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Equity-accounted investees (Narrative) (Details) - CAD ($) |  | 12 Months Ended
--- | --- | ---
Nov. 07, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2014
Joint Venture Inkai LLP [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Ownership interest in associates |  | 40.00% | 40.00% |
Non-ownership interest in associate |  | 60.00% |  |
Percent of joint venture results |  | 100.00% |  |
Westinghouse Electric Company [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Ownership stake | 49.00% | 49.00% | 49.00% |
Percent of optional ownership interest | 100.00% | 100.00% |  |
Westinghouse Electric Company [Member] | Brookfield Renewable Partners [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Ownership stake | 51.00% |  |  |
Global Laser Enrichment LLC [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Ownership interest in associates |  | 49.00% |  |
Percent of optional ownership interest |  | 75.00% |  |
Impairment loss |  |  |  | $ 183,615,000

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