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PROVISION FOR JUDICIAL LIABILITIES - Contingencies with possible losses (Details)
 1 Months Ended
Mar. 31, 2009
BRL (R$)
Dec. 31, 2024
BRL (R$)
item
Dec. 31, 2023
BRL (R$)
item
Taxes and social security      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 9,837,082,000 R$ 9,775,068,000
Labor      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   171,480,000 194,883,000
Labor | Possible losses      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 171,480 R$ 194,883
Number of lawsuits | item   1,135 1,034
Civil and environment      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 5,065,714,000 R$ 4,462,964,000
Total      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   15,074,276,000 14,432,915,000
Tax contingent liability | Possible losses      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 9,837,082 R$ 9,775,068
Number of lawsuits | item   673 733
Tax contingent liability | Possible losses | PIS/COFINS - Goods and services - 2009 to 2011      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 201,199 R$ 190,875
Tax contingent liability | Possible losses | Tax assessment - taxation on a universal basis, Year 2015      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   4,712 176,917
Tax contingent liability | Possible losses | Tax incentive - Agency for the Development of Northeastern Brazil ("ADENE")      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   150,869 143,912
Tax contingent liability | Possible losses | Offsetting - IRRF - period 2000      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   125,489 120,871
Tax contingent liability | Possible losses | IRPJ/CSLL partial approval of offset of 1997 tax loss      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   122,319 117,130
Tax loss offset approved by tax authorities R$ 83,000    
Difference of tax loss and owned to tax authorities R$ 51,000    
Tax contingent liability | Possible losses | 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   112,168 106,477
Tax contingent liability | Possible losses | 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     102,496
Tax contingent liability | Possible losses | IRPJ/CSLL partial approval of offset of 2000 tax loss      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   101,654  
Tax contingent liability | Possible losses | Income tax assessment - IRPJ/CSLL - Swap of industrial and forestry assets      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   1,688,690 1,630,537
Tax contingent liability | Possible losses | 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   920,628 845,164
Tax contingent liability | Possible losses | 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   875,466 827,186
Tax contingent liability | Possible losses | Tax assessment - Corporate Income Tax and Social Contribution      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 609,548 R$ 563,723