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Common Shares - Additional Information (Detail) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Class of Stock [Line Items] |
Normal course issuer bid share repurchase shares authorized | 1
Normal course issuer bid share repurchase programs | 18
Normal course issuer bid share repurchase term, months | 12 months
Exxon Mobil Corporation's ownership interest in Imperial | 69.60%

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- Definition Majority interest ownership percentage + References No definition available. + Details
Name: | imo_MajorityInterestOwnershipPercentage
Namespace Prefix: | imo_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of 12 month bid share repurchase programs undertaken, since 1995. + References No definition available. + Details
Name: | imo_NormalCourseIssuerBidShareRepurchasePrograms
Namespace Prefix: | imo_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramPeriodInForce1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration