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

X

- 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

X

- Details

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