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Commitments and Contingencies - Summary of Future Payments of Commitments (Parenthetical) (Detail) - CAD ($) $ in Billions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of commitments [Line Items] |  |
Transportation Commitment | $ 14 | $ 13
Transportation Commitment Term | 20 years | 20 years
WRB [Member] |  |
Disclosure of commitments [Line Items] |  |
Percent of ownership in joint operations | 50.00% | 50.00%

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- Definition Disclosure of commitments line items. + References No definition available. + Details
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Period Type: | duration

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- Definition Transportation commitments subject to regulatory approval or approved but not yet in service. + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
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- Definition Transportation commitments subject to regulatory approval or approved but not yet in service term. + References No definition available. + Details
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- Definition The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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