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IMPAIRMENT OF ASSETS (Details)
R$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
BRL (R$)
Dec. 31, 2018
BRL (R$)
segment
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
BRL (R$)
Impairment of assets          
Total impairment of non-financial assets       R$ 1,114,807 R$ 2,917,911
Impairment of property, plant and equipment   R$ 265,369 R$ 0 265,369  
Impairment of goodwill     R$ 0 R$ 849,438 R$ 2,678,582
Number of operating segments | segment     4    
Period for projecting the cash flows for the goodwill impairment test P5Y        
Discount rate          
Impairment of assets          
Sensitivity analysis, percent of increase   0.50% 0.50% 0.50%  
Perpetuity growth rate          
Impairment of assets          
Sensitivity analysis, percent of decrease   0.50% 0.50% 0.50%  
North America          
Impairment of assets          
Impairment of property, plant and equipment   R$ 220,090      
Impairment of goodwill   R$ 849,438      
Perpetuity growth rate   3.00% 3.00% 3.00%  
Pre-tax discount rate   13.60% 13.80% 13.60%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value   R$ (849,000) R$ 2,157 R$ (849,000)  
North America | Discount rate          
Impairment of assets          
Sensitivity analysis, amount above (below) book value   (506,000) 1,474,000 (506,000)  
North America | Perpetuity growth rate          
Impairment of assets          
Sensitivity analysis, amount above (below) book value   R$ (310,000) R$ 1,672,000 R$ (310,000)  
South America          
Impairment of assets          
Perpetuity growth rate   3.00% 3.00% 3.00%  
Pre-tax discount rate   14.70% 17.10% 14.70%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value   R$ 437,000 R$ 730,000 R$ 437,000  
South America | Discount rate          
Impairment of assets          
Sensitivity analysis, amount above (below) book value   265,000 593,000 265,000  
South America | Perpetuity growth rate          
Impairment of assets          
Sensitivity analysis, amount above (below) book value   318,000 R$ 640,000 R$ 318,000  
Brazil          
Impairment of assets          
Impairment of property, plant and equipment   R$ 45,279      
Perpetuity growth rate   3.00% 3.00% 3.00%  
Pre-tax discount rate   15.20% 16.40% 15.20%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value   R$ 1,747,000 R$ 3,924,000 R$ 1,747,000  
Brazil | Discount rate          
Impairment of assets          
Sensitivity analysis, amount above (below) book value   999,000 3,048,000 999,000  
Brazil | Perpetuity growth rate          
Impairment of assets          
Sensitivity analysis, amount above (below) book value   R$ 1,254,000 R$ 3,318,000 R$ 1,254,000  
Special Steel          
Impairment of assets          
Perpetuity growth rate   3.00% 3.00% 3.00%  
Pre-tax discount rate   13.10% 14.70% 13.10%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value   R$ 3,989,000 R$ 3,019,000 R$ 3,989,000  
Special Steel | Discount rate          
Impairment of assets          
Sensitivity analysis, amount above (below) book value   3,422,000 2,483,000 3,422,000  
Special Steel | Perpetuity growth rate          
Impairment of assets          
Sensitivity analysis, amount above (below) book value   R$ 3,596,000 R$ 2,645,000 R$ 3,596,000