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12 Investments (Details Narrative) - BRL (R$) R$ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 20, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of investments [Line Items] |  |  |  |
Capital stock |  | R$ 15,000,000 | R$ 15,000,000 |
Capital stock, shares |  | 683,509,869 |  |
Number of shares issued |  | 683,509,869 | 683,509,869 | 683,509,869
Aguas de andradina [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Capital stock |  | R$ 17,936 |  |
Capital stock, shares |  | 17,936,174 |  |
Equity interest |  | 30.00% | 30.00% | 30.00%
Saneaqua mairinque [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Capital stock |  | R$ 26,127 |  |
Capital stock, shares |  | 20,320,227 |  |
Equity interest |  | 4.60% | 30.00% | 30.00%
Other investments | R$ 5,734 |  |  |
Capital increase | R$ 21,944 |  |  |
Number of shares issued | 17,178,988 |  |  |
Aquapolo ambiental [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Capital stock |  | R$ 36,412 |  |
Capital stock, shares |  | 42,419,045 |  |
Equity interest |  | 49.00% | 49.00% | 49.00%
Sesamm [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Capital stock |  | R$ 19,532 |  |
Capital stock, shares |  | 19,532,409 |  |
Equity interest |  | 36.00% | 36.00% | 36.00%
Attend ambiental [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Capital stock |  | R$ 37,677 |  |
Capital stock, shares |  | 37,677,245 |  |
Equity interest |  | 45.00% | 45.00% | 45.00%
Aguas de castilho [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Capital stock |  | R$ 2,785 |  |
Capital stock, shares |  | 2,785,225 |  |
Equity interest |  | 30.00% | 30.00% | 30.00%
Paulista geradora de energia [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Capital stock |  | R$ 8,679 |  |
Capital stock, shares |  | 8,679,040 |  |
Equity interest |  | 25.00% | 25.00% | 25.00%
Igua saneamento s.a [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Percentage of equity interest held |  | 70.00% |  |
Servtec investimentos e participacoes ltda [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Percentage of equity interest held |  | 37.50% |  |
Tecniplan engenharia e comercio ltda [member] |  |  |  |
Disclosure of investments [Line Items] |  |  |  |
Percentage of equity interest held |  | 37.50% |  |

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