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IMPAIRMENT OF ASSETS (Details)
R$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
BRL (R$)
Dec. 31, 2019
BRL (R$)
segment
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Impairment of assets        
Total impairment of non-financial assets       R$ 1,114,807
Impairment of property, plant and equipment R$ 265,369 R$ 0 R$ 0  
Impairment of goodwill   R$ 0 R$ 0 R$ 849,438
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%  
Perpetuity growth rate        
Impairment of assets        
Sensitivity analysis, percent of decrease   0.50% 0.50%  
North America        
Impairment of assets        
Impairment of property, plant and equipment 220,090      
Impairment of goodwill 849,438      
Perpetuity growth rate   3.00% 3.00%  
Pre-tax discount rate   10.00% 11.00%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value   R$ 2,690,000 R$ (2,157,000)  
North America | Discount rate        
Impairment of assets        
Sensitivity analysis, amount above (below) book value   1,884,000 1,474,000  
North America | Perpetuity growth rate        
Impairment of assets        
Sensitivity analysis, amount above (below) book value   R$ 2,098,000 R$ 1,672,000  
South America        
Impairment of assets        
Perpetuity growth rate   3.00% 3.00%  
Pre-tax discount rate   14.25% 13.00%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value   R$ 521,000 R$ 730,000  
South America | Discount rate        
Impairment of assets        
Sensitivity analysis, amount above (below) book value   414,000 593,000  
South America | Perpetuity growth rate        
Impairment of assets        
Sensitivity analysis, amount above (below) book value   R$ 455,000 R$ 640,000  
Brazil        
Impairment of assets        
Impairment of property, plant and equipment R$ 45,279      
Perpetuity growth rate   3.00% 3.00%  
Pre-tax discount rate   11.25% 12.50%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value   R$ 4,015,000 R$ 3,924,000  
Brazil | Discount rate        
Impairment of assets        
Sensitivity analysis, amount above (below) book value   2,810,000 3,048,000  
Brazil | Perpetuity growth rate        
Impairment of assets        
Sensitivity analysis, amount above (below) book value   R$ 3,115,000 R$ 3,318,000  
Special Steel        
Impairment of assets        
Perpetuity growth rate   3.00% 3.00%  
Pre-tax discount rate   10.50% 11.50%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value   R$ 2,813,000 R$ 3,019,000  
Special Steel | Discount rate        
Impairment of assets        
Sensitivity analysis, amount above (below) book value   2,207,000 2,483,000  
Special Steel | Perpetuity growth rate        
Impairment of assets        
Sensitivity analysis, amount above (below) book value   R$ 2,369,000 R$ 2,645,000