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28 Operating revenue (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of operating revenue [Line Items] |  |  |
Net operating revenue | R$ 17,797,541 | R$ 17,983,654 | R$ 16,085,094
Metropolitan region of sao paulo [member] |  |  |
Summary of operating revenue [Line Items] |  |  |
Net operating revenue | 10,722,384 | 11,849,776 | 10,295,509
Regional systems [member] |  |  |
Summary of operating revenue [Line Items] |  |  |
Net operating revenue | 4,435,396 | 4,284,256 | 3,958,100
Sanitation services [member] |  |  |
Summary of operating revenue [Line Items] |  |  |
Net operating revenue | R$ 15,157,780 | R$ 16,134,032 | R$ 14,253,609

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