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TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Judicial Deposits (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Jan. 07, 2021
Nov. 18, 2020
Jun. 29, 2020
May 27, 2020
Apr. 13, 2020
Dec. 31, 2019
Dec. 18, 2019
Sep. 16, 2019
Jul. 19, 2019
Disclosure of other provisions [line items]                    
Tax R$ 1,597,995           R$ 1,837,967      
Labor 95,234           113,379      
Civil 132,562           40,369      
Judicial deposits 1,825,791           R$ 1,991,715      
Balance judicial deposits 1,504,582                  
Amount of deposits for which replacement has been requested           R$ 1,700,000        
Final and unappealable decision, first lawsuit                    
Disclosure of other provisions [line items]                    
Amount of undue payments before proposed action                   R$ 122,000
Amount of undue payments before proposed action, net of related expenses                   R$ 79,000
Right to withdraw judicial deposits                 R$ 179,000  
Procedure to collect differences, amount   R$ 100,000                
Final and unappealable decision, second lawsuit                    
Disclosure of other provisions [line items]                    
Amount of undue payments before proposed action               R$ 280,000    
Amount of undue payments before proposed action, net of related expenses               R$ 185,000    
Right to withdraw judicial deposits         R$ 189,000          
Final and unappealable decision, third lawsuit                    
Disclosure of other provisions [line items]                    
Amount of undue payments before proposed action       R$ 147,000            
Amount of undue payments before proposed action, net of related expenses       135,000            
Right to withdraw judicial deposits       R$ 193,000            
Final and unappealable decision, fourth lawsuit                    
Disclosure of other provisions [line items]                    
Amount of undue payments before proposed action     R$ 940,000              
Amount of undue payments before proposed action, net of related expenses     902,000              
Right to withdraw judicial deposits     R$ 3,000              
Lawsuits for the repetition of undue payments awaiting unappealable decision                    
Disclosure of other provisions [line items]                    
Amount of undue payments before proposed action 773,000                  
Judicial deposits raised 1,300,000                  
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