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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in the tax, labor and civil provisions :      
Balance at the beginning of the year R$ 770,305    
Reversal of contingent liabilities, net     R$ 929,711
Reversal of monetary update of contingent liabilities     (369,819)
Balance at the end of the year 809,299 R$ 770,305  
Legal proceedings provision      
Changes in the tax, labor and civil provisions :      
Balance at the beginning of the year 770,305 827,883 2,239,226
Additions 249,868 177,684 527,543
Monetary correction 70,788 85,626 77,257
Reversal of contingent liabilities, net     (929,711)
Reversal of monetary update of contingent liabilities     (369,819)
Reversal of accrued amounts (282,239) (319,719) (715,081)
Foreign exchange effect on provisions in foreign currency 577 (1,169) (201)
Loss of control by joint venture creation     (1,331)
Balance at the end of the year R$ 809,299 R$ 770,305 R$ 827,883