v3.26.1
Related-Party Balances and Transactions (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]      
Revenues R$ 38,092,050 R$ 36,145,477 R$ 25,572,056
Sanitation Services [Member]      
IfrsStatementLineItems [Line Items]      
Revenues 952,803 891,312  
Payments Received Related Parties [Member]      
IfrsStatementLineItems [Line Items]      
Revenues (910,676) (843,026)  
Payment Received From Reimbursement [Member]      
IfrsStatementLineItems [Line Items]      
Revenues R$ (276,307) R$ (178,941)