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Income taxes (Details textual) - CLP ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
IncomeTaxes [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate |  | 27.00% | 27.00% | 25.50% |  |  |  |
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. |  |  |  |  |  |
Revaluation Of Assets Terms And Condition One |  | the remaining useful life of the assets to be re-evaluated can never be less than 5 years. |  |  |  |  |  |
Revaluation Of Assets Terms And Condition Two |  | In the case of sale in the first two years, the value of the revaluation to be considered is reduced by 60% (first year) or 30% (second year) |  |  |  |  |  |
Property, plant and equipment, revaluation surplus |  | $ 6,821,753 |  |  |  |  |  |
Income tax rate Increase | 25.00% | 30.00% | (0.01%) | 0.03% |  |  |  |
Percentage of Witholding Tax Rate On Dividends | 13.00% | 7.00% |  |  |  |  |  |
Bottom of range [member] |  |  |  |  |  |  |  |
IncomeTaxes [Line Items] |  |  |  |  |  |  |  |
Special Tax On Revaluation Value |  | 8.00% |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |
IncomeTaxes [Line Items] |  |  |  |  |  |  |  |
Special Tax On Revaluation Value |  | 10.00% |  |  |  |  |  |
CHILE |  |  |  |  |  |  |  |
IncomeTaxes [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate |  |  |  | 25.50% | 24.00% | 22.50% | 21.00% | 20.00%
CHILE | Scenario plan for tax rate [Member] |  |  |  |  |  |  |  |
IncomeTaxes [Line Items] |  |  |  |  |  |  |  |
Applicable tax rate |  |  | 27.00% |  |  |  |  |
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% | 30.00% | 25.00% |  |  |  |  |
Applicable excise tax rate |  |  | 14.00% |  |  |  |  |
Earnings retention ratio |  | 7.00% | 13.00% |  |  |  |  |
April 2014 [Member] |  |  |  |  |  |  |  |
IncomeTaxes [Line Items] |  |  |  |  |  |  |  |
Receivable related to first category income tax refunds |  | $ 968,195 |  |  |  |  |  |

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