XML 167 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document and Entity Information
 12 Months Ended
Dec. 31, 2019
shares
Document And Entity Information [Abstract]  
Document Type 40-F
Amendment Flag false
Document Period End Date Dec. 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Entity Registrant Name Cameco Corporation
Entity Central Index Key 0001009001
Entity Address, Address Line One 2121 – 11th Street West
Entity Address City or Town Saskatoon
Entity Address State Or Province SK
Entity Address, Postal Zip Code S7M 1J3
Entity Address Country CA
Current Fiscal Year End Date --12-31
Entity Current Reporting Status Yes
Entity Common Stock, Shares Outstanding 395,797,732
Entity Emerging Growth Company false
Entity Interactive Data Current Yes