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Pension plan obligations (Details 3) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
IfrsStatementLineItems [Line Items]
Cost of service, net	R$ 5,779	R$ 5,997	R$ 1,020
Interest cost rates	463,992	532,997	408,698
Expected return on the plan's assets	(274,265)	(294,788)	(221,079)
Amount received from State of Sao Paulo (undisputed)	(119,506)	(112,824)	(98,174)
Total expenses	76,020	131,382	90,465
G1 Plan [Member]
IfrsStatementLineItems [Line Items]
Cost of service, net	5,779	5,997	1,020
Interest cost rates	274,718	307,777	231,745
Expected return on the plan's assets	(274,265)	(294,788)	(221,079)
Amount received from State of Sao Paulo (undisputed)
Total expenses	6,252	18,986	11,686
G0 Plan [Member]
IfrsStatementLineItems [Line Items]
Cost of service, net
Interest cost rates	189,274	225,220	176,953
Expected return on the plan's assets
Amount received from State of Sao Paulo (undisputed)	(119,506)	(112,824)	(98,174)
Total expenses	R$ 69,768	R$ 112,396	R$ 78,779

X

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph f
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_f&doctype=Standard
-URIDate 2024-03-27

+ Details

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X

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [domain]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 141
-Subparagraph c
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c_i&doctype=Standard
-URIDate 2024-03-27

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- References

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- References

No definition available.

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- References

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- References

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