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NET FOREIGN EXCHANGE GAIN (LOSS) (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net foreign exchange gain (loss)      
Net profit (loss) from currency exchange differences $ (212,618) $ 113,115 $ 116,117
Hedging derivatives 252,275 22,933 399,875
Income from assets indexed to foreign currency 12,251 (9,190) (8,745)
Income from liabilities indexed to foreign currency 98 145
Total $ 51,908 $ 126,956 $ 507,392