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Income taxes (Details 5) - CLP ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
IncomeTaxes [Line Items] |  |  |  |
Profit (loss) before tax |  | $ 185,621,574 | $ 458,211,348 | $ 196,474,395
Tax expense (income) at applicable tax rate |  | (50,117,825) | (123,717,064) | (50,100,971)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Other tax effects for reconciliation between accounting profit and tax expense (income) |  | 9,105,693 | (14,596,485) | 4,071,180
Tax effect from change in tax rate |  | 0 | 23,903 | (50,071)
Tax effect of foreign tax rates |  | 1,140,027 | 1,519,558 | (1,700,857)
Tax effect of adjustments for tax of prior peiods |  | (103,809) | 643,271 | (585,257)
Income tax expense |  | $ (39,975,914) | $ (136,126,817) | $ (48,365,976)
Applicable tax rate |  | 27.00% | 27.00% | 25.50%
Reconciliation of average effective tax rate and applicable tax rate [abstract] |  |  |  |
Other tax rate effects for reconciliation between accounting profit and tax expense (income) |  | (4.91%) | 3.19% | (2.07%)
Tax rate effect from change in tax rate | 25.00% | 30.00% | (0.01%) | 0.03%
Tax rate effect of foreign tax rates |  | (0.61%) | (0.33%) | 0.86%
Tax rate effect of adjustments for current tax of prior periods |  | 0.06% | (0.14%) | 0.30%
Average effective tax rate |  | 21.54% | 29.71% | 24.62%

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