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10. Related-Party Balances and Transactions (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 05, 2017
Oct. 28, 2016
Apr. 20, 2016
Mar. 18, 2015
Mar. 17, 2015
Nov. 17, 2008
Nov. 30, 2007
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items]                    
Accounts receivable, current R$ 180,773 R$ 202,553                
Receivables in current assets 54,379 39,816                
Receivables in non-current assets 611,762 650,318                
Disputed amounts receivable 1,021,657 937,035                
Pension benefit obligations 2,543,877 2,512,080                
Other liabilities, current 6,110 9,018                
Other liabilities, non-current 64,180 29,749                
Balance related to the first amendment with EMAE 171,860                  
Expenses related to personnel assigned by SABESP to other state government entities 9,853 10,393 R$ 10,481              
Expenses related to personnel by other entities to SABESP 0 10 342              
Payables for services rendered by São Paulo State Government entities 1,367 1,853                
Non-operating assets 969 969                
Net actuarial liability 388,461 753,170                
Compensation to Officers 3,813 3,912 4,078              
Bonus program 556 494 521              
Loan agreement related party, total 50,617 52,407                
Financial income R$ 5,017 7,118 R$ 10,123              
Payments of installments                   R$ 133,709
Undisputed reimbursement                 R$ 915,251  
Reimbursement receivable related to the reservoirs                 696,283  
GESP Agreement, remaining balance                 R$ 218,967  
GESP Agreement, interest rate 0.50%                  
Government Agreement receivable             R$ 1,012,310      
Government Agreement inflation adjustment             R$ 316,027      
Preferred shares issued for installments     2,221,000              
Preferred shares issued for installments, value               R$ 87,174    
Government Agreement receivable, adjusted       R$ 609,109            
Government Agreement inflation adjustment R$ 316,027                  
CTEEP shares disposed           R$ 111,100        
Use of Reservoirs annual payment         R$ 6,610          
Use of Reservoirs annual payment         R$ 46,270          
Use of Reservoirs annual payment R$ 9,254                  
Reservoirs long-term average outflow 61.70%                  
Shared expenses based on terms of agreement R$ 6,610                  
Present value of balance payable 46,270                  
Balance of the agreement with EMAE - current 15,668                  
Balance of the agreement with EMAE - non current 92,894                  
Amount disbursed, current 1,780                  
Amount disbursed, noncurrent R$ 48,837                  
Connect to the Network Program expenditure concentration 20.00%                  
Connect to the Network Program R$ 82,697 79,274                
Connect to the Network Program. receivable from related parties 0 6,148                
Connect to the Network Program. intangible assets 35,068 34,915                
Connect to the Network Program. reimbursement R$ 47,629 38,211                
State Government                    
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items]                    
Connect to the Network Program expenditure concentration 80.00%                  
Allowance for losses                    
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items]                    
Accounts receivable, current R$ 35,114 R$ 56,624