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Number of Projects with Suspended Exploratory Well Costs (Detail) | 12 Months Ended
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Dec. 31, 2014 Project | Dec. 31, 2013 Project | Dec. 31, 2012 Project
Exploratory Wells Drilled [Line Items] |  |  |
Number of projects with first capitalized well drilled in the preceding 12 months |  |  |
Number of projects that have exploratory well costs capitalized for a period of greater than 12 months | 1 us-gaap_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear | 1 us-gaap_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear | 1 us-gaap_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear
Total projects | 1 imo_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalized | 1 imo_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalized | 1 imo_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalized

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- Definition Number of projects with capitalized wells drilled in preceding twelve months. + References No definition available. + Details
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Namespace Prefix: | imo_
Data Type: | xbrli:integerItemType
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Period Type: | duration

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- Definition Projects that have Exploratory Well Costs that have been Capitalized + References No definition available. + Details
Name: | imo_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalized
Namespace Prefix: | imo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ExploratoryWellsDrilledLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph b -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447 + Details
Name: | us-gaap_ProjectsThatHaveExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant