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11 Related-Party Balances and Transactions (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 05, 2017 | Mar. 31, 2015 | Mar. 18, 2015 | Mar. 17, 2015 | Nov. 17, 2008
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Accounts receivable, current | R$ 168,054 | R$ 192,906 |  |  | R$ 696,283 |  |  |
Undisputed reimbursement |  |  |  |  |  |  |  | R$ 915,251
Reimbursement receivable related to the reservoirs |  |  |  |  |  |  |  | 696,283
Remaining debit balance |  |  |  |  |  |  |  | R$ 218,967
Agreement transaction amount |  |  |  |  |  | R$ 1,012,310 |  |
Inflation adjustment amount |  |  |  |  |  | R$ 316,027 |  |
Preferred shares issued for installments, value |  |  |  |  |  |  | R$ 87,174 |
Monthly installment payable |  |  |  | R$ 609,109 |  |  |  |
Receivables in current assets | 75,377 | 68,888 |  |  |  |  |  |
Receivables in non-current assets | 634,288 | 647,107 |  |  |  |  |  |
Disputed amounts receivable | 1,281,409 | 1,195,217 |  |  |  |  |  |
Actuarial liability amount | 2,549,541 | 3,046,255 |  |  |  |  |  |
Other liabilities, current | 17,255 | 16,653 |  |  |  |  |  |
Other liabilities, non-current | 73,660 | 87,231 |  |  |  |  |  |
Balance related to the first amendment with EMAE | 17,813 |  |  |  |  |  |  |
Expenses related to personnel assigned by SABESP to other state government entities | 2,108 | 4,881 | R$ 8,903 |  |  |  |  |
Expenses related to personnel by other entities to SABESP | 13 | 139 | R$ 116 |  |  |  |  |
Non-operating assets | 3,613 | 3,613 |  |  |  |  |  |
Net actuarial liability | 319,053 | 314,677 |  |  |  |  |  |
Compensation to Officers | 6,426 | 5,344 |  |  |  |  |  |
Bonus program | 1,439 | 1,348 |  |  |  |  |  |
Total loan agreement related party | 9,420 | 23,866 |  |  |  |  |  |
Related party - non curent | 34,992 |  |  |  |  |  |  |
Total amortization amount | 3,000 |  |  |  |  |  |  |
Amortization of principal amount | 1,231 |  |  |  |  |  |  |
Amortization of interest | R$ 1,769 |  |  |  |  |  |  |
Connect to the Network Program expenditure concentration | 20.00% |  |  |  |  |  |  |
Total program amount | R$ 130,436 | 117,272 |  |  |  |  |  |
Total program amount recorded under intangible assets | 78,262 | 65,099 |  |  |  |  |  |
Total reimbursed program amount | R$ 52,174 | R$ 52,174 |  |  |  |  |  |
Number of shares issued | 683,509,869 | 683,509,869 | 683,509,869 |  |  |  |  |
State Government [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Connect to the Network Program expenditure concentration | 80.00% |  |  |  |  |  |  |
Preference shares [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Number of shares issued | 2,221,000 |  |  |  |  |  |  |
Value of shares issued | R$ 87,174 |  |  |  |  |  |  |
Reimbursement for benefits GESP 2015 [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Accounts receivable, current | 75,377 | R$ 68,888 |  |  |  |  |  |
Allowance for losses [member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Accounts receivable, current | R$ 39,127 | R$ 39,417 | R$ 33,820 |  |  |  |  |

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