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11 Related-Party Balances and Transactions (Tables) | 12 Months Ended
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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)

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