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Income taxes (Details 4) - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]      
Net income from cash flow hedge $ 93,416 $ (16,196) $ 728
Actuarial gains and losses deriving from defined benefit plans 1,097,001 408,928 (73,169)
Charge to equity $ 1,190,417 $ 392,732 $ (72,441)