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Income taxes (Details) - CLP ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
IncomeTaxes [Line Items]    
Current tax assets, current $ 10,865,347 $ 15,132,290
Refundable tax previous year    
IncomeTaxes [Line Items]    
Current tax assets, current 3,911,803 5,484,216
Argentinean tax credits [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 3,200,454 1,140,073
Monthly provisions [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 3,498,109 8,136,478
Payment of absorbed profit provision [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 1,154 4,830
Other credits [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current $ 253,827 $ 366,693