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Acquisitions - Sunrise Oil Sands Partnership, Summary of Goodwill (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Aug. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill | $ 2,923 | $ 2,923 |  | $ 3,473
Sunrise Oil Sands Partnership |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total Purchase Consideration |  |  | $ 1,034 |
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo |  |  | 1,559 |
Total Identifiable Net Assets |  |  | (2,593) |
Goodwill |  |  | $ 0 |

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