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Income taxes (Details 4) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
IncomeTaxes [Line Items]      
Profit (loss) before tax $ 196,474,395 $ 170,328,270 $ 190,640,106
Tax expense (income) at applicable tax rate (50,100,971) (40,878,785) (42,894,024)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Other tax effects for reconciliation between accounting profit and tax expense (income) 4,071,180 10,357,858 (3,202,337)
Tax effect from change in tax rate (50,071) (856,612) (1,066,964)
Tax effect of foreign tax rates (1,700,857) (1,308,482) (2,278,487)
Tax effect of adjustments for tax of prior peiods (585,257) 2,439,638 (672,704)
Tax expense (income), continuing operations $ 48,365,976 $ 30,246,383 $ 50,114,516
Applicable tax rate 25.50% 24.00% 22.50%
Reconciliation of average effective tax rate and applicable tax rate [abstract]      
Other tax rate effects for reconciliation between accounting profit and tax expense (income) (2.10%) (6.10%) 1.68%
Tax rate effect from change in tax rate 0.03% 0.50% 0.50%
Tax rate effect of foreign tax rates 0.86% 0.80% 1.20%
Tax rate effect of adjustments for current tax of prior periods 0.30% (1.40%) 0.35%
Average effective tax rate 24.59% 17.80% 26.23%