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INCOME TAX EXPENSE AND DEFERRED TAXES - Distribution of national and foreign tax expense (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Distribution of domestic and foreign tax expense      
Current tax expense $ (61,725,855) $ (40,261,886) $ (46,464,701)
Deferred tax expense 6,820,456 (20,905,005) (9,100,154)
Income tax expense (54,905,399) (61,166,891) (55,564,855)
National      
Distribution of domestic and foreign tax expense      
Current tax expense (22,597,165) (15,946,310) (22,021,717)
Deferred tax expense (460,031) 3,107,793 21,178
Foreign      
Distribution of domestic and foreign tax expense      
Current tax expense (39,128,690) (24,315,576) (24,442,984)
Deferred tax expense $ 7,280,487 $ (24,012,798) $ (9,121,332)