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Acquisitions and Divestitures - BP-Husky, Summary of Goodwill (Details) $ in Millions, $ in Millions	Dec. 31, 2024 CAD ($)	Dec. 31, 2023 CAD ($)	Feb. 28, 2023 CAD ($)	Feb. 28, 2023 USD ($)
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			$ 514	$ 378
Fair Value of Pre-Existing 50 Percent Ownership Interest in Toledo			508
Fair Value of Identifiable Net Assets			(1,022)
Goodwill			$ 0

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