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10. Related-Party Balances and Transactions (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |  |
Revenues | R$ 16,085,094 | R$ 14,608,233 | R$ 14,098,208
Sanitation services |  |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |  |
Revenues | 501,146 | 462,989 | 445,726
Payments received from related parties |  |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |  |
Revenues | (509,672) | (471,081) | (424,549)
Receipt of GESP reimbursement referring to Law 4819/58 |  |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |  |
Receipt of GESP reimbursement | R$ (173,516) | R$ (192,889) | R$ (139,472)

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