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Inventory - Schedule of Inventory (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Inventories [Abstract] |  |
Product inventory | $ 535 | $ 390
Materials, supplies and other | 1,013 | 670
Total inventory | $ 1,548 | $ 1,060

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- Definition A classification of current inventory representing the amount of unrefined, unprocessed oil. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2021-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2021-en-r&anchor=para_37&doctype=Standard -URIDate 2021-03-24 + Details
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