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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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