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v3.24.1.1.u2

Pension plan obligations (Details Narrative) - G 1 Plan [Member] | 3 Months Ended
--- | ---
Mar. 31, 2024
IfrsStatementLineItems [Line Items] |
Description of defined benefit plan | 0.99% of the portion of the salary of participation up to 20 salaries; and
Additional description of defined benefit plan | 8.39% of the surplus, if any, of the portion of the salary of participation over 20 salaries.

X
- References No definition available. + Details
Name: | sbs_DescriptionOfDefinedBenefitPlan
Namespace Prefix: | sbs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | sbs_DescriptionOfDefinedBenefitPlan1
Namespace Prefix: | sbs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | sbs_IfrsStatementLineItems
Namespace Prefix: | sbs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=sbs_G1PlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |