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FINANCIAL RISK MANAGEMENT - Investment Risk by Country (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Exchange Rate Risk        
Total Equity $ 813,233,349 $ 842,170,027 $ 851,534,300 $ 918,997,733
Total assets 2,114,859,467 2,199,109,747 2,209,361,024  
Total liabilities 1,301,626,117 $ 1,356,939,720 $ 1,357,826,724  
Currency risk | Argentina        
Exchange Rate Risk        
Total Equity 86,806,727      
Total assets 190,848,657      
Total liabilities $ 104,041,930      
Percentage of entity's revenue 29.90%      
Appreciation (devaluation) of foreign currency against the domestic currency (21.80%)      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (1,676,795)      
Increase (decrease) in equity due to a reasonably possible risk increase (3,034,568)      
Increase (decrease) in assets due to a reasonably possible risk increase (7,976,544)      
Increase (decrease) in liabilities due to a reasonably possible risk increase (4,941,976)      
Currency risk | Brazil        
Exchange Rate Risk        
Total Equity 267,651,617      
Total assets 796,372,514      
Total liabilities $ 528,720,897      
Percentage of entity's revenue 32.60%      
Appreciation (devaluation) of foreign currency against the domestic currency (9.50%)      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (2,012,627)      
Increase (decrease) in equity due to a reasonably possible risk increase (11,455,756)      
Increase (decrease) in assets due to a reasonably possible risk increase (34,892,774)      
Increase (decrease) in liabilities due to a reasonably possible risk increase (23,437,018)      
Currency risk | Paraguay        
Exchange Rate Risk        
Total Equity 232,553,018      
Total assets 264,698,133      
Total liabilities $ 32,145,115      
Percentage of entity's revenue 7.60%      
Appreciation (devaluation) of foreign currency against the domestic currency 5.30%      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (1,103,808)      
Increase (decrease) in equity due to a reasonably possible risk increase (11,082,603)      
Increase (decrease) in assets due to a reasonably possible risk increase (12,580,330)      
Increase (decrease) in liabilities due to a reasonably possible risk increase $ (1,497,727)