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IMPAIRMENT OF ASSETS (Details)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
BRL (R$)
segment
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Impairment of assets      
Impairment of property, plant and equipment R$ 411,925 R$ 0 R$ 0
Impairment of goodwill R$ 0 R$ 0 R$ 0
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 R$ 342,355    
Perpetuity growth rate 3.00% 3.00%  
Pre-tax discount rate 8.25% 10.00%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value R$ 6,202,000 R$ 2,690,000  
North America | Discount rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 4,589,000 1,884,000  
North America | Perpetuity growth rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 4,914,000 R$ 2,098,000  
Special Steel      
Impairment of assets      
Impairment of property, plant and equipment R$ 69,570    
Perpetuity growth rate 3.00% 3.00%  
Pre-tax discount rate 8.75% 10.50%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value R$ 2,509,000 R$ 2,813,000  
Special Steel | Discount rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 1,568,000 2,207,000  
Special Steel | Perpetuity growth rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value R$ 1,754,000 R$ 2,369,000  
South America      
Impairment of assets      
Perpetuity growth rate 3.00% 3.00%  
Pre-tax discount rate 11.25% 14.25%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value R$ 4,141,000 R$ 521,000  
South America | Discount rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 3,757,000 414,000  
South America | Perpetuity growth rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value R$ 3,867,000 R$ 455,000  
Brazil      
Impairment of assets      
Perpetuity growth rate 3.00% 3.00%  
Pre-tax discount rate 9.75% 11.25%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value R$ 13,424,000 R$ 4,015,000  
Brazil | Discount rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 11,348,000 2,810,000  
Brazil | Perpetuity growth rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value R$ 11,809,000 R$ 3,115,000