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Business Segments (Parenthetical) (Detail) (CAD) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 36,231 imo_OperatingRevenuesIncludingFederalExciseTax | [1],[2],[3] | 32,722 imo_OperatingRevenuesIncludingFederalExciseTax | [1],[2],[3] | 31,053 imo_OperatingRevenuesIncludingFederalExciseTax | [1],[2],[3]
Charges related to conversion of refinery to terminal |  |  | 377 us-gaap_RestructuringCharges |  |  |
Charges related to conversion of refinery to terminal, after tax |  |  | 280 imo_RestructuringChargesNetOfTax |  |  |
Write-down of refinery plant and equipment reported as depreciation and depletion expenses |  |  | 245 us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |  |
Decommissioning, environmental and employee-related costs reported as production and manufacturing expenses |  |  | 132 us-gaap_OtherRestructuringCosts |  |  |
Amount incurred related to decommissioning, environmental and employee related cost | 90 us-gaap_PaymentsForRemovalCosts |  |  |  |  |
Property plant and equipment under construction | 12,535 us-gaap_ConstructionInProgressGross |  | 9,234 us-gaap_ConstructionInProgressGross |  |  |
United States Exports |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 5,940 imo_OperatingRevenuesIncludingFederalExciseTax / us-gaap_StatementGeographicalAxis = country_US |  | 5,217 imo_OperatingRevenuesIncludingFederalExciseTax / us-gaap_StatementGeographicalAxis = country_US |  | 4,358 imo_OperatingRevenuesIncludingFederalExciseTax / us-gaap_StatementGeographicalAxis = country_US |
[1] | Operating revenues include federal excise tax of $1,562 million (2013 - $1,423 million, 2012 - $1,338 million).
[2] | Operating revenues include amounts from related parties of $3,752 million (2013 - $2,385 million, 2012 - $2,907 million), (note 16).
[3] | Includes export sales to the United States of $5,940 million (2013 - $5,217 million, 2012 - $4,358 million). Export sales to the United States were recorded in all operating segments, with the largest effects in the Upstream segment.

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- Definition Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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