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v3.20.4

Share-based compensation - Summary of Share-Based Compensation (Detail) - CAD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share-based compensation | $ 2 | $ 3
Restricted share unit plan [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share-based compensation | $ 2 | $ 3

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

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- Definition Share based compensation arrangements. + References No definition available. + Details
Name: | obe_ShareBasedCompensationArrangements
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=obe_RestrictedShareUnitPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |