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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 36,231imo_OperatingRevenuesIncludingFederalExciseTax [1],[2],[3] 32,722imo_OperatingRevenuesIncludingFederalExciseTax [1],[2],[3] 31,053imo_OperatingRevenuesIncludingFederalExciseTax [1],[2],[3]
Charges related to conversion of refinery to terminal   377us-gaap_RestructuringCharges  
Charges related to conversion of refinery to terminal, after tax   280imo_RestructuringChargesNetOfTax  
Write-down of refinery plant and equipment reported as depreciation and depletion expenses   245us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf  
Decommissioning, environmental and employee-related costs reported as production and manufacturing expenses   132us-gaap_OtherRestructuringCosts  
Amount incurred related to decommissioning, environmental and employee related cost 90us-gaap_PaymentsForRemovalCosts    
Property plant and equipment under construction 12,535us-gaap_ConstructionInProgressGross 9,234us-gaap_ConstructionInProgressGross  
United States Exports      
Segment Reporting Information [Line Items]      
Operating revenues 5,940imo_OperatingRevenuesIncludingFederalExciseTax
/ us-gaap_StatementGeographicalAxis
= country_US		 5,217imo_OperatingRevenuesIncludingFederalExciseTax
/ us-gaap_StatementGeographicalAxis
= country_US		 4,358imo_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.