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13 Investment properties (Details Narrative) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment property [abstract]
Investment properties, market value	R$ 383,000	R$ 386,000

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- References

No definition available.

+ Details

Name:	ifrs-full_InvestmentPropertyAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The amount represents information related to investment property marke value.

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No definition available.

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Name:	sbs_InvestmentPropertyMarketValue
Namespace Prefix:	sbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant