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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) |  |  |  |  |  |  |  |  |

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