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Equity - Shareholders' composition (Details) - shares
Dec. 31, 2019
Dec. 31, 2018
Shareholders' composition:    
Number of shares 101,017,081,114 101,017,081,114
% of Equity Holding (in percentage) 100.00% 100.00%
Sociedad Administradora de la Obligación Subordinada SAOS S.A. [Member]    
Shareholders' composition:    
Number of shares   28,593,701,789
% of Equity Holding (in percentage)   28.31%
LQ Inversiones Financieras S.A. [Member]    
Shareholders' composition:    
Number of shares 46,815,289,329 27,460,203,382
% of Equity Holding (in percentage) 46.34% 27.18%
Sociedad Matriz del Banco de Chile S.A. [Member]    
Shareholders' composition:    
Number of shares   12,138,573,251
% of Equity Holding (in percentage)   12.02%
Other minority shareholders [Member]    
Shareholders' composition:    
Number of shares 43,638,381,510 32,824,602,692
% of Equity Holding (in percentage) 43.20% 32.49%
Banchile Corredores De Bolsa S.a [Member]    
Shareholders' composition:    
Number of shares 5,708,422,261  
% of Equity Holding (in percentage) 5.65%  
Inversiones LQ-SM Limitada [Member]    
Shareholders' composition:    
Number of shares 4,854,988,014  
% of Equity Holding (in percentage) 4.81%