XML 85 R51.htm IDEA: XBRL DOCUMENT v3.20.4

Risk management - Schedule of Financial Instruments Outstanding (Detail) - Nov 2020 - Mar 2021 - AECO Swaps [Member]	9 Months Ended
	Sep. 30, 2020 $ / Mcf Mcf / d
Disclosure of detailed information about financial instruments [line items]
Financial instruments, notional volume | Mcf / d	23,700
Financial instruments, remaining term, description	Nov 2020 - Mar 2021
Financial instruments, benchmark pricing per unit | $ / Mcf	2.94

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

X

- Definition

Financial instruments benchmark pricing per unit.

+ References

No definition available.

+ Details

Name:	obe_FinancialInstrumentsBenchmarkPricingPerUnit
Namespace Prefix:	obe_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Financial instruments notional volume.

+ References

No definition available.

+ Details

Name:	obe_FinancialInstrumentsNotionalVolume
Namespace Prefix:	obe_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Financial instruments, remaining term, description

+ References

No definition available.

+ Details

Name:	obe_FinancialInstrumentsRemainingTermDescription
Namespace Prefix:	obe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ContractDurationAxis=obe_RemainingPeriodNovemberTwoThousandThirtyToMarchTwoThousandThirtyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=obe_AecoSwapsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: