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21 Employees benefits (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of employee benefits [Line Items]
Present value of defined benefit obligations	R$ (5,662,521)	R$ (6,113,349)	R$ (5,138,445)
Fair value of the plan's assets	2,793,927	2,752,417	2,168,436
Liability as per statement of financial position - pension obligations	(2,868,594)	(3,360,932)
G1 Plan [member]
Summary of employee benefits [Line Items]
Present value of defined benefit obligations	(3,112,980)	(3,067,094)	(2,532,338)
Fair value of the plan's assets	2,793,927	2,752,417	2,168,436
Liability as per statement of financial position - pension obligations	(319,053)	(314,677)
G0 plan [member]
Summary of employee benefits [Line Items]
Present value of defined benefit obligations	(2,549,541)	(3,046,255)	(2,606,107)
Fair value of the plan's assets	0	0	R$ 0
Liability as per statement of financial position - pension obligations	R$ (2,549,541)	R$ (3,046,255)

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2020-01-01

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X

- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2020-01-01

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X

- Definition

Defined Benefit The Company makes contributions to defined benefit plans on a contractual basis and sponsored thereby, managed by Fundação Sabesp de Seguridade Social (“Sabesprev”), a supplementary private pension closely-held entity. The regular contributions comprise the net administrative expenses and are recognized in the income statement for the period. Liabilities from defined benefit pension plan obligations correspond to the present value of the defined benefit obligation at the end of the reporting period, less the fair value of the plan’s assets. The defined benefit obligation (G1) and (G0) are calculated on an annual basis by independent actuaries, using the projected unit credit method. The estimated future cash outflows is discounted to its present value, using the interest rates of Government bonds with maturities that approximate the maturity of the related liability. Defined Contribution The Company makes contributions to defined contribution pl

+ References

No definition available.

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X

- Definition

Its represents information related to summary of employee benefits.

+ References

No definition available.

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