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EQUITY - Earnings per share (Details) - CLP ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share      
Earnings attributable to shareholders $ 117,835,790 $ 90,525,991 $ 87,863,484
Average weighted number of shares 946,570,604 946,570,604 946,570,604
Earnings per basic and diluted share (in Chilean pesos) $ 124.49 $ 95.64 $ 92.82
Series A      
Earnings per share      
Earnings attributable to shareholders $ 56,112,755 $ 43,107,979 $ 41,840,108
Average weighted number of shares 473,289,301 473,289,301 473,289,301
Earnings per basic and diluted share (in Chilean pesos) $ 118.56 $ 91.08 $ 88.40
Series B Share      
Earnings per share      
Earnings attributable to shareholders $ 61,723,035 $ 47,418,012 $ 46,023,376
Average weighted number of shares 473,281,303 473,281,303 473,281,303
Earnings per basic and diluted share (in Chilean pesos) $ 130.42 $ 100.19 $ 97.24