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Segmented information (Narrative 2) (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of major customers [line items] |  |
Revenue | $ 1,868,003,000 | $ 1,474,984,000
Major customer(s) of Cameco's uranium and fuel services segments [member] |  |
Disclosure of major customers [line items] |  |
Revenue | $ 227,846,000 | $ 166,068,000
Percentage of entity's revenue | 12.00% | 11.00%
Information about major customers | As customers are relatively few in number, accounts receivable from any individual customer may periodically exceed 10% of accounts receivable depending on delivery schedule. |

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