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Share Capital (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Number of issued shares [Line Items] |  |
Beginning of year | 395,797,732 | 395,792,732
Stock option plan | 465,009 | 5,000
End of year | 396,262,741 | 395,797,732
Common shares [member] |  |
Number of issued shares [Line Items] |  |
Common shares par value | no |
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 | $ 0.08 | $ 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 |

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