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Cash and cash equivalents (Details 2) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Cash and Cash Equivalents [Line Items]      
Long-term deposits $ 4,356,420 $ 46,723,278 $ 4,804,224
Banco de Chile Due On January 30 2019 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Deposits monthly interest rate   0.29%  
CLP [Member] | Banco de Chile Due On January 09 2019 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-24-2018  
Due date of deposits   01-09-2019  
Deposits monthly interest rate   0.21%  
Long-term deposits   $ 1,250,613  
CLP [Member] | Banco Santander Chile Due On January 10 2019 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-18-2018  
Due date of deposits   01-10-2019  
Deposits monthly interest rate   0.25%  
Long-term deposits   $ 2,803,033  
CLP [Member] | Banco Santander Chile1 Due On January 10 2019 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-19-2018  
Due date of deposits   01-10-2019  
Deposits monthly interest rate   0.26%  
Long-term deposits   $ 10,010,400  
CLP [Member] | Banco Santander Chile Due On January 24 2019 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-27-2018  
Due date of deposits   01-24-2019  
Deposits monthly interest rate   0.25%  
Long-term deposits   $ 10,003,333  
CLP [Member] | Banco de Chile Due On January 03 2020 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-27-2019    
Due date of deposits 01-03-2020    
Deposits monthly interest rate 0.12%    
Long-term deposits $ 2,450,392    
CLP [Member] | Banco Consorcio - Chile [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits     12-20-2017
Due date of deposits     01-03-2018
Deposits monthly interest rate     0.24%
Long-term deposits     $ 4,804,224
ARS [Member] | Banco Frances - Argentina [Member] | Banco Frances - Argentina Due On March 07, 2019      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-07-2018  
Due date of deposits   03-07-2019  
Deposits monthly interest rate   0.53%  
Long-term deposits   $ 5,921,330  
ARS [Member] | Banco Frances - Argentina [Member] | Banco Frances - Argentina Due On March 12, 2019      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-12-2018  
Due date of deposits   03-12-2019  
Deposits monthly interest rate   0.50%  
Long-term deposits   $ 5,110,766  
ARS [Member] | Banco Frances - Argentina [Member] | Banco Itau - Argentina Due On January 07, 2019      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   11-07-2018  
Due date of deposits   01-07-2019  
Deposits monthly interest rate   0.58%  
Long-term deposits   $ 6,013,947  
ARS [Member] | HSBC Bank Chile [Member] | Banco HSBC - Argentina Due On March 12, 2019      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-12-2018  
Due date of deposits   03-12-2019  
Deposits monthly interest rate   0.50%  
Long-term deposits   $ 4,921,479  
USD [Member] | Banco de Chile Due On January 30 2019 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-21-2018  
Due date of deposits   01-30-2019  
Long-term deposits   $ 486,812  
USD [Member] | Banco de Chile Due On January 25 2019 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-26-2018  
Due date of deposits   01-25-2019  
Deposits monthly interest rate   0.27%  
Long-term deposits   $ 139,017  
USD [Member] | Banco de Chile1 Due On January 25 2019 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits   12-27-2018  
Due date of deposits   01-25-2019  
Deposits monthly interest rate   0.23%  
Long-term deposits   $ 62,548  
USD [Member] | Banco de Chile Due On January 09 2020 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-27-2019    
Due date of deposits 01-09-2020    
Deposits monthly interest rate 0.12%    
Long-term deposits $ 1,108,307    
USD [Member] | Banco de Chile Due On January 10 2020 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-20-2019    
Due date of deposits 01-10-2020    
Deposits monthly interest rate 0.12%    
Long-term deposits $ 486,897    
USD [Member] | Banco de Chile Due On January 06 2020 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-23-2019    
Due date of deposits 01-06-2020    
Deposits monthly interest rate 0.12%    
Long-term deposits $ 310,824