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INVENTORIES - Components of inventory at net realizable value (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
INVENTORIES    
Finished products R$ 3,302,569 R$ 3,985,964
Work in progress 1,426,607 1,688,794
Raw materials 1,611,334 2,296,074
Storeroom supplies 974,412 784,517
Imports in transit 384,123 426,044
Allowance for adjustments to net realizable value (39,308) (13,704)
Total current inventories R$ 7,659,737 R$ 9,167,689