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Group entities (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure Of Significant Investments In Subsidiaries [Abstract]  
Ownership interest in subsidiaries
Principal place Ownership interest
of business20182017
Subsidiaries:
Cameco Fuel Manufacturing Inc.Canada100%100%
Cameco Marketing Inc.Canada100%-
Cameco Inc.US100%100%
Power Resources, Inc.US100%100%
Crow Butte Resources, Inc.US100%100%
NUKEM, Inc.US100%-
NUKEM Investments GmbHGermany100%100%
Cameco Australia Pty. Ltd.Australia100%100%
Cameco Europe Ltd.Switzerland100%100%
Associates:
JV InkaiKazakhstan40%60%