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11 Related-Party Balances and Transactions (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 05, 2017
Mar. 31, 2015
Mar. 18, 2015
Mar. 17, 2015
Nov. 17, 2008
Disclosure of transactions between related parties [line items]                
Accounts receivable, current R$ 168,054 R$ 192,906     R$ 696,283      
Undisputed reimbursement               R$ 915,251
Reimbursement receivable related to the reservoirs               696,283
Remaining debit balance               R$ 218,967
Agreement transaction amount           R$ 1,012,310    
Inflation adjustment amount           R$ 316,027    
Preferred shares issued for installments, value             R$ 87,174  
Monthly installment payable       R$ 609,109        
Receivables in current assets 75,377 68,888            
Receivables in non-current assets 634,288 647,107            
Disputed amounts receivable 1,281,409 1,195,217            
Actuarial liability amount 2,549,541 3,046,255            
Other liabilities, current 17,255 16,653            
Other liabilities, non-current 73,660 87,231            
Balance related to the first amendment with EMAE 17,813              
Expenses related to personnel assigned by SABESP to other state government entities 2,108 4,881 R$ 8,903          
Expenses related to personnel by other entities to SABESP 13 139 R$ 116          
Non-operating assets 3,613 3,613            
Net actuarial liability 319,053 314,677            
Compensation to Officers 6,426 5,344            
Bonus program 1,439 1,348            
Total loan agreement related party 9,420 23,866            
Related party - non curent 34,992              
Total amortization amount 3,000              
Amortization of principal amount 1,231              
Amortization of interest R$ 1,769              
Connect to the Network Program expenditure concentration 20.00%              
Total program amount R$ 130,436 117,272            
Total program amount recorded under intangible assets 78,262 65,099            
Total reimbursed program amount R$ 52,174 R$ 52,174            
Number of shares issued 683,509,869 683,509,869 683,509,869          
State Government [member]                
Disclosure of transactions between related parties [line items]                
Connect to the Network Program expenditure concentration 80.00%              
Preference shares [member]                
Disclosure of transactions between related parties [line items]                
Number of shares issued 2,221,000              
Value of shares issued R$ 87,174              
Reimbursement for benefits GESP 2015 [member]                
Disclosure of transactions between related parties [line items]                
Accounts receivable, current 75,377 R$ 68,888            
Allowance for losses [member]                
Disclosure of transactions between related parties [line items]                
Accounts receivable, current R$ 39,127 R$ 39,417 R$ 33,820