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Income taxes (Details 2) - CLP ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 12, 2017
IncomeTaxes [Line Items]      
Current tax liabilities, current $ 75,885,449 $ 22,526,634  
Chilean income taxes      
IncomeTaxes [Line Items]      
Current tax liabilities, current 71,587,790    
Chilean income taxes | CHILE      
IncomeTaxes [Line Items]      
Current tax liabilities, current   18,335,047  
Monthly provisional payments      
IncomeTaxes [Line Items]      
Current tax liabilities, current 3,946,196 3,970,511  
Chilean Unique Taxes [Member]      
IncomeTaxes [Line Items]      
Current tax liabilities, current 101,474 $ 105,903  
Others      
IncomeTaxes [Line Items]      
Current tax liabilities, current $ 249,989   $ 115,173