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Income taxes (Details 3) - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Net income from cash flow hedge [1] $ (728) $ 20,648 $ 17,563
Actuarial gains and losses deriving from defined benefit plans 47,228 (659,198) (314,541)
Charge to equity $ (46,500) $ 638,550 $ 296,978
[1] These items will be reclassified to Consolidated Statement of Income once they are settled.