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Gains and Losses on Asset Sales (Detail) (CAD)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investment And Other Income [Line Items]      
Proceeds from asset sales 851us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 160us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 226us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Book value of assets sold 155imo_BookValueOfAssetsSold 10imo_BookValueOfAssetsSold 132imo_BookValueOfAssetsSold
Gain/(loss) on asset sales, before tax 696us-gaap_GainLossOnDispositionOfAssets1 [1],[2] 150us-gaap_GainLossOnDispositionOfAssets1 [1],[2] 94us-gaap_GainLossOnDispositionOfAssets1 [1],[2]
Gain/(loss) on asset sales, after tax 526imo_NetGainLossOnAssetSalesAfterTax [1],[2] 120imo_NetGainLossOnAssetSalesAfterTax [1],[2] 72imo_NetGainLossOnAssetSalesAfterTax [1],[2]
[1] 2014 included a gain of $638 million ($478 million, after tax) for the sale of the company's interest in producing conventional assets located in Boundary Lake, Cynthia/West Pembina and Rocky Mountain House.
[2] 2013 included a gain of $85 million ($73 million, after tax) for the sale of non-operating assets.