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INTANGIBLE ASSETS (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning $ 63,219 $ 58,085
Balances at end 66,923 63,219
Licenses [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning 1,200  
Balances at end 976 1,200
Software development [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning 62,019  
Balances at end 65,947 62,019
Gross Carrying Amount [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning 325,047 297,713
Acquisitions 29,563 32,624
Disposals and impairment (5,290)
Other (1,566)
Balances at end 353,044 325,047
Gross Carrying Amount [Member] | Licenses [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning 10,932 10,932
Acquisitions
Disposals and impairment
Other
Balances at end 10,932 10,932
Gross Carrying Amount [Member] | Software development [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning 314,115 286,781
Acquisitions 29,563 32,624
Disposals and impairment (5,290)
Other (1,566)
Balances at end 342,112 314,115
Accumulated Depreciation and Amortisation [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning (261,828) (239,628)
Year's amortization (24,293) (22,200)
Other
Balances at end (286,121) (261,828)
Accumulated Depreciation and Amortisation [Member] | Licenses [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning (9,732) (9,276)
Year's amortization (224) (456)
Other
Balances at end (9,956) (9,732)
Accumulated Depreciation and Amortisation [Member] | Software development [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balances at beginning (252,096) (230,352)
Year's amortization (24,069) (21,744)
Other
Balances at end $ (276,165) $ (252,096)