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Cash and cash equivalents (Details 2) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Cash and Cash Equivalents [Line Items]      
Long-term deposits $ 106,109,299 $ 4,356,420 $ 46,723,278
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] | Scotia Bank Chile Due On February 23 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-26-2020    
Due date of deposits 02-23-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 4,928,234    
CLP [Member] | Scotia Bank Chile Due On February 24 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-26-2020    
Due date of deposits 02-24-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 5,074,166    
CLP [Member] | Scotia Bank Chile Due On February 15 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-16-2020    
Due date of deposits 02-15-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 7,972,555    
CLP [Member] | Scotia Bank Chile Due On March 24 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-24-2020    
Due date of deposits 03-24-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 40,040    
CLP [Member] | Banco Consorcio - Chile [Member] | Banco Consorcio Chile Due On January 11 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-30-2020    
Due date of deposits 01-11-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 1,199,904    
CLP [Member] | Banco Bice Chile Member [Member] | Banco Bice Chile Due On January 18 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-30-2020    
Due date of deposits 01-18-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 599,924    
CLP [Member] | Banco Bice Chile Member [Member] | Banco Bice Chile Due On February 16 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-01-2020    
Due date of deposits 02-16-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 500,562    
CLP [Member] | Banco Bice Chile Member [Member] | Banoc Bice Chile Due On January 05 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-21-2020    
Due date of deposits 01-05-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 171,656    
CLP [Member] | Banco de Chile [Member] | Banco De Chile Due On February 22 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-30-2020    
Due date of deposits 02-22-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 1,036,848    
CLP [Member] | Banco de Chile [Member] | Banco De Chile Due On January 20 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-30-2020    
Due date of deposits 01-20-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 599,916    
CLP [Member] | Banco de Chile [Member] | Banco De Chile Due On January 05 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-29-2020    
Due date of deposits 01-05-2021    
Deposits monthly interest rate 0.01%    
Long-term deposits $ 2,750,018    
CLP [Member] | Banco De Credit Inversiones Chile [Member] | Banco De Credit Inversiones Due On January 07 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-03-2020    
Due date of deposits 01-07-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 4,001,080    
CLP [Member] | Banco De Credit Inversiones Chile [Member] | Banco De Credit Inversiones Due On January 12 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-03-2020    
Due date of deposits 01-12-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 2,970,653    
CLP [Member] | Banco De Credit Inversiones Chile [Member] | Banco De Credit Inversiones Due On February 02 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-04-2020    
Due date of deposits 02-02-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 3,035,095    
CLP [Member] | Banco De Credit Inversiones Chile [Member] | Banco De Credit Inversiones Due On February 09 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-11-2020    
Due date of deposits 02-09-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 4,005,434    
CLP [Member] | Banco De Credit Inversiones Chile [Member] | Banco De Credit Inversiones Due On February 19 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-11-2020    
Due date of deposits 02-19-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 4,000,760    
CLP [Member] | Banco del Estado de Chile [Member] | Banco Del Estado De Chile Due On January 07 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-01-2020    
Due date of deposits 01-07-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 349,981    
CLP [Member] | Banco del Estado de Chile [Member] | Banco Del Estado De Chile Due On January 07 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-01-2020    
Due date of deposits 01-07-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 1,599,915    
CLP [Member] | Banco del Estado de Chile [Member] | Banco Del Estado De Chile Due On January 07 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-01-2020    
Due date of deposits 01-07-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 150,770    
CLP [Member] | Banco del Estado de Chile [Member] | Banco Del Estado De Chile Due On March 02 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-02-2020    
Due date of deposits 03-02-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 3,203,525    
CLP [Member] | Banco del Estado de Chile [Member] | Banco Del Estado De Chile Due On March 12 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-14-2020    
Due date of deposits 03-12-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 2,998,561    
CLP [Member] | Banco del Estado de Chile [Member] | Banco Del Estado De Chile Due On January 07 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-28-2020    
Due date of deposits 01-07-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 599,968    
CLP [Member] | Banco del Estado de Chile [Member] | Banco Del Estado De Chile Due On January 04 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-28-2020    
Due date of deposits 01-04-2021    
Deposits monthly interest rate 0.01%    
Long-term deposits $ 5,160,074    
CLP [Member] | Banco Itau Chile [Member] | Banco Itau Chile Due On March 18 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-18-2020    
Due date of deposits 03-18-2021    
Deposits monthly interest rate 0.04%    
Long-term deposits $ 5,003,388    
CLP [Member] | Banco Itau Chile [Member] | Banco Itau Chile Due On February 19 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-22-2020    
Due date of deposits 02-19-2021    
Deposits monthly interest rate 0.04%    
Long-term deposits $ 4,002,133    
CLP [Member] | Banco Santander Chile [Member] | Banco Santander Chile Due On January 21 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 10-23-2020    
Due date of deposits 01-21-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 3,002,365    
CLP [Member] | Banco Santander Chile [Member] | Banco Santander Chile Due On January 11 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-26-2020    
Due date of deposits 01-11-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 5,001,133    
CLP [Member] | Banco Santander Chile [Member] | Banco Santander Chile Due On January 25 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-26-2020    
Due date of deposits 01-25-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 5,001,133    
CLP [Member] | Banco Santander Chile [Member] | Banco Santander Chile Due On Februrary 02 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-04-2020    
Due date of deposits 02-02-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 5,000,867    
CLP [Member] | Banco Security Chile [Member] | Banco Security Chile Due On January 22 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 11-26-2020    
Due date of deposits 01-22-2021    
Deposits monthly interest rate 0.02%    
Long-term deposits $ 5,001,133    
CLP [Member] | Banco Security Chile [Member] | Banco Security Chile Due On March 29 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-29-2020    
Due date of deposits 03-29-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 3,953,938    
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 Itaú - 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
ARS [Member] | Banco Galica [Member] | Banco Galica Due Due On January 21 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-22-2020    
Due date of deposits 01-21-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 4,264,230    
ARS [Member] | Banco Patagonia [Member] | Banco Patagonia Due On January 11 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-11-2020    
Due date of deposits 01-11-2021    
Deposits monthly interest rate 0.03%    
Long-term deposits $ 4,308,152    
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  
USD [Member] | Banco de Chile [Member] | Banco De Chile Due On January 05 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-29-2020    
Due date of deposits 01-05-2021    
Deposits monthly interest rate 0.05%    
Long-term deposits $ 3,554,760    
USD [Member] | Banco de Chile [Member] | Banco De Chile Due On January 05 2021 [Member]      
Disclosure of Cash and Cash Equivalents [Line Items]      
Date of investment of deposits 12-29-2020    
Due date of deposits 01-05-2021    
Deposits monthly interest rate 0.05%    
Long-term deposits $ 1,066,428