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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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The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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