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BASIS OF PREPARATION OF CONSOLIDATED FINANCIAL STATEMENTS AND APPLICATION OF ACCOUNTING CRITERIA - Impairment of non-financial assets (Details) - CLP ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Impairment of non-financial assets    
Reduction in book value of assets $ 1,451  
Argentina    
Impairment of non-financial assets    
Discount rates 28.10% 35.30%
Chile    
Impairment of non-financial assets    
Discount rates 7.20% 8.50%
Brazil    
Impairment of non-financial assets    
Discount rates 9.90% 11.40%
Paraguay    
Impairment of non-financial assets    
Discount rates 9.30% 11.50%
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 5.00%  
Minimum | More than 5 years    
Impairment of non-financial assets    
Growth rate used to extrapolate cash flow projections 1.00%