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Investments in Associates and other Companies (Details 2) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [line items]      
Assets $ 1,362,868 $ 1,059,806 $ 962,537
Liabilities 1,201,475 919,068 843,284
Equity 142,750 119,143 102,607
Net income for the year 18,643 21,595 16,646
Redbanc S.A. [Member]      
Disclosure of associates [line items]      
Assets 23,413 20,825 21,235
Liabilities 14,106 12,469 13,751
Equity 8,441 7,505 6,428
Net income for the year 866 851 1,056
Transbank S.A. [Member]      
Disclosure of associates [line items]      
Assets 1,217,448 904,558 822,487
Liabilities 1,133,441 835,200 765,683
Equity 70,605 56,888 48,709
Net income for the year 13,402 12,470 8,095
Centro de Compensacion Automatizado S.A. [Member]      
Disclosure of associates [line items]      
Assets 8,550 7,073 6,871
Liabilities 1,998 1,480 2,174
Equity 5,671 4,677 3,989
Net income for the year 881 916 708
Sociedad Interbancaria de Deposito de Valores S.A. [Member]      
Disclosure of associates [line items]      
Assets 5,074 4,392 3,720
Liabilities 4 230 60
Equity 4,209 3,400 2,858
Net income for the year 861 762 802
Camara de Compensacion de Alto Valor S.A. [Member]      
Disclosure of associates [line items]      
Assets 7,372 6,728 6,338
Liabilities 986 622 500
Equity 6,193 5,722 5,399
Net income for the year 193 384 439
Administrador Financiero del Transantiago S.A. [Member]      
Disclosure of associates [line items]      
Assets 54,712 55,818 51,304
Liabilities 34,787 37,419 35,814
Equity 17,978 15,490 13,907
Net income for the year 1,947 2,909 1,583
Sociedad Nexus S.A. [Member]      
Disclosure of associates [line items]      
Assets 31,147 35,139 32,669
Liabilities 13,471 18,335 18,888
Equity 17,660 13,955 10,354
Net income for the year 16 2,849 3,427
Servicios de Infraestructura de Mercado OTC S.A. [Member]      
Disclosure of associates [line items]      
Assets 15,152 25,273 17,913
Liabilities 2,682 13,313 6,414
Equity 11,993 11,506 10,963
Net income for the year $ 477 $ 454 $ 536