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INVESTMENTS IN ASSOCIATES AND OTHER COMPANIES (Details 2) - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of associates [line items] |  |  |
Assets | $ 1,024,702 | $ 962,537 | $ 858,762
Liabilities | 900,751 | 843,284 | 754,547
Equity | 105,202 | 102,607 | 91,669
Net income for the year | 18,749 | 16,646 | 12,546
Centro de Compensacion Automatizado S.A. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Assets | 7,073 | 6,871 | 5,508
Liabilities | 1,480 | 2,174 | 1,523
Equity | 4,677 | 3,989 | 3,241
Net income for the year | 916 | 708 | 744
Redbanc S.A. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Assets | 20,825 | 21,235 | 19,927
Liabilities | 12,469 | 13,751 | 13,505
Equity | 7,505 | 6,428 | 5,307
Net income for the year | 851 | 1,056 | 1,115
Transbank S.A. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Assets | 904,558 | 822,487 | 710,475
Liabilities | 835,200 | 765,683 | 660,957
Equity | 56,888 | 48,709 | 44,309
Net income for the year | 12,470 | 8,095 | 5,209
Sociedad Interbancaria de Deposito de Valores S.A. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Assets | 4,392 | 3,720 | 3,204
Liabilities | 230 | 60 | 103
Equity | 3,400 | 2,858 | 2,435
Net income for the year | 762 | 802 | 666
Sociedad Nexus S.A. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Assets | 35 | 32,669 | 30,038
Liabilities | 18 | 18,888 | 19,229
Equity | 14 | 10,354 | 8,898
Net income for the year | 3 | 3,427 | 1,911
Servicios de Infraestructura de Mercado OTC S.A. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Assets | 25,273 | 17,913 | 29,258
Liabilities | 13,313 | 6,414 | 18,258
Equity | 11,506 | 10,963 | 9,906
Net income for the year | 454 | 536 | 1,094
Administrador Financiero del Transantiago S.A. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Assets | 55,818 | 51,304 | 54,253
Liabilities | 37,419 | 35,814 | 40,345
Equity | 15,490 | 13,907 | 12,758
Net income for the year | 2,909 | 1,583 | 1,150
Camara de Compensacion de Alto Valor S.A. [Member] |  |  |
Disclosure of associates [line items] |  |  |
Assets | 6,728 | 6,338 | 6,099
Liabilities | 622 | 500 | 627
Equity | 5,722 | 5,399 | 4,815
Net income for the year | $ 384 | $ 439 | $ 657

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