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Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) (Reclassification Adjustment out of Accumulated Other Comprehensive Income, CAD) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amortization of post-retirement benefits liability adjustment included in net periodic benefit cost | (196)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = imo_AccumulatedDefinedBenefitPlansAdjustmentBeforeTaxMember | [1] | (276)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = imo_AccumulatedDefinedBenefitPlansAdjustmentBeforeTaxMember | [1] | (266)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / us-gaap_StatementEquityComponentsAxis = imo_AccumulatedDefinedBenefitPlansAdjustmentBeforeTaxMember | [1]
[1] | This accumulated other comprehensive income component is included in the computation of net periodic benefit cost (note 4).

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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References No definition available. + Details
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