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Income taxes (Details textual)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IncomeTaxes [Line Items]      
Applicable tax rate 27.00% 27.00% 27.00%
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits In accordance with current tax laws in Chile, tax losses do not expire and can be applied indefinitely. Argentina, Uruguay and Paraguay tax losses expire after 5 years and Bolivia tax losses expire after 3 years.    
Income tax rate Increase 25.00% 30.00% (0.01%)
Percentage of Withholding Tax Rate On Dividends 13.00% 7.00%  
CHILE      
IncomeTaxes [Line Items]      
Income tax rate Increase 24.67% 21.54% 29.71%
ARGENTINA      
IncomeTaxes [Line Items]      
Applicable tax rate 35.00%    
Applicable excise tax rate   8.00%  
Earnings retention ratio 13.00% 0.00%  
ARGENTINA | Scenario plan for tax rate [Member]      
IncomeTaxes [Line Items]      
Applicable tax rate 25.00% 25.00% (30.00%)
Applicable excise tax rate     14.00%
Earnings retention ratio   (7.00%) 13.00%