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Income taxes (Details) - CLP ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
IncomeTaxes [Line Items]    
Current tax assets, current $ 15,132,290 $ 17,302,429
Refundable tax previous year    
IncomeTaxes [Line Items]    
Current tax assets, current 5,484,216 11,884,421
Taxes under claim [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current [1] 0 968,195
Argentinean tax credits [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 1,140,073 440,172
Monthly provisions [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 8,136,478 3,686,905
Payment of absorbed profit provision [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 4,830 0
Other credits [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current $ 366,693 $ 322,736
[1] This item includes claims for refund of first category taxes (Provisional payment of absorbed profit) for an amount of ThCh$ 968,195 as of December 31, 2018, that was presented in April 2014 from the commercial year 2013, which was recovered the second quarter of 2019.