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TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Changes in Provisions (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in the tax, labor and civil provisions :      
Balance at the beginning of the year R$ 809,299    
Balance at the end of the year 1,172,511 R$ 809,299  
Legal proceedings provision      
Changes in the tax, labor and civil provisions :      
Balance at the beginning of the year 809,299 770,305 R$ 827,883
Additions 559,513 249,868 177,684
Monetary correction 104,473 70,788 85,626
Reversal of contingent liabilities, net 929,711    
Reversal of monetary update of contingent liabilities (369,819)    
Reversal of accrued amounts (304,678) (282,239) (319,719)
Foreign exchange effect on provisions in foreign currency 3,904 577 (1,169)
Balance at the end of the year R$ 1,172,511 R$ 809,299 R$ 770,305