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Income taxes (Details 2) - CLP ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
IncomeTaxes [Line Items]    
Current tax liabilities, current $ 20,504,374 $ 75,885,449
Chilean income taxes    
IncomeTaxes [Line Items]    
Current tax liabilities, current   71,587,790
Chilean income taxes | CHILE    
IncomeTaxes [Line Items]    
Current tax liabilities, current 12,928,404  
Monthly provisional payments    
IncomeTaxes [Line Items]    
Current tax liabilities, current 6,133,335 3,946,196
Chilean Unique Taxes [Member]    
IncomeTaxes [Line Items]    
Current tax liabilities, current 165,936 101,474
Others    
IncomeTaxes [Line Items]    
Current tax liabilities, current $ 1,276,699 $ 249,989