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10. Related-Party Balances and Transactions (Tables) | 12 Months Ended
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Dec. 31, 2018
Relatedparty Balances And Transactions Tables Abstract |
Accounts receivable, interest on capital payable, revenue and expenses with the Sao Paulo State Government |
| December 31, 2018 | December 31, 2017
Accounts receivable |  |
Current: |  |
Sanitation services (i) | 122,522 | 118,441
Allowance for losses (i) | (33,820) | (35,114)
Reimbursement for retirement and pension benefits paid (G0): |  |
- monthly flow (payments) (ii) | 22,926 | 22,968
- GESP Agreement – 2008 (ii) | - | 20,099
- GESP Agreement – 2015 (iv) | 62,520 | 54,379
Total current | 174,148 | 180,773
Noncurrent: |  |
Agreement for the installment payment of sanitation services | 17,045 | 22,625
Reimbursement for retirement and pension benefits paid (G0): |  |
- GESP Agreement – 2015 (iv) | 652,057 | 611,762
Total noncurrent | 669,102 | 634,387
Total receivables from shareholders | 843,250 | 815.160
Assets: |  |
Sanitation services | 105,747 | 105,952
Reimbursement of additional retirement and pension benefits (G0) | 737,503 | 709,208
Total | 843,250 | 815,160
Liabilities: |  |
Interest on capital payable to related parties | 338,407 | 300,717
Other (g) | 8,694 | 1,367
| 2018 | 2017 | 2016
Revenue from sanitation services | 501,146 | 462,989 | 445,726
Payments received from related parties | (509,672) | (471,081) | (424,549)
Receipt of GESP reimbursement referring to Law 4,819/58 | (173,516) | (192,889) | (121.709)
Loan agreement through credit facility |
| 2018 | 2017 | 2016
Revenue from sanitation services | 501,146 | 462,989 | 445,726
Payments received from related parties | (509,672) | (471,081) | (424,549)
Receipt of GESP reimbursement referring to Law 4,819/58 | (173,516) | (192,889) | (139,472)

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