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Related-Party Balances and Transactions (Details Narrative) - BRL (R$)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jul. 31, 2022
Jul. 22, 2022
Apr. 05, 2017
Mar. 18, 2015
IfrsStatementLineItems [Line Items]              
Disputed amounts receivable R$ 1,482,140,000 R$ 1,375,137,000          
Actuarial liability amount 2,002,075,000 2,192,062,000          
Agreement transaction amount             R$ 1,012,310,000
Accounts receivable, current R$ 205,793,000 R$ 173,657,000         696,283,000
Inflation adjustment amount       R$ 325,561,000 R$ 316,027,000   R$ 316,027,000
Number of shares issued 683,509,869 683,509,869          
Monthly installment payable           R$ 609,109,000  
Receivables in current assets R$ 97,075,000 R$ 86,446,000          
Receivables in non-current assets 949,589,000 643,534,000          
Other liabilities, current 8,456,000            
Other liabilities, non-current 95,033,000 88,264,000          
Other liabilities, current 39,025,211,000 7,956,000          
Amount paid 8,963,000            
Expenses related to personnel assigned by SABESP to other state government entities 800,000 734,000 R$ 2,108,000        
Expenses related to personnel by other entities to SABESP 13,000 13,000 R$ 13,000        
Non-operating assets 3,613,000 3,613,000          
Net actuarial liability 148,116,000 129,600,000          
Compensation to Officers 6,175,000 6,369,000          
Bonus program 1,305,000 1,440,000          
Total loan agreement related party 12,953,000 11,884,000          
Total loan agreement related party   11,021,000          
Total loan agreement related party 242,000            
Total loan agreement related party 2,814,000            
Total investment amount 10,800,000            
Investment financed by FEHIDRO 8,700,000            
Investment financed by SABESP R$ 2,100,000            
Financing interest rate 3.00%            
Financing amount R$ 5,100,000 R$ 4,700,000          
Preference shares [member]              
IfrsStatementLineItems [Line Items]              
Number of shares issued 2,221,000            
Value of shares issued R$ 87,174,000