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Stockholders' equity (Details 5) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Non-controlling interests R$ 9,390 R$ 11,612  
Income 1,035 1,624 R$ (3,832)
Income 1,035 1,624 (3,832)
Itau Corpbanca [Member]      
IfrsStatementLineItems [Line Items]      
Non-controlling interests 6,926 9,836  
Income 887 1,310 (4,135)
Itau Corpbanca Colombia S.A. [Member]      
IfrsStatementLineItems [Line Items]      
Non-controlling interests 14 476  
Income 3 38 (15)
Financeira Itau CBD S.A. Credito, Financiamento e Investimento [Member]      
IfrsStatementLineItems [Line Items]      
Non-controlling interests 769 666  
Income 123 131 164
Luizacred S A Soc Cred Financiamento Investimento [member]      
IfrsStatementLineItems [Line Items]      
Non-controlling interests 377 426  
Income (50) 76 102
Other Subsidiaries [Member]      
IfrsStatementLineItems [Line Items]      
Non-controlling interests 1,304 208  
Income R$ 72 R$ 69 R$ 52