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Investments in Other Companies - Associates Revenue and profit (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of associates [line items]      
Operating expenses $ (902,250) $ (839,708) $ (784,356)
Income (loss) before taxes 777,406 763,402 687,442
Income taxes 173,661 159,768 115,361
Income for the year 603,745 603,634 $ 572,081
Centro De Compensacion Automatizado S. A. [Member]      
Disclosure of associates [line items]      
Operating income 3,384 3,214  
Operating expenses (2,229) (2,005)  
Other income (expenses) (13) (25)  
Income (loss) before taxes 1,142 1,184  
Income taxes (261) (268)  
Income for the year 881 916  
Sociedad Operadora de la Camara de Compensacion de Pagos de Alto Valor S.A. [Member]      
Disclosure of associates [line items]      
Operating income 3,386 3,302  
Operating expenses (3,348) (3,016)  
Other income (expenses) 159 177  
Income (loss) before taxes 197 463  
Income taxes (4) (79)  
Income for the year 193 384  
Sociedad Operadora De Tarjetas De Credito Nexus S.A. [Member]      
Disclosure of associates [line items]      
Operating income 49,944 50,319  
Operating expenses (49,699) (46,426)  
Other income (expenses) (304) (173)  
Income (loss) before taxes (59) 3,720  
Income taxes 75 (870)  
Income for the year 16 2,850  
Sociedad Interbancaria De Depositos De Valores S. A. [Member]      
Disclosure of associates [line items]      
Operating income 15 1  
Operating expenses (57) (35)  
Other income (expenses) 903 796  
Income (loss) before taxes 861 762  
Income taxes  
Income for the year 861 762  
Redbanc S. A. [Member]      
Disclosure of associates [line items]      
Operating income 38,024 35,314  
Operating expenses (36,693) (33,895)  
Other income (expenses) (195) (260)  
Income (loss) before taxes 1,136 1,159  
Income taxes (270) (308)  
Income for the year 866 851  
Transbank S.A. [Member]      
Disclosure of associates [line items]      
Operating income 222,912 191,568  
Operating expenses (133,128) (177,440)  
Other income (expenses) (72,143) 2,380  
Income (loss) before taxes 17,641 16,508  
Income taxes (4,239) (4,038)  
Income for the year 13,402 12,470  
Administrador Financiero Del Transantiago S. A. [Member]      
Disclosure of associates [line items]      
Operating income 3,707 3,435  
Operating expenses (2,224) (2,615)  
Other income (expenses) 979 2,982  
Income (loss) before taxes 2,462 3,802  
Income taxes (514) (894)  
Income for the year 1,948 2,908  
Servicios de Infraestructura de Mercado OTC S.A. [Member]      
Disclosure of associates [line items]      
Operating income 6,291 6,254  
Operating expenses (5,725) (5,567)  
Other income (expenses) 179 59  
Income (loss) before taxes 745 746  
Income taxes (267) (292)  
Income for the year 478 454  
Associates [Member]      
Disclosure of associates [line items]      
Operating income 327,663 293,407  
Operating expenses (233,103) (270,999)  
Other income (expenses) (70,435) 5,936  
Income (loss) before taxes 24,125 28,344  
Income taxes (5,480) (6,749)  
Income for the year $ 18,645 $ 21,595