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Related-Party Balances and Transactions (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Total current R$ 319,546 R$ 261,280
Accounts receivable, noncurrent 908,875 935,272
Total receivables 1,228,421 1,196,552
Total 1,228,421 1,196,552
Liabilities 44,037,376 31,613,581
Agreement For The Installment Payment Of Sanitation Services [Member]    
IfrsStatementLineItems [Line Items]    
Accounts receivable, noncurrent 1,361 1,361
GESP Agreement - 2015 [Member]    
IfrsStatementLineItems [Line Items]    
Accounts receivable, noncurrent 907,514 933,911
Sanitation services [Member]    
IfrsStatementLineItems [Line Items]    
Total 123,121 120,378
Reimbursement For Retirement And Pension Benefits Paid [Member]    
IfrsStatementLineItems [Line Items]    
Total 1,105,300 1,076,174
Interest on capital payable [Member]    
IfrsStatementLineItems [Line Items]    
Liabilities 458,985 420,564
Sanitation services [Member]    
IfrsStatementLineItems [Line Items]    
Total current 173,466 169,515
Allowance For Loss [Member]    
IfrsStatementLineItems [Line Items]    
Total current (51,706) (50,498)
Monthly Flow (Payments) [Member]    
IfrsStatementLineItems [Line Items]    
Total current 84,973 36,241
GESP Agreement - 2015 [Member]    
IfrsStatementLineItems [Line Items]    
Total current R$ 112,813 R$ 106,022