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Summary of Assets Acquired and Liabilities Assumed (Detail) (CAD)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Feb. 26, 2013
Business Acquisition [Line Items]      
Goodwill 224us-gaap_Goodwill 224us-gaap_Goodwill  
Celtic      
Business Acquisition [Line Items]      
Current assets     49us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember
Property, plant and equipment     2,045us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember		 [1]
Goodwill     20us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember		 [2]
Total assets acquired     2,114us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember
Current liabilities     62us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember
Deferred income tax liabilities     377us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember		 [3]
Other long-term obligations     67us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember
Total liabilities assumed     506us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember
Net assets acquired     1,608us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= imo_CelticExplorationLtdMember
[1] Property, plant and equipment were measured primarily using an income approach. The fair value measurements of the oil and gas assets were based, in part, on significant inputs not observable in the market and thus represent a Level 3 measurement. The significant inputs included Celtic resources, assumed future production profiles, commodity prices (mainly based on observable market inputs), risk adjusted discount rate of 10 percent, inflation of 2 percent and assumptions on the timing and amount of future development and operating costs. The property, plant and equipment additions were segmented to the Upstream business, with all of the assets in Canada.
[2] Goodwill was the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Goodwill was recognized in the Upstream reporting unit. Goodwill is not amortized and is not deductible for tax purposes.
[3] Deferred income taxes reflect the future tax consequences on the temporary differences between the amount of assets and liabilities recognized for financial reporting purposes and such amounts recognized for tax purposes.