Securities at amortized cost (AC) - Narrative (Details) - BRL (R$) R$ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of financial assets [line items] | ||
| Securities pledged as collateral of funding transactions of financial institutions and clients | R$ 15,479 | R$ 70,222 |
| Brazil | ||
| Disclosure of financial assets [line items] | ||
| Securities pledged as collateral of funding transactions of financial institutions and clients | 14,207 | 39,289 |
| Latin America | ||
| Disclosure of financial assets [line items] | ||
| Securities pledged as collateral of funding transactions of financial institutions and clients | 894 | 969 |
| Corporate securities | ||
| Disclosure of financial assets [line items] | ||
| Securities pledged as collateral of funding transactions of financial institutions and clients | R$ 378 | R$ 29,964 |