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5. Risk Management (Details 6) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
SummaryOfRiskManagementLineItems [Line Items] |  |  |  |  |
Cash and cash equivalents |  | R$ 2,283,047 | R$ 1,886,221 | R$ 1,639,214 | R$ 1,722,991
Restricted cash |  | 18,822 | 24,078 |  |
Trade receivables |  | 1,888,505 | 1,711,306 |  |
Water National Agency - ANA |  | 70,487 | 81,221 |  |
Borrowings and financing |  | 12,100,966 | 11,964,143 | R$ 13,121,600 |
Accounts payables to suppliers and contractors |  | 344,947 |  |  |
Services payable |  | 408,275 | 460,054 |  |
Program contract commitments |  | 110,698 | 69,051 |  |
Public-Private Partnership - PPP | [1] | 6,807,392 |  |  |
Carrying amount |  |  |  |  |
SummaryOfRiskManagementLineItems [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 2,283,047 | 1,886,221 |  |
Restricted cash |  | 18,822 | 24,078 |  |
Trade receivables |  | 1,888,505 | 1,711,306 |  |
Water National Agency - ANA |  | 70,487 | 81,221 |  |
Other receivables |  | 169,715 | 167,369 |  |
Borrowings and financing |  | 12,100,966 | 11,964,143 |  |
Accounts payables to suppliers and contractors |  | 344,947 | 311,960 |  |
Services payable |  | 408,275 | 460,054 |  |
Program contract commitments |  | 239,500 | 178,093 |  |
Public-Private Partnership - PPP |  | 3,071,416 | 2,249,418 |  |
Fair value |  |  |  |  |
SummaryOfRiskManagementLineItems [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 2,283,047 | 1,886,221 |  |
Restricted cash |  | 18,822 | 24,078 |  |
Trade receivables |  | 1,888,505 | 1,711,306 |  |
Water National Agency - ANA |  | 70,487 | 81,221 |  |
Other receivables |  | 169,715 | 167,369 |  |
Borrowings and financing |  | 11,967,909 | 11,776,178 |  |
Accounts payables to suppliers and contractors |  | 344,947 | 311,960 |  |
Services payable |  | 408,275 | 460,054 |  |
Program contract commitments |  | 239,500 | 178,093 |  |
Public-Private Partnership - PPP |  | R$ 3,071,416 | R$ 2,249,418 |  |
[1] | The Company also considered future commitments (construction not yet performed) still not recognized in the financial statements related to Sao Lourenco PPP, due to the relevance of future cash flows, the impacts on its operations and the fact the Company already has formalized this commitment through an agreement signed by the parties.

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- Definition Public-Private Partnerships, or &#8220;PPPs&#8221;, 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 S&#227;o 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. + References No definition available. + Details
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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&#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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