XML 174 R129.htm IDEA: XBRL DOCUMENT
v3.20.4

Decommissioning Liabilities - Additional Information (Detail) - CAD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Other Provisions [Line Items] |  |
Estimated future cash flows required to settle the obligation | $ 4,953,000,000 | $ 5,173,000,000
Credit-adjusted risk-free rate | 5.00% | 4.90%
Inflation Rate | 2.00% | 2.00%
Bottom of Range [Member] |  |
Disclosure Of Other Provisions [Line Items] |  |
Settlement Of Decommissioning Liabilities | $ 40,000,000 |
Top of Range [Member] |  |
Disclosure Of Other Provisions [Line Items] |  |
Settlement Of Decommissioning Liabilities | $ 45,000,000 |

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

X
- Definition Expected outflows for next year other provisions. + References No definition available. + Details
Name: | cve_ExpectedOutflowsOtherProvisionsNextYear
Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Rate of inflation applied to expected future cash flows. + References No definition available. + Details
Name: | cve_InflationRate
Namespace Prefix: | cve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Undiscounted cash outflow required to settle obligation. + References No definition available. + Details
Name: | cve_UndiscountedCashOutflowRequiredToSettleObligation
Namespace Prefix: | cve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfOtherProvisionsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |