XML 82 R48.htm IDEA: XBRL DOCUMENT
v3.20.4

Provisions - Summary of Changes to Office Lease Provision (Detail) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Disclosure of Provisions [line items] |  |
Balance, beginning of year | $ 13 | $ 22
Net additions (dispositions) | 26 | (5)
Increase (decrease) due to changes in estimates | 1 | (3)
Cash settlements | (7) | (2)
Accretion charges | 2 | 1
Balance, end of year | 35 | 13
Current portion | 9 | 3
Long-term portion | $ 26 | $ 10

X
- Definition Current office lease provision. + References No definition available. + Details
Name: | obe_CurrentOfficeLeaseProvision
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Decrease in office lease provision net additions due to changes in estimates. + References No definition available. + Details
Name: | obe_DecreaseInOfficeLeaseProvisionNetAdditionsDueToChangesInEstimates
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Disclosure of provisions line items. + References No definition available. + Details
Name: | obe_DisclosureOfProvisionsLineItems
Namespace Prefix: | obe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Noncurrent office lease provision. + References No definition available. + Details
Name: | obe_NoncurrentOfficeLeaseProvision
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Office lease provision. + References No definition available. + Details
Name: | obe_OfficeLeaseProvision
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Office lease provision accretion charges. + References No definition available. + Details
Name: | obe_OfficeLeaseProvisionAccretionCharges
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Office lease provision cash settlements. + References No definition available. + Details
Name: | obe_OfficeLeaseProvisionCashSettlements
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Office lease provision net additions dispositions. + References No definition available. + Details
Name: | obe_OfficeLeaseProvisionNetAdditionsDispositions
Namespace Prefix: | obe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration