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Financial assets at fair value through other comprehensive income - Securities (Details Narrative) - BRL (R$) R$ in Millions |  | 1 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Dec. 31, 2023
IfrsStatementLineItems [Line Items] |  |  |  |  |
Receipt of dividends |  |  |  |  | R$ 275
Total sale of equity |  | R$ 78 | R$ 78 |  |
Sale of equity fair value |  | R$ 387 | R$ 1,121 |  |
Pismo Holdings Shares [Member] |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |
Total sale of equity | R$ 150 |  |  | R$ 657 |
Sale of equity fair value | R$ 192 |  |  | R$ 4,508 |

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