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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