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PROPERTY, PLANT, AND EQUIPMENT (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning $ 242,547 $ 257,379  
Impairment due to damage 39 5,644 $ 234
Balances at end 253,586 242,547 257,379
Land and Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 159,352 169,809  
Balances at end 176,957 159,352 169,809
Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 63,516 66,506  
Balances at end 58,202 63,516 66,506
Ceded Under Operating Leases [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 4,221 4,230  
Balances at end 4,221 4,221 4,230
Other [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 15,458 16,834  
Balances at end 14,206 15,458 16,834
Gross Carrying Amount [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 533,478 493,001  
Additions 68,329 58,772  
Disposals (6,297) (17,941)  
Impairment due to damage (39) (354)  
Other 3,956  
Balances at end 599,428 533,478 493,001
Gross Carrying Amount [Member] | Land and Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 274,079 264,016  
Additions 35,369 27,592  
Disposals (63) (17,529)  
Impairment due to damage  
Other  
Balances at end 309,385 274,079 264,016
Gross Carrying Amount [Member] | Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 193,689 168,124  
Additions 28,438 26,278  
Disposals (4,130) (359)  
Impairment due to damage (39) (354)  
Other  
Balances at end 217,958 193,689 168,124
Gross Carrying Amount [Member] | Ceded Under Operating Leases [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 4,888 4,888  
Additions  
Disposals  
Impairment due to damage  
Other  
Balances at end 4,888 4,888 4,888
Gross Carrying Amount [Member] | Other [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning 60,822 55,973  
Additions 4,522 4,902  
Disposals (2,104) (53)  
Impairment due to damage  
Other 3,956  
Balances at end 67,197 60,822 55,973
Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning (290,931) (235,622)  
Additions (54,987) (55,623)  
Disposals 77 313  
Impairment due to damage    
Other    
Balances at end (345,842) (290,931) (235,622)
Accumulated Depreciation and Amortisation [Member] | Land and Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning (114,727) (94,207)  
Additions (17,704) (20,744)  
Disposals 3 224  
Impairment due to damage  
Other  
Balances at end (132,428) (114,727) (94,207)
Accumulated Depreciation and Amortisation [Member] | Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning (130,173) (101,618)  
Additions (29,623) (28,592)  
Disposals 40 38  
Impairment due to damage  
Other  
Balances at end (159,756) (130,173) (101,618)
Accumulated Depreciation and Amortisation [Member] | Ceded Under Operating Leases [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning (667) (658)  
Additions (9)  
Disposals  
Impairment due to damage  
Other  
Balances at end (667) (667) (658)
Accumulated Depreciation and Amortisation [Member] | Other [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balances at beginning (45,364) (39,139)  
Additions (7,660) (6,277)  
Disposals 34 51  
Impairment due to damage  
Other  
Balances at end $ (52,991) $ (45,364) $ (39,139)