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Common Shares - Additional Information (Detail) - shares | Jun. 27, 2019 | Jun. 13, 2019
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Class of Stock [Line Items] |  |
Normal course issuer bid share repurchase shares authorized | 38,211,086 |
Percent of total shares |  | 5.00%
Exxon Mobil Corporation's ownership interest in Imperial | 69.60% |
Normal course issuer bid share repurchase term, months | 12 months |

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- Definition Majority interest ownership percentage + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Percentage of Shares to Be Repurchased + References No definition available. + Details
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Namespace Prefix: | imo_
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Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- 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
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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
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Data Type: | xbrli:durationItemType
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