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Common Shares - Additional Information (Detail) - shares	Jun. 27, 2019	Jun. 13, 2019
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

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No definition available.

+ Details

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X

- Definition

Percentage of Shares to Be Repurchased

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No definition available.

+ Details

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Namespace Prefix:	imo_
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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.

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No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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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.

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No definition available.

+ Details

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X

- 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.

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No definition available.

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