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RECOVERABLE TAXES - Rollforward of provision for loss (Details) - BRL (R$)
R$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
ICMS    
Beginning balance R$ (1,164,782) R$ (1,304,329)
Addition (33,674) (64,107)
Write-off 141 57,254
Reversal 10,279 146,400
Ending balance (1,188,036) (1,164,782)
PIS and COFINS    
Beginning balance 0 (21,132)
Write-off   21,132
Ending balance   0
Total    
Beginning balance (1,164,782) (1,325,461)
Addition (33,674) (64,107)
Write-off 141 78,386
Reversal 10,279 146,400
Ending balance R$ (1,188,036) R$ (1,164,782)