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Property, plant and equipment - Summary of Right of Use Assets (Detail) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | $ 26 |
Ending balance | 11 | $ 26
Accumulated depletion, depreciation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | (10) |
Amortization | 5 | 10
Additions (Terminations) | (3) |
Ending balance | (12) | (10)
Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 36 | 37
Additions (Terminations) | (13) | (1)
Ending balance | 23 | 36
Office equipment | Accumulated depletion, depreciation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | (3) |
Amortization |  | 3
Additions (Terminations) | (3) |
Ending balance |  | (3)
Office equipment | Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 13 | 15
Additions (Terminations) | (13) | (2)
Ending balance |  | 13
Transportation [member] | Accumulated depletion, depreciation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | (6) |
Amortization | 4 | 6
Ending balance | (10) | (6)
Transportation [member] | Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 17 | 17
Additions (Terminations) | (2) |
Ending balance | 15 | 17
Vehicles | Accumulated depletion, depreciation and impairment [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | (1) |
Amortization | 1 | 1
Ending balance | (2) | (1)
Vehicles | Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 4 | 3
Additions (Terminations) | 2 | 1
Ending balance | 6 | 4
Surface [member] | Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Beginning balance | 2 | 2
Ending balance | $ 2 | $ 2

X
- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Increase decreasethrough termination of right of use assets. + References No definition available. + Details
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Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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