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Description of Business and Segmented Disclosures - Narrative (Detail) | 9 Months Ended
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Sep. 30, 2021 plant
Canadian Manufacturing | Downstream |
Disclosure of operating segments [line items] |
Number of ethanol plants | 2

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- Definition Number Of Ethanol Plants + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=cve_DownstreamMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |