Stockholders' equity - Schedule of Non-Controlling Interests (Details) - BRL (R$) R$ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of subsidiaries [line items] | |||
| Stockholders’ equity | R$ 10,575 | R$ 10,194 | |
| Income | 992 | 1,043 | R$ 772 |
| Banco Itaú Chile | |||
| Disclosure of subsidiaries [line items] | |||
| Stockholders’ equity | 8,337 | 8,009 | |
| Income | 608 | 627 | 598 |
| Itaú Colombia S.A. | |||
| Disclosure of subsidiaries [line items] | |||
| Stockholders’ equity | 22 | 21 | |
| Income | 0 | 0 | 0 |
| Financeira Itaú CBD S.A. Crédito, Financiamento e Investimento | |||
| Disclosure of subsidiaries [line items] | |||
| Stockholders’ equity | 715 | 706 | |
| Income | 169 | 174 | 147 |
| Luizacred S.A. Soc. Cred. Financiamento Investimento | |||
| Disclosure of subsidiaries [line items] | |||
| Stockholders’ equity | 1,103 | 976 | |
| Income | 126 | 148 | (49) |
| Other | |||
| Disclosure of subsidiaries [line items] | |||
| Stockholders’ equity | 398 | 482 | |
| Income | R$ 89 | R$ 94 | R$ 76 |