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PROVISION FOR JUDICIAL LIABILITIES - Additional information (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2009
BRL (R$)
Dec. 31, 2020
BRL (R$)
ha
lawsuit
Oct. 05, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Number of lawsuits deemed possible loss   782    
Provisions for possible losses   R$ 7,145,147,000    
Labor        
PROVISION FOR JUDICIAL LIABILITIES        
Number of lawsuits in which the Company is a defendant | lawsuit   1,653    
Provisions for possible losses   R$ 263,971,000    
Civil and environment        
PROVISION FOR JUDICIAL LIABILITIES        
Number of lawsuits in which the Company is a defendant | lawsuit   324    
Provisions for possible losses   R$ 3,068,884,000    
Lawsuit dispute period   30 years    
Income tax assessment - IRPJ/CSLL - Swap of industrial and forestry assets | Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Provisions for possible losses   R$ 2,296,032,000   R$ 2,251,462,000
Income tax assessment - IRPJ/CSLL disallowance of depreciation, amortization and depletion expenses - 2010 | Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Provisions for possible losses   712,531,000   695,679,000
IRPJ/CSLL Partial Approval of Offset of 1997 Tax Loss | Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Provisions for possible losses   104,873,000   254,081,000
Tax loss offset approved by tax authorities R$ 83,000,000      
Difference of tax loss and owned to tax authorities R$ 51,000,000      
Tax incentive - Agency for the Development of Northeastern Brazil ("ADENE") | Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Provisions for possible losses   127,391,000   125,191,000
PIS/COFINS - Goods and services - 2009 to 2011 | Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Provisions for possible losses   166,355,000   162,750,000
Offsetting - IRRF - period 2000 | Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Provisions for possible losses   109,903,000   R$ 108,320,000
Tax assessment - Corporate Income Tax and Social Contribution | Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Tax Assessment, Corporate Income Tax and Social Contribution     R$ 454,898,000  
Tax assessment - taxation on a universal basis, Year 2015 | Taxes        
PROVISION FOR JUDICIAL LIABILITIES        
Provisions for possible losses   R$ 145,026,000    
Public Civil Claims, transportation of wood | Civil        
PROVISION FOR JUDICIAL LIABILITIES        
Number of lawsuits in which the Company is a defendant | lawsuit   2    
Public Civil Claims, real properties acquired | Civil        
PROVISION FOR JUDICIAL LIABILITIES        
Number of lawsuits in which the Company is a defendant | lawsuit   2    
Public Civil Claims, real properties acquired | Civil | Public Civil Claim 1        
PROVISION FOR JUDICIAL LIABILITIES        
Area blocked in preliminary injunction | ha   6,000    
Public Civil Claims, real properties acquired | Civil | Public Civil Claim 2        
PROVISION FOR JUDICIAL LIABILITIES        
Area blocked in preliminary injunction | ha   5,601