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Transaction With related Parties - Additional Information (Detail) (CAD) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Long-Term Loans |  |
Related Party Transaction [Line Items] |  |
Outstanding loans from an affiliate | 4,316 | 1,040
Short-Term Loans |  |
Related Party Transaction [Line Items] |  |
Outstanding loans from an affiliate | 75 |

X
- Definition Outstanding loans from an affiliate, includes both current and noncurrent portion. + References No definition available. + Details
Name: | imo_OutstandingLoansFromAffiliate
Namespace Prefix: | imo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration