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

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- References No definition available. + Details
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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. + References No definition available. + Details
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Namespace Prefix: | sbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant