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Long Term Debt (Parenthetical) (Detail) (CAD)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Maximum long-term borrowing from affiliate 6,250,000,000imo_Maximumlongtermborrowingfromaffiliate  
Cancellation period long-term borrowing from affiliate, days 370 days  
Average effective rate for affiliate long-term borrowing 1.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage  
Capitalized lease obligations for marine services, average imputed rate 7.00%imo_Capitalizedleaseobligationaverageimputedrate 7.00%imo_Capitalizedleaseobligationaverageimputedrate
Total capitalized lease obligations in current liabilities 22,000,000us-gaap_CapitalLeaseObligationsCurrent 7,000,000us-gaap_CapitalLeaseObligationsCurrent
Principal payments on capital leases, in two years 19,000,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears  
Principal payments on capital leases, in three years 19,000,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears  
Principal payments on capital leases, in four years 19,000,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears  
Principal payments on capital leases, in five years 19,000,000us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears