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ACCOUNTING POLICIES (Impairment) (Details)
Dec. 31, 2018
Dec. 31, 2017
Disclosure of impairment loss and reversal of impairment loss [line items]    
Discount rate used in current estimate of value in use 11.68%  
Cash-generating units    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Discount rate used in current estimate of value in use 11.68% 11.49%
Argentina | Subsidiaries    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Discount rate used in current estimate of value in use 13.50%