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CURRENT AND DEFERRED INCOME TAXES - Reconciliation of effective rate (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of effective rate          
Net income before taxes   $ 170,798,359 $ 140,856,204 $ 129,740,488  
Tax expense at legal rate 27.00% 25.50% 24.00% 22.50% 21.00%
Tax expense at applicable tax rate   $ (43,553,581) $ (33,805,489) $ (29,191,610)  
Effect of a different tax rate in other jurisdictions   (4,971,103) (9,214,270) (8,161,392)  
Non-taxable revenues   9,645,068 6,068,410 11,778,290  
Non-deductible expenses   (4,020,729) (419,761) (5,557,758)  
Effect of tax on excess tax provision previous periods   125,021 86,731 117,316  
Effect of tax monetary restatement Chilean companies   (1,465,753) (1,875,343) (2,387,349)  
Foreign subsidiaries tax withholding expense and other legal tax debits and credits   (7,556,557) (9,647,371) (8,240,059)  
Adjustments to tax expense   (3,272,950) (5,787,334) (4,289,560)  
Tax expense at effective rate   $ (51,797,634) $ (48,807,093) $ (41,642,562)  
Effective rate   30.60% 34.70% 32.10%