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CURRENT AND DEFERRED INCOME TAXES - Distribution of domestic and foreign tax expense (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Distribution of domestic and foreign tax expense      
Current income tax expense $ (47,045,014) $ (44,173,620) $ (41,445,293)
Deferred income tax expense 4,752,620 4,633,473 197,269
Income tax expense (51,797,634) (48,807,093) (41,642,562)
Domestic      
Distribution of domestic and foreign tax expense      
Current income tax expense (16,786,619) (19,421,514) (5,007,156)
Deferred income tax expense 84,638 342,186 9,942,667
Foreign      
Distribution of domestic and foreign tax expense      
Current income tax expense (30,258,395) (24,752,106) (36,438,137)
Deferred income tax expense $ 4,667,982 $ 4,291,287 $ (9,745,398)