Related-Party Balances and Transactions (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
IfrsStatementLineItems [Line Items]
Revenues	R$ 22,055,720	R$ 19,491,061	R$ 17,797,541
Sanitation Services 1 [Member]
IfrsStatementLineItems [Line Items]
Revenues	661,955	522,608	501,756
Payments Received Related Parties [Member]
IfrsStatementLineItems [Line Items]
Revenues	(632,501)	(439,349)	(520,881)
Payment Received From Reimbursement [Member]
IfrsStatementLineItems [Line Items]
Revenues	R$ (186,690)	R$ (179,787)	R$ (173,874)

The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details