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TRADE ACCOUNTS AND OTHER ACCOUNTS RECEIVABLE - Movement in allowance for expected credit losses (Details) - Trade Receivables - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Movement in the allowance for expected credit losses    
Opening balance $ 6,795,663 $ 6,492,987
Increase (decrease) 1,697,887 2,321,958
Provision reversal (3,832,220) (1,595,521)
Increases (decrease) for changes of foreign currency 50,041 (423,761)
Sub - total movements (2,084,292) 302,676
Ending balance $ 4,711,371 $ 6,795,663