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Share Capital (Common shares issued) (Details) - CAD ($)
 12 Months Ended
Oct. 17, 2022
Dec. 31, 2022
Dec. 31, 2021
Number of issued shares [Line Items]      
Common shares par value   no  
Beginning of year   398,059,265 396,262,741
Stock option plan [note 25]   401,955 1,796,524
Equity issuance(a) 34,057,250 34,057,250 0
End of year   432,518,470 398,059,265
Total consideration $ 996,867,000    
Net cash proceeds 953,285,000 $ 953,285,000 $ 0
Proceeds from the issue after deducting expenses $ 964,878,000 $ 964,878,000  
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.  
Dividends Paid Ordinary Shares Per Share   $ 0.12 $ 0.08
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   $ 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