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5 Risk management (Details 6) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Summary of risk management [Line Items] |  |
Borrowings and financing | R$ 21,131,836 |
Accounts payables to suppliers and contractors | 263,741 |
Services payable | 453,750 | R$ 474,078
Public-Private Partnership - PPP | 6,154,950 |
Program contract commitments | 245,595 |
2021 [member] |  |
Summary of risk management [Line Items] |  |
Borrowings and financing | 3,439,199 |
Accounts payables to suppliers and contractors | 263,741 |
Services payable | 453,750 |
Public-Private Partnership - PPP | 404,800 |
Program contract commitments | 163,798 |
2022 [member] |  |
Summary of risk management [Line Items] |  |
Borrowings and financing | 1,994,506 |
Accounts payables to suppliers and contractors |  |
Services payable |  |
Public-Private Partnership - PPP | 405,132 |
Program contract commitments | 33,287 |
2023 [member] |  |
Summary of risk management [Line Items] |  |
Borrowings and financing | 2,019,520 |
Accounts payables to suppliers and contractors |  |
Services payable |  |
Public-Private Partnership - PPP | 405,444 |
Program contract commitments | 33,287 |
2024 [member] |  |
Summary of risk management [Line Items] |  |
Borrowings and financing | 2,177,923 |
Accounts payables to suppliers and contractors |  |
Services payable |  |
Public-Private Partnership - PPP | 350,342 |
Program contract commitments | 1,045 |
2025 [member] |  |
Summary of risk management [Line Items] |  |
Borrowings and financing | 1,672,201 |
Accounts payables to suppliers and contractors |  |
Services payable |  |
Public-Private Partnership - PPP | 333,148 |
Program contract commitments | 1,045 |
2026 onwards [member] |  |
Summary of risk management [Line Items] |  |
Borrowings and financing | 9,828,487 |
Accounts payables to suppliers and contractors |  |
Services payable |  |
Public-Private Partnership - PPP | 4,256,084 |
Program contract commitments | R$ 13,133 |

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