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Share capital (Details)
 12 Months Ended
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2023
shares
$ / shares
Number of issued shares [Line Items]    
Common shares par value no  
Beginning of year 434,175,752 432,518,470
Stock option plan 1,136,331 1,657,282
End of year 435,312,083 434,175,752
Dividends Paid Ordinary Shares Per Share | $ / shares $ 0.16 $ 0.12
Common shares [Member]    
Number of issued shares [Line Items]    
Class B share preferences no shareholder, resident in Canada, is allowed to own more than 25% of the Company’s outstanding common shares, either individually or together with associates. A non-resident of Canada is not allowed to own more than 15%. In addition, no more than 25% of total shareholder votes cast may be cast by non-resident shareholders.  
Common shares [Member] | Share Holder Resident [Member] | Maximum [Member]    
Number of issued shares [Line Items]    
Ownership in Cameco 25.00% 25.00%
Common shares [Member] | Share Holder Non-Resident [Member] | Maximum [Member]    
Number of issued shares [Line Items]    
Ownership in Cameco 15.00% 15.00%
Percentage Votes Of Ordinary Shares Of Company 25.00% 25.00%
Class B Shares [Member]    
Number of issued shares [Line Items]    
Class B share par value | $ / shares $ 1  
Class B share preferences entitles the shareholder to vote separately as a class in respect of any proposal to locate the head office of Cameco to a place not in the province of Saskatchewan