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INTANGIBLE ASSETS AND GOODWILL - Main assumptions used in the annual test (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Main assumptions used in the annual test    
Conservative growth rate 3.00%  
Argentina operation    
Main assumptions used in the annual test    
Discount rate 21.20% 17.10%
Chile operation    
Main assumptions used in the annual test    
Discount rate 8.10% 7.20%
Brazil operation    
Main assumptions used in the annual test    
Discount rate 10.90% 9.60%
Paraguay operation    
Main assumptions used in the annual test    
Discount rate 10.10% 9.10%
Minimum    
Main assumptions used in the annual test    
Perpetuity growth rate 1.00%  
Maximum    
Main assumptions used in the annual test    
Conservative growth rate 7.00%  
Perpetuity growth rate 2.50%