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10. Related-Party Balances and Transactions (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
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$ 174,148 R$ 180,773                  
Receivables in current assets 62,520 54,379                  
Receivables in non-current assets 652,057 611,762                  
Disputed amounts receivable 1,107,104 1,021,657                  
Pension benefit obligations 2,606,107 2,543,877                  
Other liabilities, current 16,055                    
Other liabilities, non-current 90,518                    
Balance related to the first amendment with EMAE 16,622                    
Expenses related to personnel assigned by SABESP to other state government entities 8,903 9,853 R$ 10,393                
Expenses related to personnel by other entities to SABESP 116 0 10                
Payables for services rendered by São Paulo State Government entities 8,694 1,367                  
Non-operating assets 969 969                  
Net actuarial liability 363,902 388,461                  
Compensation to Officers 4,077 3,813 3,912                
Bonus program 538 556 494                
Loan agreement related party, total 32,857 50,617                  
Financial income R$ 2,772 5,017                  
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            
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                    
Connect to the Network Program expenditure concentration 20.00%                    
Connect to the Network Program R$ 100,928 82,697                  
Connect to the Network Program. receivable from related parties 0 0 6,148                
Connect to the Network Program. intangible assets 49,919 35,068                  
Connect to the Network Program. reimbursement R$ 51,009 47,629 R$ 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$ (33,820) R$ (35,114)