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5 Risk management (Details 9) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Summary of risk management [Line Items] |  |  |  |
Cash and cash equivalents | R$ 396,401 | R$ 2,253,210 | R$ 3,029,191 | R$ 2,283,047
Financial investments | 3,411,146 | 0 |  |
Restricted cash | 35,742 | 26,018 |  |
Trade receivables | 2,450,986 | 2,353,027 |  |
Water National Agency - ANA | 26,463 | 32,466 |  |
Other receivables | 246,110 | 194,178 |  |
Borrowings and financing | 17,258,624 | 13,244,709 | R$ 13,152,796 | R$ 12,100,966
Accounts payables to suppliers and contractors | 263,741 | 369,631 |  |
Services payable | 453,750 | 474,078 |  |
Program contract commitments | 231,480 | 377,253 |  |
Public-Private Partnership - PPP | 3,175,273 | 3,293,980 |  |
Fair value [member] |  |  |  |
Summary of risk management [Line Items] |  |  |  |
Cash and cash equivalents | 396,401 | 2,253,210 |  |
Financial investments | 3,411,146 |  |  |
Restricted cash | 35,742 | 26,018 |  |
Trade receivables | 2,450,986 | 2,353,027 |  |
Water National Agency - ANA | 26,463 | 32,466 |  |
Other receivables | 246,110 | 194,178 |  |
Borrowings and financing | 17,702,649 | 13,937,611 |  |
Accounts payables to suppliers and contractors | 263,741 | 369,631 |  |
Services payable | 453,750 | 474,078 |  |
Program contract commitments | 231,480 | 377,253 |  |
Public-Private Partnership - PPP | R$ 3,175,273 | R$ 3,293,980 |  |

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- Definition Agreements executed within the scope of the Hydrographic Basin Depollution Program (PRODES), also known as ""Treated Sewage Purchase Program"". This program does not finance works or equipment, remunerates by results achieved, i.e., by effectively treated sewage. In this program, the Water National Agency (ANA) makes available funds, which are restricted to a specific current account and applied in investment funds at the Caixa Econ&amp;amp;amp;amp;amp;amp;amp;#244;mica Federal - Federal Savings Banks (CEF), until the fulfillment of treated sewage volume is evidenced, as well as, the reduction of polluting cargoes of each agreement. When resources are made available, liabilities are recorded until funds are released by ANA. After the evidence of targets stipulated in each contract, the revenue deriving from these funds is recognized, but if these targets are not met, funds will return to the National Treasury with the appropriate funds earnings. + References No definition available. + Details
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