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PROVISION FOR JUDICIAL LIABILITIES - Changes in the provision according to the nature of the proceedings for probable losses (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
lawsuit
Dec. 31, 2019
BRL (R$)
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance R$ 3,686,801  
Ending balance 3,452,871 R$ 3,686,801
Probable loss    
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance 3,686,801 351,270
Business combination   389,593
Payments (81,563) (40,360)
Write-off (293,761) (73,039)
Additions 101,950 3,009,576
Monetary adjustment 39,444 49,761
Ending balance 3,452,871 3,686,801
Taxes and social security    
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance 3,176,503  
Ending balance 2,984,230 3,176,503
Taxes and social security | Probable loss    
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance 492,413 296,869
Business combination   139,462
Payments (23,162) (34)
Write-off (23,106) (3,875)
Additions 20,560 46,603
Monetary adjustment 9,365 13,388
Ending balance R$ 476,070 492,413
Administrative proceedings and tax lawsuits | lawsuit 51  
Taxes | Possible losses and remote losses    
PROVISION FOR JUDICIAL LIABILITIES    
Ending balance R$ 2,508,162  
Labor    
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance 227,139  
Ending balance 217,180 227,139
Labor | Probable loss    
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance 227,139 50,869
Business combination   185,157
Payments (43,783) (34,794)
Write-off (52,333) (55,730)
Additions 64,053 50,521
Monetary adjustment 22,104 31,116
Ending balance R$ 217,180 227,139
Number of lawsuits | lawsuit 1,010  
Civil and environment    
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance R$ 283,159  
Ending balance 251,461 283,159
Civil and environment | Probable loss    
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance 64,897 3,532
Business combination   64,974
Payments (14,618) (5,532)
Write-off (25,223) (13,434)
Additions 17,337 10,100
Monetary adjustment 7,975 5,257
Ending balance R$ 50,368 64,897
Number of lawsuits | lawsuit 58  
Civil and environment | Possible losses and remote losses    
PROVISION FOR JUDICIAL LIABILITIES    
Ending balance R$ 201,091  
Contingent liabilities | Probable loss    
PROVISION FOR JUDICIAL LIABILITIES    
Beginning balance 2,902,352  
Write-off (193,099)  
Additions   2,902,352
Ending balance R$ 2,709,253 R$ 2,902,352