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28 Operating revenue (Details Narrative) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Revenue
Amount corresponding to TRCF charged from customers	R$ 72,962	R$ 70,122

X

- Definition

The amount corresponding to trcf charged from customers.

+ References

No definition available.

+ Details

Name:	sbs_AmountCorrespondingToTrcfChargedFromCustomers
Namespace Prefix:	sbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	sbs_OperatingRevenueAbstract
Namespace Prefix:	sbs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration