Segment Information - Narrative (Details) - BRL (R$) R$ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Segment Information [Abstract] | ||
| Interest margin and similar income and expenses | R$ 35,452 | R$ 74,980 |
| Net gains (loss) on investment securities and derivatives | 58,054 | 32,011 |
| Results from foreign exchange operation | 19,218 | (3,143) |
| Depreciation and amortization expenses | (7,419) | R$ (7,177) |
| Interest and similar income and expenses | 64,135 | |
| Net gains (loss) on investment securities and derivatives | 29,145 | |
| Results from foreign exchange operation | 4,432 | |
| Depreciation and amortization expenses | R$ (6,529) | |