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INCOME AND SOCIAL CONTRIBUTION TAXES - Reconciliation of effects of income tax and social contribution on profit or loss (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of the effects of income tax and social contribution on profit or loss      
Loss before taxes R$ (17,642,129) R$ (4,097,203)  
Income tax and social contribution benefit (expense) at statutory nominal rate of 34% R$ 5,998,324 R$ 1,393,049  
Tax rate 34.00% 34.00%  
Tax effect on permanent differences      
Taxation (difference) on profit of wholly-owned subsidiaries abroad R$ 1,373,845 R$ (24,933)  
Equity method 12,288 10,878  
Thin capitalisation (675,356) (95,003)  
Credit related to Reintegrate Program 6,278 4,515  
Tax incentives applicable to income tax 10,668 18,919  
Director bonus (7,677) (43,913)  
Offset income tax abroad 72,890    
Merger of subsidiaries 67,311    
Donations / Fines - Other 68,623 18,949  
Income and social contribution benefits (expenses) on the period 6,927,194 1,282,461 R$ (154,516)
Income tax      
Current (173,322) (220,311)  
Deferred 5,225,655 1,093,200  
Total income Tax 5,052,333 872,889  
Social Contribution      
Current (8,604) (25,799)  
Deferred 1,883,465 435,371  
Total Social Contribution 1,874,861 409,572  
Income and social contribution benefits (expenses) on the period R$ 6,927,194 R$ 1,282,461 R$ (154,516)
Effective rate of income and social contribution tax expenses 39.27% 31.30%