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Inventories - Schedule of Inventories (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of inventories [line items] |  |
Total Product | $ 3,604 | $ 4,009
Parts and supplies | 426 | 303
Current inventories | 4,030 | 4,312
Crude Oil |  |
Disclosure of inventories [line items] |  |
Total Product | 2,084 | 2,424
Diluent |  |
Disclosure of inventories [line items] |  |
Total Product | 379 | 366
Natural Gas and NGLs |  |
Disclosure of inventories [line items] |  |
Total Product | 68 | 50
Refined Products |  |
Disclosure of inventories [line items] |  |
Total Product | $ 1,073 | $ 1,169

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