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11 Related-Party Balances and Transactions (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of transactions between related parties [line items] |  |  |
Revenues | R$ 17,797,541 | R$ 17,983,654 | R$ 16,085,094
Sanitation services [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | 501,756 | 556,574 | 501,146
Payments received from related parties [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenues | (520,881) | (546,365) | (509,672)
Receipt of reimbursement referring to Law 4,819/58 [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Receipt of GESP reimbursement | R$ (173,874) | R$ (152,112) | R$ (173,516)

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