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Stockholders' Equity - Summary of Non-controlling Interests (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of noncontrolling interests [Line Items]      
Non-controlling interests R$ 12,540 R$ 13,684  
Net Income 700 732 R$ 32
Itau CorpBanca [Member]      
Disclosure of noncontrolling interests [Line Items]      
Non-controlling interests 11,270 11,645  
Net Income 504 539  
Itau Corpbanca Colombia S.A. [Member]      
Disclosure of noncontrolling interests [Line Items]      
Non-controlling interests 406 1,268  
Net Income (16) (2)  
Financeira Itau CBD S.A. Credito, Financiamento e Investimento [Member]      
Disclosure of noncontrolling interests [Line Items]      
Non-controlling interests 446 364  
Net Income 131 105  
Luizacred S A Soc Cred Financiamento Investimento [member]      
Disclosure of noncontrolling interests [Line Items]      
Non-controlling interests 295 288  
Net Income 20 44  
Others [Member]      
Disclosure of noncontrolling interests [Line Items]      
Non-controlling interests 123 119  
Net Income R$ 61 R$ 46