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Income taxes (Details) - CLP ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
IncomeTaxes [Line Items]    
Current tax assets, current $ 29,201,159 $ 29,423,479
Refundable tax previous year    
IncomeTaxes [Line Items]    
Current tax assets, current 9,640,567 4,436,810
Taxes under claim [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current [1] 2,141,476 2,141,476
Argentinean tax credits [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 4,813,614 2,532,114
Monthly provisions [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 11,155,690 18,860,164
Payment of absorbed profit provision [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current 24,104 75,141
Other credits [Member]    
IncomeTaxes [Line Items]    
Current tax assets, current $ 1,425,708 $ 1,377,774
[1] This item includes claims for refund of first category taxes (Provisional payment of absorved profit) for an amount of ThCh$ 968,195 that was presented in April 2014 from the commercial year 2013 and claim to ThCh$ 1,173,281 presented in April 2010 from the commercial year 2009.