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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, 2021
Sep. 30, 2021
Jul. 14, 2021
Jun. 30, 2021
Mar. 25, 2021
Feb. 24, 2021
Dec. 31, 2020
Nov. 18, 2020
Jun. 29, 2020
May 27, 2020
Dec. 18, 2019
Sep. 16, 2019
Jul. 19, 2019
Disclosure of other provisions [line items]                          
Tax R$ 1,449,699           R$ 1,597,995            
Labor 73,709           95,234            
Civil 135,971           132,562            
Judicial deposits 1,659,379           R$ 1,825,791            
Balance judicial deposits 1,354,340                        
Amount of undue payments before proposed action       R$ 683,000   R$ 73,500              
Amount of undue payments before proposed action, net of related expenses       R$ 643,000                  
Procedure to collect differences, amount   R$ 326,000                      
Amount of deposits for which replacement has been requested 1,700,000                        
Recovery of Tax Credits Arising From Law suits 1,200,000                        
Other operating income lawsuits 393,300                        
Tax Credits Monetary Update line 788,700                        
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  
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$ 198,000        
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          
Final and unappealable decision, fifth lawsuit                          
Disclosure of other provisions [line items]                          
Amount of undue payments before proposed action           73,500              
Amount of undue payments before proposed action, net of related expenses           R$ 45,800              
Final and unappealable decision, sixth lawsuit                          
Disclosure of other provisions [line items]                          
Amount of undue payments before proposed action         R$ 5,700                
Amount of undue payments before proposed action, net of related expenses         R$ 3,600                
Final and unappealable decision, seventh lawsuit                          
Disclosure of other provisions [line items]                          
Amount of undue payments before proposed action     R$ 237,000                    
Amount of undue payments before proposed action, net of related expenses     R$ 230,000                    
Eighth and ninth actions for repetition                          
Disclosure of other provisions [line items]                          
Amount of undue payments before proposed action 683,000                        
Amount of undue payments before proposed action, net of related expenses R$ 643,000