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Investments accounted for using equity method (Details 3) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Investments Accounted For Using Equity Method [Line Items]      
Balance at the beginning of year $ 136,098,062 $ 142,017,781  
Other payments to acquire interests in joint ventures 19,287,372 13,549,638  
Participation in the joint ventures and associates (loss) (8,437,209) (16,431,759) $ (10,815,520)
Capital decrease (1,355,651) (11,200,000)  
Dividends received (423,669) (614,591)  
Business combinations 0 (241,885)  
Others (14,062,120) 9,018,878  
Total $ 131,106,785 $ 136,098,062 $ 142,017,781