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Acquisitions - BP-Husky, Summary of Goodwill (Details) $ in Millions, $ in Millions | Sep. 30, 2023 CAD ($) | Feb. 28, 2023 CAD ($) | Feb. 28, 2023 USD ($) | Dec. 31, 2022 CAD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill | $ 2,923 |  |  | $ 2,923
BP-Husky Refining LLC |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total Purchase Consideration |  | $ 502 | $ 369 |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo |  | 494 |  |
Fair Value of Identifiable Net Assets |  | (996) |  |
Goodwill |  | $ 0 |  |

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