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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$)
Dec. 31, 2021
BRL (R$)
lawsuit
Dec. 31, 2020
BRL (R$)
lawsuit
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 11,443,483 R$ 10,478,002
Taxes and social security      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 7,539,938 R$ 7,145,147
Taxes and social security | Possible losses      
PROVISION FOR JUDICIAL LIABILITIES      
Number of lawsuits | lawsuit   766 782
Tax contingent liabilities | Income tax assessment - IRPJ/CSLL - Swap of industrial and forestry assets      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 2,351,673 R$ 2,296,032
Tax contingent liabilities | 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   728,567 712,531
Tax contingent liabilities | IRPJ/CSLL Partial Approval of Offset of 1997 Tax Loss      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   106,811 104,873
Tax loss offset approved by tax authorities R$ 83,000    
Difference of tax loss and owned to tax authorities R$ 51,000    
Tax contingent liabilities | Tax incentive - Agency for the Development of Northeastern Brazil ("ADENE")      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   129,701 127,391
Tax contingent liabilities | PIS/COFINS - Goods and services - 2009 to 2011      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   169,784 166,355
Tax contingent liabilities | Offsetting - IRRF - period 2000      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   111,437 109,903
Tax contingent liabilities | Tax assessment - Corporate Income Tax and Social Contribution      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   470,119 454,898
Tax contingent liabilities | Tax assessment - taxation on a universal basis, Year 2015      
PROVISION FOR JUDICIAL LIABILITIES      
Possible losses for which no provision was recorded   R$ 149,486 R$ 145,026