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Gains and Losses on Asset Sales (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Investment And Other Income [Line Items] |  |  |  |  |  |
Gain/(loss) on asset sales, before tax | 696 us-gaap_GainLossOnDispositionOfAssets1 | [1],[2] | 150 us-gaap_GainLossOnDispositionOfAssets1 | [1],[2] | 94 us-gaap_GainLossOnDispositionOfAssets1 | [1],[2]
Gain/(loss) on asset sales, after tax | 526 imo_NetGainLossOnAssetSalesAfterTax | [1],[2] | 120 imo_NetGainLossOnAssetSalesAfterTax | [1],[2] | 72 imo_NetGainLossOnAssetSalesAfterTax | [1],[2]
Conventional Assets |  |  |  |  |  |
Investment And Other Income [Line Items] |  |  |  |  |  |
Gain/(loss) on asset sales, before tax | 638 us-gaap_GainLossOnDispositionOfAssets1 / us-gaap_PropertyPlantAndEquipmentByTypeAxis = imo_ConventionalAssetsMember |  |  |  |  |
Gain/(loss) on asset sales, after tax | 478 imo_NetGainLossOnAssetSalesAfterTax / us-gaap_PropertyPlantAndEquipmentByTypeAxis = imo_ConventionalAssetsMember |  |  |  |  |
Non-Operating Assets |  |  |  |  |  |
Investment And Other Income [Line Items] |  |  |  |  |  |
Gain/(loss) on asset sales, before tax | 85 us-gaap_GainLossOnDispositionOfAssets1 / us-gaap_PropertyPlantAndEquipmentByTypeAxis = imo_NonOperatingAssetsMember |  |  |  |  |
Gain/(loss) on asset sales, after tax | 73 imo_NetGainLossOnAssetSalesAfterTax / us-gaap_PropertyPlantAndEquipmentByTypeAxis = imo_NonOperatingAssetsMember |  |  |  |  |
[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.

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- Definition Net gain (loss) on asset sales, after tax. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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