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v3.21.1

22 Services payable (Details Narrative) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Services Payable |  |
Services payable | R$ 453,750 | R$ 474,078

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- Definition The amount represents information related to services payable. + 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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- References No definition available. + Details
Name: | sbs_ServicesPayableAbstract
Namespace Prefix: | sbs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration