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BASIS OF PREPARATION OF CONSOLIDATED FINANCIAL STATEMENTS AND APPLICATION OF ACCOUNTING CRITERIA - Impairment of non-financial assets (Details)
Dec. 31, 2019
Dec. 31, 2018
Argentina    
Impairment of non-financial assets    
Discount rates 35.30% 21.20%
Chile    
Impairment of non-financial assets    
Discount rates 8.50% 8.10%
Brazil    
Impairment of non-financial assets    
Discount rates 11.40% 10.90%
Paraguay    
Impairment of non-financial assets    
Discount rates 11.50% 10.10%
Maximum    
Impairment of non-financial assets    
Growth rate used to extrapolate cash flow projections 7.00%  
Maximum | More than 5 years    
Impairment of non-financial assets    
Growth rate used to extrapolate cash flow projections 2.50%  
Minimum    
Impairment of non-financial assets    
Growth rate used to extrapolate cash flow projections 3.00%  
Minimum | More than 5 years    
Impairment of non-financial assets    
Growth rate used to extrapolate cash flow projections 1.00%