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Decommissioning Liabilities - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Feb. 28, 2023
Disclosure of other provisions [line items] |  |  |
Estimated future cash flows required to settle the obligation | $ 15,600 | $ 15,000 |
Expected settlement of decommissioning liabilities | $ 203 |  |
Credit-adjusted risk-free rate | 5.20% | 5.50% |
Inflation rate | 2.00% | 2.00% |
Restricted Cash | $ 241 | $ 211 |
BP-Husky Refining LLC |  |  |
Disclosure of other provisions [line items] |  |  |
Carrying value of pre-existing decommissioning liabilities |  |  | $ 2

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