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Income taxes (Details 4) - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]      
Net income from cash flow hedge $ 16,196 $ (728) $ 20,648
Actuarial gains and losses deriving from defined benefit plans (339,533) 47,228 (659,198)
Charge to equity $ 323,337 $ (46,500) $ 638,550