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Income taxes (Details 5) - CLP ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
IncomeTaxes [Line Items] |  |  |  |
Profit (loss) before tax |  | $ 143,603,276 | $ 185,621,574 | $ 458,211,348
Tax expense (income) at applicable tax rate |  | (38,772,885) | (50,117,825) | (123,717,064)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Other tax effects for reconciliation between accounting profit and tax expense (income) |  | 6,626,165 | 9,105,693 | (14,596,485)
Tax effect from change in tax rate |  | 0 | 0 | 23,903
Derecognition of deferred tax assets not recoverable (1) | [1] | (3,529,795) | 0 | 0
Tax effect of foreign tax rates |  | (540,129) | 1,140,027 | 1,519,558
Tax effect of adjustments for tax of prior peiods |  | 808,224 | (103,809) | 643,271
Income tax expense |  | $ (35,408,420) | $ (39,975,914) | $ (136,126,817)
Applicable tax rate |  | 27.00% | 27.00% | 27.00%
Reconciliation of average effective tax rate and applicable tax rate [abstract] |  |  |  |
Other tax rate effects for reconciliation between accounting profit and tax expense (income) |  | (4.61%) | (4.91%) | 3.19%
Tax rate effect from change in tax rate |  | 25.00% | 30.00% | (0.01%)
Derecognition of deferred tax assets not recoverable (1) | [1] | 2.46% | 0.00% | 0.00%
Tax rate effect of foreign tax rates |  | 0.38% | (0.61%) | (0.33%)
Tax rate effect of adjustments for current tax of prior periods |  | (0.56%) | 0.06% | (0.14%)
Average effective tax rate |  | 24.67% | 21.54% | 29.71%
[1] | The Company has written off deferred tax asset accounts that it estimates will not be recoverable in the foreseeable future.

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