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PROPERTY, PLANT, AND EQUIPMENT (Details) - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Total $ 253,586 $ 242,547 $ 257,379
Gross Carrying Amount [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 599,428 533,478 493,001
Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total (345,842) (290,931) (235,622)
Land and Buildings [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 176,957 159,352 169,809
Land and Buildings [Member] | Gross Carrying Amount [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 309,385 274,079 264,016
Land and Buildings [Member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total (132,428) (114,727) (94,207)
Equipment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 58,202 63,516 66,506
Equipment [Member] | Gross Carrying Amount [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 217,958 193,689 168,124
Equipment [Member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total (159,756) (130,173) (101,618)
Ceded Under Operating Leases [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 4,221 4,221 4,230
Ceded Under Operating Leases [Member] | Gross Carrying Amount [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 4,888 4,888 4,888
Ceded Under Operating Leases [Member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total (667) (667) (658)
Other [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 14,206 15,458 16,834
Other [Member] | Gross Carrying Amount [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total 67,197 60,822 55,973
Other [Member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Total $ (52,991) $ (45,364) $ (39,139)