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Common shares - Narrative (Detail) - Normal Course Issuer Bid Effective From June Twenty Ninth Two Thousand And Twenty Five - shares | Jun. 29, 2025 | Jun. 15, 2025
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Class of Stock [Line Items] |  |
Normal course issuer bid share repurchase term, months | 12 months |
Normal course issuer bid share repurchase shares authorized | 25,452,248 |
Percent of total shares |  | 5.00%
Exxon Mobil Corporation |  |
Class of Stock [Line Items] |  |
Exxon Mobil Corporation's ownership interest in Imperial | 69.60% |

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