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

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- 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

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- Details
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Namespace Prefix: | imo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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 + Details
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Period Type: | instant