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ACCOUNTING POLICIES (Impairment) (Details)
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Disclosure of impairment loss and reversal of impairment loss [line items]      
Discount rate used in current estimate of value in use 8.87%    
Cash-generating units      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Discount rate used in current estimate of value in use 8.87%   9.80%
Argentina | Subsidiaries      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Discount rate used in current estimate of value in use   14.30% 14.30%
Brazil | Subsidiaries      
Disclosure of impairment loss and reversal of impairment loss [line items]      
Discount rate used in current estimate of value in use   10.30%