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Related-Party Balances and Transactions (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Sep. 26, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 31, 2022
Jul. 22, 2022
Apr. 05, 2017
Mar. 18, 2015
IfrsStatementLineItems [Line Items]                
Disputed amounts receivable   R$ 1,685,493 R$ 1,583,449          
Actuarial liability amount   1,931,145 R$ 2,098,622          
Agreement transaction amount               R$ 1,012,310
Monthly installment payable             R$ 609,109 696,283
Inflation adjustment amount         R$ 325,561 R$ 316,027   R$ 316,027
Number of shares issued     683,509,869          
Receivables in current assets   112,813 R$ 106,022          
Receivables in non-current assets   907,514 933,911          
Expenses related to personnel assigned by SABESP to other state government entities   5,669 8,165 R$ 800        
Non-operating assets   3,613 3,613          
Other liabilities, current   9,434 8,876          
Other liabilities, non-current   104,489 99,279          
Net actuarial liability   132,244 44,249          
Compensation to officers     8,550          
Bonus program   2,043 1,885          
Total investment   10,800            
Investment financed   8,700            
Investment financed Two   R$ 2,100            
Financing interest rate   3.00%            
Financing amount   R$ 2,800 1,300          
Reimbursement amount other assets   99,653            
Dividends and interest on capital payable   341,272            
Aguas De Andradina [Member]                
IfrsStatementLineItems [Line Items]                
Other assets, current   4,007 694          
Other assets, non current     2,814          
Sabesp Olimpia [Member]                
IfrsStatementLineItems [Line Items]                
Other assets, current   2,934            
Other assets, non current   R$ 85,977 R$ 78,611          
Principal plus accumulated interest along with second installment of concession fee R$ 80,707              
Preference shares [member]                
IfrsStatementLineItems [Line Items]                
Number of shares issued   2,221,000            
Value of shares issued   R$ 87,174