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26. Operating revenue (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SummaryOfOperatingRevenueLineItems [Line Items] |  |  |  |  |
Net operating revenue | R$ 14,608,233 |  | R$ 14,098,208 |  | R$ 11,711,569
Metropolitan region of Sao Paulo |  |  |  |  |
SummaryOfOperatingRevenueLineItems [Line Items] |  |  |  |  |
Net operating revenue | 8,636,926 |  | 7,749,694 |  | 6,021,949
Regional Systems |  |  |  |  |
SummaryOfOperatingRevenueLineItems [Line Items] |  |  |  |  |
Net operating revenue | 3,586,820 |  | 3,372,538 |  | 2,924,876
Sanitation services |  |  |  |  |
SummaryOfOperatingRevenueLineItems [Line Items] |  |  |  |  |
Net operating revenue | R$ 12,223,746 | [1] | R$ 11,122,232 | [1] | R$ 8,946,825
[1] | Includes the amount of R$ 8,771 corresponding to the TRCF charged from customers from the municipalities regulated by ARSESP.

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