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SHAREHOLDERS' EQUITY - Result absorption (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
SHAREHOLDERS' EQUITY    
Result absorption R$ (2,816,393) R$ 318,339
Reserve balances 317,144 3,080,619
Realization of deemed cost, net of taxes    
SHAREHOLDERS' EQUITY    
Result absorption (52,918) (68,424)
Tax incentives    
SHAREHOLDERS' EQUITY    
Result absorption R$ (684,563) 288,557
Reserve balances   684,563
Special statutory reserve    
SHAREHOLDERS' EQUITY    
Percentage of limited balance of share capital 20.00%  
Result absorption R$ (242,612) 7,882
Reserve balances   242,612
Legal Reserve    
SHAREHOLDERS' EQUITY    
Percentage of limited balance of share capital 20.00%  
Result absorption R$ (105,671) 15,917
Reserve balances R$ 317,144 422,815
Reserve for capital increase    
SHAREHOLDERS' EQUITY    
Percentage of limited balance of share capital 80.00%  
Result absorption R$ (1,730,629) 70,940
Reserve balances   1,730,629
Minimum mandatory dividends    
SHAREHOLDERS' EQUITY    
Result absorption   R$ 3,466