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11 Related-Party Balances and Transactions (Tables)
 12 Months Ended
Dec. 31, 2020
Related party transactions [abstract]  
Schedule of accounts receivable, interest on capital payable, revenue and expenses with the Sao Paulo state government
December 31, 2020 December 31, 2019
Accounts receivable    
Current:    
Sanitation services (i) 109,078 131,851
Allowance for losses (i) (39,127) (39,417)
Reimbursement for retirement and pension benefits paid (G0):    
- monthly flow (payments) (ii) and (vi) 22,726 31,584
- GESP Agreement – 2015 (iv)  75,377  68,888
     
Total current 168,054 192,906
     
Noncurrent:    
    Agreement for the installment payment of sanitation services 4,303 10,883
Reimbursement of additional retirement and pension benefits paid (G0):    
- GESP Agreement – 2015 (iv) 634,288 647,107
     
Total noncurrent 638,591 657,990
     
Total receivables from shareholders 806,645 850,896
     
Assets:    
Sanitation services 74,254 103,317
Reimbursement of additional retirement and pension benefits (G0) 732,391 747,579
     
Total 806,645 850,896
     
Liabilities:    
Interest on capital payable to related parties 116,180 401,963
Schedule of loan agreement through credit facility
2020 2019 2018
       
Revenue from sanitation services 501,756 556,574 501,146
Payments received from related parties (520,881) (546,365) (509,672)
       
Receipt of reimbursement referring to Law 4,819/58 (173,874) (152,112) (173,516)