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v3.25.3

Income Taxes - Additional Information (Details) $ in Millions | Sep. 30, 2025 CAD ($)
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
Deferred tax expense income | $ 315
WRB Refining LP |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
Share of equity investment | 50.00%

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