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Trade and other receivables (Details 3) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]    
Balance at the beginning of year $ (5,792,821) $ (6,059,201)
Estimate of expected credit losses up 12 months (2,324,015) (1,837,905)
Estimate of expected credit losses longer than 12 months (349,928) (267,183)
Estimate for expected credit losses due to debt settlement (151,343) (11,660)
Impairment provision of accounts receivable (2,881,290) (2,116,748)
Uncollectible accounts 1,269,299 1,711,930
Add back of unused provisions 701,121 398,405
Effect of translation into presentation currency 380,393 272,793
Total $ (6,323,298) $ (5,792,821)