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Common Shares - Additional Information (Detail) - CAD ($) $ in Millions	Jun. 29, 2021	Jun. 15, 2021	Apr. 29, 2022
Class of Stock [Line Items]
Normal course issuer bid share repurchase shares authorized	35,583,671
Exxon Mobil Corporation's ownership interest in Imperial	69.60%
Normal course issuer bid share repurchase term, months	12 months
Percent of total shares		(5.00%)
Subsequent Event [Member]
Class of Stock [Line Items]
Substantial stock repurchase program common stock subject to repurchase and cancellation amount			$ 2,500
Exxon Mobil Corporation's ownership interest in Imperial			69.60%

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Majority interest ownership percentage

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Percentage of total number of common shares.

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- Definition

Substantial stock repurchase program common stock subject to repurchase and cancellation amount.

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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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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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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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