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Trade and other receivables (Details 4) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Total carrying amount $ 517,490,494 $ 672,389,766
Impairment Provision $ (5,792,821) $ (6,059,201)
Up to date [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Credit loss rate 0.13% 0.10%
Total carrying amount $ 283,828,534 $ 296,424,428
Impairment Provision $ (745,303) $ (148,214)
0 a 3 months [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Credit loss rate 4.76% 4.30%
Total carrying amount $ 15,927,492 $ 22,044,935
Impairment Provision $ (664,608) $ (542,195)
3 a 6 months [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Credit loss rate 36.48% 32.60%
Total carrying amount $ 1,072,471 $ 2,613,051
Impairment Provision $ (344,670) $ (600,433)
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 $ 1,482,431 $ 1,950,716
Impairment Provision $ (877,811) $ (1,407,848)
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 $ 3,495,833 $ 3,728,410
Impairment Provision (3,160,429) (3,360,511)
Total Carrying Amount [Member]    
Disclosure of Credit Loss On Index Tranches On Age Of Portfolio [Line Items]    
Total carrying amount $ 305,806,761 $ 326,761,540