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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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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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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 Econômica 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.

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