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Pension plan obligations (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
IfrsStatementLineItems [Line Items] |  |  |
Defined benefit obligation, beginning | R$ (5,081,485) | R$ (4,717,463) |
Current service cost | (35,951) | (41,440) |
Interest cost | (463,992) | (532,997) |
Actuarial (gains)/losses recorded as other comprehensive income | 852,128 | (206,306) |
Benefits paid | 462,217 | 416,721 |
Defined benefit obligation, ending | (4,267,083) | (5,081,485) | R$ (4,717,463)
Fair value of the plan's assets, beginning | 2,938,614 | 2,567,272 |
Expected return of the plans assets | 274,265 | 294,788 |
Companys contributions | 39,676 | 40,898 |
Participants contributions | 30,180 | 35,443 |
Benefits paid | (240,667) | (202,676) |
Actuarial gains/(losses) recorded as other comprehensive income | (573,886) | 202,889 |
Fair value of the plan's assets, ending | 2,468,182 | 2,938,614 | 2,567,272
Asset ceiling | (132,244) |  |
(Deficit)/Surplus | (1,931,145) | (2,142,871) |
G1 Plan [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Defined benefit obligation, beginning | (2,982,863) | (2,715,388) |
Current service cost | (35,951) | (41,440) |
Interest cost | (274,718) | (307,777) |
Actuarial (gains)/losses recorded as other comprehensive income | 716,927 | (120,934) |
Benefits paid | 240,667 | 202,676 |
Defined benefit obligation, ending | (2,335,938) | (2,982,863) | (2,715,388)
Fair value of the plan's assets, beginning | 2,938,614 | 2,567,272 |
Expected return of the plans assets | 274,265 | 294,788 |
Companys contributions | 39,676 | 40,898 |
Participants contributions | 30,180 | 35,443 |
Benefits paid | (240,667) | (202,676) |
Actuarial gains/(losses) recorded as other comprehensive income | (573,886) | 202,889 |
Fair value of the plan's assets, ending | 2,468,182 | 2,938,614 | 2,567,272
Asset ceiling | (132,244) |  |
(Deficit)/Surplus |  | (44,249) |
G0 Plan [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Defined benefit obligation, beginning | (2,098,622) | (2,002,075) |
Current service cost |  |  |
Interest cost | (189,274) | (225,220) |
Actuarial (gains)/losses recorded as other comprehensive income | 135,201 | (85,372) |
Benefits paid | 221,550 | 214,045 |
Defined benefit obligation, ending | (1,931,145) | (2,098,622) | (2,002,075)
Fair value of the plan's assets, beginning |  |  |
Expected return of the plans assets |  |  |
Companys contributions |  |  |
Participants contributions |  |  |
Benefits paid |  |  |
Actuarial gains/(losses) recorded as other comprehensive income |  |  |
Fair value of the plan's assets, ending |  |  |
Asset ceiling |  |  |
(Deficit)/Surplus | R$ (1,931,145) | R$ (2,098,622) |

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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [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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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_g&doctype=Standard -URIDate 2024-03-27 + Details
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- 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 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_57_a&doctype=Standard -URIDate 2024-03-27 + Details
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