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Decommissioning Liabilities - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Disclosure of credit risk exposure [line items] |  |  |
Credit-adjusted risk-free rate |  | 5.00% | 5.00%
Forecast |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Expected settlement of decommissioning liabilities | $ 150 |  |

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- Definition Credit adjusted risk free rate. + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Expected Outflows, Other Provisions Next Year + References No definition available. + Details
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Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |