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EQUITY - Earnings per share (Details) - CLP ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings per share      
Earnings attributable to shareholders $ 96,603,371 $ 117,835,790 $ 90,525,991
Average weighted number of shares 946,570,604 946,570,604 946,570,604
Earnings per basic and diluted share (in Chilean pesos) $ 102.06 $ 124.49 $ 95.64
Series A      
Earnings per share      
Earnings attributable to shareholders $ 46,001,994 $ 56,112,755 $ 43,107,979
Average weighted number of shares 473,289,301 473,289,301 473,289,301
Earnings per basic and diluted share (in Chilean pesos) $ 97.20 $ 118.56 $ 91.08
Series B Share      
Earnings per share      
Earnings attributable to shareholders $ 50,601,377 $ 61,723,035 $ 47,418,012
Average weighted number of shares 473,281,303 473,281,303 473,281,303
Earnings per basic and diluted share (in Chilean pesos) $ 106.92 $ 130.42 $ 100.19