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Inventories - Schedule of Inventories (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of inventories [line items] |  |
Parts and Supplies | $ 93 | $ 87
Inventories | 1,089 | 1,532
Refining and Marketing [Member] |  |
Disclosure of inventories [line items] |  |
Refining and Marketing | 613 | 874
Oil Sands [Member] |  |
Disclosure of inventories [line items] |  |
Crude Oil | 382 | 570
Conventional [Member] |  |
Disclosure of inventories [line items] |  |
Crude Oil | $ 1 | $ 1

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