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v3.25.1

Provisions (Details Narrative) - BRL (R$) R$ in Thousands | Dec. 31, 2024 | May 22, 2024
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IfrsStatementLineItems [Line Items] |  |
Guarantee insurance for escrow deposit renewed | R$ 339,000 | R$ 900,000
Other Concession Related Legal Proceedings [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Indemnities receivable | 38,922 |
Environmental Lawsuits With Settlements [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Environmental compensation | R$ 276 |

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

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

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

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

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- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=sbs_OtherConcessionRelatedLegalProceedingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |