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Provision for judicial liabilities - Possible losses - Tax and social securities (Details) - Possible losses - Tax contingent liability [member] | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2009 BRL (R$) | Dec. 31, 2024 BRL (R$) item | Dec. 31, 2023 BRL (R$) item
Disclosure of other provisions [line items] |  |  |
Number of Lawsuits | item |  | 673 | 733
Possible Losses for Which No Provision Was Recorded |  | R$ 9,837,082 | R$ 9,775,068
Income tax assessment - IRPJ/CSLL - Swap of industrial and forestry assets |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 1,688,690 | 1,630,537
Income tax assessment - IRPJ/CSLL: This is an administrative proceeding initiated in October 2023 [Member] |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 920,628 | 845,164
Income tax assessment - IRPJ/CSLL disallowance of depreciation, amortization and depletion expenses - 2010 |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 875,466 | 827,186
Tax assessment - Corporate Income Tax and Social Contribution |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 609,548 | 563,723
PIS/COFINS - Goods and services - 2009 to 2011 |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 201,199 | 190,875
Tax assessment - taxation on a universal basis, Year 2015 |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 4,712 | 176,917
Tax incentive - Agency for the Development of Northeastern Brazil ("ADENE") |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 150,869 | 143,912
Offsetting - IRRF - period 2000 |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 125,489 | 120,871
IRPJ/CSLL partial approval of offset of 1997 tax loss |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 122,319 | 117,130
Tax Loss Offset Approved By Tax Authorities | R$ 83,000 |  |
Difference in Tax loss and Amount Owned To Tax Authorities | R$ 51,000 |  |
Income tax assessment - IRPJ/CSLL Administrative process requiring the collection of IRPJ and CSLL for the 2015 calendar year |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | 112,168 | 106,477
Income tax assessment - IRPJ/CSLL - Income tax assessment - IRPJ/CSLL - Decision Order that partially approved the compensation carried out by the Company |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  |  | R$ 102,496
IRPJ/CSLL partial approval of offset of 2000 tax loss |  |  |
Disclosure of other provisions [line items] |  |  |
Possible Losses for Which No Provision Was Recorded |  | R$ 101,654 |

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