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INTANGIBLE ASSETS (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]      
Net balance $ 66,923 $ 63,219 $ 58,085
Gross Carrying Amount [Member]      
Disclosure of detailed information about intangible assets [line items]      
Net balance 353,044 325,047 297,713
Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Net balance $ (286,121) $ (261,828) (239,628)
Licenses [Member]      
Disclosure of detailed information about intangible assets [line items]      
Years of useful life P3Y P3Y  
Average remaining useful life 1 year 1 year  
Net balance $ 976 $ 1,200  
Licenses [Member] | Gross Carrying Amount [Member]      
Disclosure of detailed information about intangible assets [line items]      
Net balance 10,932 10,932 10,932
Licenses [Member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Net balance $ (9,956) $ (9,732) (9,276)
Software development [Member]      
Disclosure of detailed information about intangible assets [line items]      
Years of useful life P3Y P3Y  
Average remaining useful life 2 years 2 years  
Net balance $ 65,947 $ 62,019  
Software development [Member] | Gross Carrying Amount [Member]      
Disclosure of detailed information about intangible assets [line items]      
Net balance 342,112 314,115 286,781
Software development [Member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Net balance $ (276,165) $ (252,096) $ (230,352)