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Stockholders' Equity - Summary of Non-controlling Interests (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2017
Disclosure of noncontrolling interests [Line Items]        
Non-controlling interests R$ 13,684 R$ 12,978   R$ 12,289
Net Income 732 32 R$ 389  
Itau CorpBanca [Member]        
Disclosure of noncontrolling interests [Line Items]        
Non-controlling interests 11,645 11,144    
Net Income 539 (38)    
Itau Corpbanca Colombia S.A. [Member]        
Disclosure of noncontrolling interests [Line Items]        
Non-controlling interests 1,268 1,203    
Net Income (2) (50)    
Financeira Itau CBD S.A. Credito, Financiamento e Investimento [Member]        
Disclosure of noncontrolling interests [Line Items]        
Non-controlling interests 364 297    
Net Income 105 70    
Luizacred S A Soc Cred Financiamento Investimento [member]        
Disclosure of noncontrolling interests [Line Items]        
Non-controlling interests 288 241    
Net Income 44 24    
Others [Member]        
Disclosure of noncontrolling interests [Line Items]        
Non-controlling interests 119 93    
Net Income R$ 46 R$ 26