XML 154 R109.htm IDEA: XBRL DOCUMENT
v3.20.4

Exploration and Evaluation Assets - Summary of Exploration and Valuation Assets (Parenthetical) (Detail) $ in Millions | Dec. 31, 2020 CAD ($)
--- | ---
Marten Hills Asset [Member] |
Disclosure Of Exploration And Evaluation Assets [Line Items] |
Gross overriding royalty | $ 41

X
- Definition Disclosure of exploration and evaluation assets line items. + References No definition available. + Details
Name: | cve_DisclosureOfExplorationAndEvaluationAssetsLineItems
Namespace Prefix: | cve_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross overriding royalty. + References No definition available. + Details
Name: | cve_GrossOverridingRoyalty
Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_ContinuingAndDiscontinuedOperationsAxis=cve_MartenHillsAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |