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Risk management (Details 10) - BRL (R$) R$ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |  |
Cash and cash equivalents | R$ 22,024,307 | R$ 19,536,350 | R$ 18,295,923 | R$ 18,958,671
Services payable | 838,703 | 750,732 |  |
Public-Private Partnership - PPP | 2,787,032 | 2,798,688 |  |
Carrying amount [member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Cash and cash equivalents | 22,024,307 | 19,536,350 |  |
Trade payables and contractors | 490,494 | 456,215 |  |
Services payable | 838,703 | 750,732 |  |
Program contract commitments | 33,035 | 34,016 |  |
Public-Private Partnership - PPP | 3,222,703 | 3,286,614 |  |
Fair Values [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Cash and cash equivalents | 22,444,692 | 19,950,055 |  |
Trade payables and contractors | 490,494 | 456,215 |  |
Services payable | 838,703 | 750,732 |  |
Program contract commitments | 33,035 | 34,016 |  |
Public-Private Partnership - PPP | R$ 3,222,703 | R$ 3,286,614 |  |

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