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PROVISION FOR JUDICIAL LIABILITIES - Possible losses, tax and social securities (Details)
R$ in Thousands
 1 Months Ended
Mar. 31, 2009
BRL (R$)
Dec. 31, 2023
BRL (R$)
item
Dec. 31, 2022
BRL (R$)
item
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 14,432,915 R$ 12,937,551
Tax and social security      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   9,775,068 8,201,246
Tax contingent liability [member]      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 9,775,068 R$ 8,201,246
Tax contingent liability [member] | Possible losses      
PROVISION FOR JUDICIAL LIABILITIES      
Number of lawsuits | item   733 766
Tax contingent liability [member] | Income tax assessment - IRPJ/CSLL - Swap of industrial and forestry assets      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 1,630,537 R$ 2,505,970
Tax contingent liability [member] | Income tax assessment - IRPJ/CSLL: This is an administrative proceeding initiated in October 2023 [Member]      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   845,164  
Tax contingent liability [member] | Income tax assessment - IRPJ/CSLL disallowance of depreciation, amortization and depletion expenses - 2010      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   827,186 777,362
Tax contingent liability [member] | Tax assessment - Corporate Income Tax and Social Contribution      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   563,723 516,433
Tax contingent liability [member] | PIS/COFINS - Goods and services - 2009 to 2011      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   190,875 180,219
Tax contingent liability [member] | Tax assessment - taxation on a universal basis, Year 2015      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   176,917 163,059
Tax contingent liability [member] | Tax incentive - Agency for the Development of Northeastern Brazil ("ADENE")      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   143,912 136,733
Tax contingent liability [member] | Offsetting - IRRF - period 2000      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   120,871 116,105
Tax contingent liability [member] | IRPJ/CSLL partial approval of offset of 1997 tax loss      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   117,130 111,775
Tax loss offset approved by tax authorities R$ 83    
Difference of tax loss and owned to tax authorities R$ 51    
Tax contingent liability [member] | Income tax assessment - IRPJ/CSLL Administrative process requiring the collection of IRPJ and CSLL for the 2015 calendar year [Member]      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   106,477 97,515
Tax contingent liability [member] | Income tax assessment - IRPJ/CSLL - Income tax assessment - IRPJ/CSLL - Decision Order that partially approved the compensation carried out by the Company [Member]      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 102,496 R$ 93,232