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Inventories - Schedule of Inventories (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of inventories [line items] |  |
Total Product | $ 4,009 | $ 3,651
Parts and supplies | 303 | 268
Current inventories | 4,312 | 3,919
Crude Oil |  |
Disclosure of inventories [line items] |  |
Total Product | 2,424 | 2,060
Diluent |  |
Disclosure of inventories [line items] |  |
Total Product | 366 | 515
Natural Gas and NGLs |  |
Disclosure of inventories [line items] |  |
Total Product | 50 | 33
Refined Products |  |
Disclosure of inventories [line items] |  |
Total Product | $ 1,169 | $ 1,043

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