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Intangible assets (Details Narrative)
R$ in Thousands
 12 Months Ended
Aug. 22, 2024
BRL (R$)
Jul. 23, 2024
Municipalities
Dec. 31, 2024
BRL (R$)
Municipalities
Dec. 31, 2023
BRL (R$)
Municipalities
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]            
Right of use     R$ 44,771,124 R$ 44,012,858 R$ 39,320,871 R$ 36,503,834
Average amortization rate     2.80% 5.40% 5.20%  
Sao Paulo [Member]            
IfrsStatementLineItems [Line Items]            
Number of municipalities | Municipalities     375 376    
URAE-1 [Member]            
IfrsStatementLineItems [Line Items]            
Number of municipalities | Municipalities   371        
SABESP [Member]            
IfrsStatementLineItems [Line Items]            
Net revenue R$ 2,280,000          
Concession agreement – URAE-1 [Member]            
IfrsStatementLineItems [Line Items]            
Right of use     R$ 338,740      
Concession Agreements [Member]            
IfrsStatementLineItems [Line Items]            
Right of use       R$ 43,738 R$ 54,356 65,012
Program contracts [Member]            
IfrsStatementLineItems [Line Items]            
Right of use       330,941 168,216 180,669
Leases Related To Concession Agreements And Program Contracts [Member]            
IfrsStatementLineItems [Line Items]            
Right of use       R$ 374,679 R$ 222,572 R$ 245,681