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INCOME TAX EXPENSE AND DEFERRED TAXES - Income tax rates applicable in each jurisdiction where the Company operates (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Chile      
Income tax rates      
Applicable rate 27.00% 27.00% 27.00%
Brazil      
Income tax rates      
Applicable rate 34.00% 34.00% 34.00%
Argentina      
Income tax rates      
Applicable rate 30.00% 30.00% 30.00%
Paraguay      
Income tax rates      
Applicable rate 10.00% 10.00% 10.00%