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TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Provisions (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Other provisions disclosures        
Provision for tax, civil, and labor liabilities R$ 827,883 R$ 770,305    
Reversal of provision for tax liabilities, net 929,711      
Reversal of interest on provision for tax liabilities, net 369,819      
Judicial deposits, ICMS legal proceeding   1,763,085    
Legal proceedings provision        
Other provisions disclosures        
Provision for tax, civil, and labor liabilities 827,883 770,305 R$ 2,239,226 R$ 1,904,730
Reversal of provision for tax liabilities, net (929,711)      
Reversal of interest on provision for tax liabilities, net (369,819)      
Tax Provisions        
Other provisions disclosures        
Provision for tax, civil, and labor liabilities 257,621 268,009    
Labor provisions        
Other provisions disclosures        
Provision for tax, civil, and labor liabilities 517,329 449,350    
Civil provisions        
Other provisions disclosures        
Provision for tax, civil, and labor liabilities R$ 52,933 R$ 52,946