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Trade receivables (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Subtotal R$ 4,706,325 R$ 4,198,399
Allowance for doubtful accounts (1,428,517) (1,280,088)
Total trade receivables 3,277,808 2,918,311
Current 3,062,574 2,695,077
Noncurrent 215,234 223,234
Trade receivables 3,277,808 2,918,311
Private Sector [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 2,704,332 2,556,639
Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 993,318 873,523
Wholesale Municipal Governments [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal [1] 49,415 28,044
General And Special Customers [Member] | Private Sector [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal [2],[3] 2,287,782 2,042,023
Agreements [Member] | Private Sector [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal [4] 416,550 514,616
Agreements [Member] | Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal [4] 372,943 278,844
Municipal [Member] | Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 609,731 586,810
Federal [Member] | Government Entities [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal 10,644 7,869
Mogi Das Cruzes [Member] | Wholesale Municipal Governments [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal [1] 4,048 3,580
Sao Caetano Do Sul [Member] | Wholesale Municipal Governments [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal [1] 45,367 24,464
Unbilled Supply [Member]    
IfrsStatementLineItems [Line Items]    
Subtotal R$ 959,260 R$ 740,193
[1] Wholesale basis customers - municipal governments - This balance refers to invoices issued as a result of services provided to municipalities, which are responsible for distributing to, billing and charging final customers.
[2] General customers - residential and small and mid-sized companies;
[3] Special customers - large consumers, commercial, industries, condominiums and special billing customers (fixed demand agreements, industrial waste, wells, among others);
[4] Agreements - installment payments of past-due receivables, plus inflation adjustment and interest, according to the agreements;