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v3.20.4

Long-term debt - Additional Information (Detail) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |
Percentage of long-term debt instruments exposed to changes in short-term interest rates | 86.00% | 87.00%
Letters of credit outstanding | $ 5 | $ 8
Syndicated credit facility [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Debt | 550 |
Available borrowing facilities | $ 450 |

X
- Definition The amount of instruments issued by the entity that represent indebtedness. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount available under borrowing facilities. + References No definition available. + Details
Name: | obe_AvailableBorrowingFacilities
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of credit facility amount. + References No definition available. + Details
Name: | obe_LineOfCreditFacilityAmount
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage of long term debt instruments exposed to changes in short term interest rates. + References No definition available. + Details
Name: | obe_PercentageOfLongTermDebtInstrumentsExposedToChangesInShortTermInterestRates
Namespace Prefix: | obe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |