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Property, Plant and Equipment, Net - Summary of PP&E Under Construction and Not Subject to DD&A (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Property Plant And Equipment [Line Items] |  |
Property Plant and Equipment Temporarily Idle | $ 2,033 | $ 2,008
Development & Production Upstream Assets [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property Plant and Equipment Temporarily Idle | 1,807 | 1,836
Refining Equipment [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Property Plant and Equipment Temporarily Idle | $ 226 | $ 172

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- Definition The amount of expenditures recognised in the carrying amount of an item of property, plant and equipment in the course of its construction. [Refer: Carrying amount [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 74 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_74_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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