  | 30.00% |  |
Investments in joint ventures accounted for using equity method |  |  | $ 84 |  |
Before-tax gain on disposal |  |  | 65 |  |
After-tax gain on disposal |  |  | $ 50 |  |
BP-Husky Refining LLC |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Agreement to purchase remaining ownership |  | 50.00% |  |  |
Total Purchase Consideration |  | $ 514 |  |  | $ 378
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo |  | 508 |  |  |
Carrying value of investment in joint ventures recognised​ as of​ acquisition​ date |  | 554 |  |  |
Non-cash revaluation loss, before tax |  | 34 |  |  |
Non-cash revaluation loss, after tax |  | 23 |  |  |
Non-cash revaluation loss, cumulative foreign exchange |  | $ 12 |  |  |
Toledo CGU |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  | $ 11 |
[1] | (1)Revised presentation as of January 1, 2024. See Note 4.

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