XML 137 R128.htm IDEA: XBRL DOCUMENT 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: