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Trade and other receivables (Details 3) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]    
Balance at the beginning of year $ (6,059,201) $ (4,154,752)
First application effect IFRS 9 0 (192,377)
Initial balance restated (6,059,201) (4,347,129)
Estimate of expected credit losses up 12 months (903,754) (474,984)
Estimate of expected credit losses longer than 12 months (964,554) (1,222,877)
Sub total of impairment estimate for accounts receivable (1,868,308) (1,697,861)
Provision of repaired portfolio (129,841) (149,303)
Uncollectible accounts 1,389,330 527,545
Add back of unused provisions 441,106 597,359
Estimates resulting from business combinations [1] 0 (1,354,559)
Effect of translation into presentation currency 434,093 364,747
Total $ (5,792,821) $ (6,059,201)
[1] See Note 15 – Business Combinations, letter a).