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Gains and Losses on Asset Sales (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] |  |  |  |  |  |
Proceeds from asset sales | 851 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  | 160 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  | 226 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |
Book value of assets sold | 155 imo_BookValueOfAssetsSold |  | 10 imo_BookValueOfAssetsSold |  | 132 imo_BookValueOfAssetsSold |
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]
[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 Book Value of Assets Sold + References No definition available. + Details
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- Details
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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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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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