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Inventories - Schedule of Inventories (Detail) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of inventories [line items] |  |
Total Product | $ 3,951 | $ 3,604
Parts and Supplies | 545 | 426
Current inventories | 4,496 | 4,030
Crude Oil |  |
Disclosure of inventories [line items] |  |
Total Product | 2,297 | 2,084
Diluent |  |
Disclosure of inventories [line items] |  |
Total Product | 401 | 379
Natural Gas and NGLs |  |
Disclosure of inventories [line items] |  |
Total Product | 77 | 68
Refined Products |  |
Disclosure of inventories [line items] |  |
Total Product | $ 1,176 | $ 1,073

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