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Other Long-Term Obligations (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Other Liabilities [Line Items]
Employee retirement benefits obligations in current liabilities	58us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities	53us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities
Asset retirement obligations and other environmental liabilities in current liabilities	143imo_AssetRetirementObligationAndOtherEnvironmentalLiabilitiesCurrent	154imo_AssetRetirementObligationAndOtherEnvironmentalLiabilitiesCurrent

X

- Definition

Asset Retirement Obligation And Other Environmental Liabilities Current

+ References

No definition available.

+ Details

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Namespace Prefix:	imo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	imo_ScheduleOfOtherLiabilitiesLineItems
Namespace Prefix:	imo_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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