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21. Services payable (Details Narrative) - BRL (R$) R$ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Services Payable Details Narrative
Services payable	R$ 408,275	R$ 460,054

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- References

No definition available.

+ Details

Name:	SBS_ServicesPayable
Namespace Prefix:	SBS_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

+ Details

Name:	SBS_ServicesPayableDetailsNarrativeAbstract
Namespace Prefix:	SBS_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration