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Trade and other receivables (Details 4) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Total carrying amount $ 703,249,231 $ 517,490,494
Impairment Provision $ (6,323,298) $ (5,792,821)
Up to date [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Credit loss rate 0.07% 0.13%
Total carrying amount $ 261,030,994 $ 283,828,534
Impairment Provision $ (1,030,614) $ (745,303)
0 a 3 months [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Credit loss rate 7.89% 4.76%
Total carrying amount $ 12,229,749 $ 15,927,492
Impairment Provision $ (415,004) $ (664,608)
3 a 6 months [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Credit loss rate 48.40% 36.48%
Total carrying amount $ 1,140,148 $ 1,072,471
Impairment Provision $ (252,497) $ (344,670)
6 a 12 months [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Credit loss rate 100.00% 100.00%
Total carrying amount $ 4,489,292 $ 1,482,431
Impairment Provision $ (2,150,796) $ (877,811)
More than 12 months [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Credit loss rate 100.00% 100.00%
Total carrying amount $ 2,821,038 $ 3,495,833
Impairment Provision (2,474,387) (3,160,429)
Total Carrying Amount [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Total carrying amount $ 281,711,221 $ 305,806,761