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Group entities (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Significant Investments In Subsidiaries [Abstract] |
Ownership interest in subsidiaries |
|  | Principal place | Ownership interest
|  | of business | 2020 | 2019
Subsidiaries: |  |  |
| Cameco Fuel Manufacturing Inc. | Canada | 100% | 100%
| Cameco Marketing Inc. | Canada | 100% | 100%
| Cameco Inc. | US | 100% | 100%
| Power Resources, Inc. | US | 100% | 100%
| Crow Butte Resources, Inc. | US | 100% | 100%
| NUKEM, Inc. | US | 100% | 100%
| Cameco Australia Pty. Ltd. | Australia | 100% | 100%
| Cameco Europe Ltd. | Switzerland | 100% | 100%
Associates: |  |  |
| JV Inkai | Kazakhstan | 40% | 40%

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- Definition The disclosure of interests in subsidiaries. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph 2 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_2_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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