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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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Public-Private Partnerships, or “PPPs”, are long-term contracts between private parties and government entities, for providing a public asset or service, in which the private parties bears significant risk and management responsibility, and remuneration is linked to performance. PPPs are regulated by the State of São Paulo through Law No. 11,688/2004, which was enacted on May 19, 2004. PPPs may be used for: (i) implantation, expansion, improvement, reform, maintenance or management of public infrastructure; (ii) provision of public services; and (iii) exploitation of public assets and non material rights belonging to the State.

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