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Group entities (Ownership interest in subsidiaries) (Details) |  | 12 Months Ended
--- | --- | ---
Nov. 07, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Joint Venture Inkai LLP [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in associates |  | 40.00% | 40.00%
Principal place of business of associate |  | Kazakhstan |
Watt New Aggregator L.P. (Westinghouse) [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in joint venture | 49.00% | 49.00% | 49.00%
Principal place of business of joint venture |  | US |
Cameco Fuel Manufacturing Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in subsidiaries |  | 100.00% | 100.00%
Principal place of business of subsidiary |  | Canada |
Cameco Marketing Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in subsidiaries |  | 100.00% | 100.00%
Principal place of business of subsidiary |  | Canada |
Cameco Inc. [member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in subsidiaries |  | 100.00% | 100.00%
Principal place of business of subsidiary |  | US |
Power Resources, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in subsidiaries |  | 100.00% | 100.00%
Principal place of business of subsidiary |  | US |
Crow Butte Resources, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in subsidiaries |  | 100.00% | 100.00%
Principal place of business of subsidiary |  | US |
Cameco U.S. Holdings, Inc. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in subsidiaries |  | 100.00% | 100.00%
Principal place of business of subsidiary |  | US |
Cameco Australia Pty. Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in subsidiaries |  | 100.00% | 100.00%
Principal place of business of subsidiary |  | Australia |
Cameco Europe Ltd. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Ownership interest in subsidiaries |  | 100.00% | 100.00%
Principal place of business of subsidiary |  | Switzerland |

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