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INVENTORIES - Summary of balances (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
INVENTORIES    
Work in process R$ 81,465 R$ 75,377
Raw materials 1,450,507 1,047,433
Spare parts and other 508,444 488,410
Inventories 4,009,335 4,685,595
Pulp | Domestic (Brazil)    
INVENTORIES    
Finished goods 553,229 575,335
Pulp | Foreign    
INVENTORIES    
Finished goods 1,102,994 2,229,206
Paper | Domestic (Brazil)    
INVENTORIES    
Finished goods 225,058 199,635
Paper | Foreign    
INVENTORIES    
Finished goods R$ 87,638 R$ 70,199