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6. INVENTORIES (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
InventoriesLineItems [Line Items]    
(-) Provision for losses R$ (134,553) R$ (157,754)
Inventoy, net 5,282,750 5,039,560
Finished Goods [Member]    
InventoriesLineItems [Line Items]    
Inventory gross 1,691,842 1,501,969
Work In Progress [Member]    
InventoriesLineItems [Line Items]    
Inventory gross 1,294,369 1,217,611
Raw Materials [Member]    
InventoriesLineItems [Line Items]    
Inventory gross 1,493,129 1,584,140
Spare Parts [Member]    
InventoriesLineItems [Line Items]    
Inventory gross 857,402 902,135
Advances To Suppliers [Member]    
InventoriesLineItems [Line Items]    
Inventory gross R$ 35,828 R$ 36,192