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TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Judicial Deposits (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Dec. 31, 2017
BRL (R$)
Dec. 18, 2019
BRL (R$)
Sep. 16, 2019
BRL (R$)
Jul. 19, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Mar. 15, 2017
Vote
Mar. 14, 2017
Vote
Disclosure of other provisions [line items]                
Tax R$ 1,837,967         R$ 1,963,859    
Labor 113,379         126,620    
Civil 40,369         44,935    
Judicial deposits 1,991,715         R$ 2,135,414    
Balance judicial deposits R$ 1,650,976              
Number of Votes under Judicial Deposits Lawsuits | Vote             4 6
Reversal of provision for tax liabilities, net   R$ 929,711            
Reversal of interest on provision for tax liabilities, net   369,819            
Number of lawsuits final 2              
Amount of undue payments before proposed action     R$ 280,000   R$ 122,000      
Right to Withdraw Judicial Deposits     R$ 187,000 R$ 179,000        
Legal proceedings provision                
Disclosure of other provisions [line items]                
Reversal of provision for tax liabilities, net   (929,711)            
Reversal of interest on provision for tax liabilities, net   R$ 369,819