Post-employment benefits - Narrative (Details) - BRL (R$) R$ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of transactions between related parties [line items] | |||
| Plan assets, at fair value | R$ 22,937 | R$ 21,490 | |
| Actuarial assumption of medical cost trend rates | 4.00% | ||
| Inflation rate | 4.00% | ||
| Discount rate | 11.59% | 9.56% | |
| Other comprehensive income | R$ (71) | R$ 5,603 | R$ 3,080 |
| Plano De Beneficios I I | |||
| Disclosure of transactions between related parties [line items] | |||
| Other liabilities | 47 | ||
| Other comprehensive income | 15 | ||
| Other income expenses | (6) | ||
| Itau Unibanco Holding | |||
| Disclosure of transactions between related parties [line items] | |||
| Plan assets, at fair value | 2 | 1 | |
| Itau Unibanco Holding | Real Estate 2 | |||
| Disclosure of transactions between related parties [line items] | |||
| Plan assets, at fair value | R$ 508 | R$ 472 | |