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Income Taxes (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Income Tax [Line Items] |  |  |
Cash outflow from income taxes, plus investment credits earned | 811 imo_CashOutflowFromIncomeTaxesPlusInvestmentTaxCredit | 911 imo_CashOutflowFromIncomeTaxesPlusInvestmentTaxCredit | 871 imo_CashOutflowFromIncomeTaxesPlusInvestmentTaxCredit

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- Definition Net cash outflow resulting from current and deferred income tax expenses, plus investment tax credits earned. + References No definition available. + Details
Name: | imo_CashOutflowFromIncomeTaxesPlusInvestmentTaxCredit
Namespace Prefix: | imo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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