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IMPAIRMENT OF ASSETS (Details)
R$ in Thousands
12 Months Ended
Dec. 31, 2021
BRL (R$)
segment
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Impairment of assets      
Impairment R$ 0 R$ (411,925) 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 five    
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 Operation      
Impairment of assets      
Impairment   R$ (342,355)  
Perpetuity growth rate 3.00% 3.00%  
Pre-tax discount rate 9.50% 8.25%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value R$ 5,769,000 R$ 6,202,000  
North America Operation | Discount rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 4,337,000 4,589,000  
North America Operation | Perpetuity growth rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value R$ 4,679,000 4,914,000  
Special Steel Operation      
Impairment of assets      
Impairment   R$ (69,570)  
Perpetuity growth rate 3.00% 3.00%  
Pre-tax discount rate 10.50% 8.75%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value R$ 4,238,000 R$ 2,509,000  
Special Steel Operation | Discount rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 3,301,000 1,568,000  
Special Steel Operation | Perpetuity growth rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value R$ 3,545,000 R$ 1,754,000  
South America Operation      
Impairment of assets      
Perpetuity growth rate 3.00% 3.00%  
Pre-tax discount rate 15.00% 11.25%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value R$ 2,248,000 R$ 4,141,000  
South America Operation | Discount rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 2,057,000 3,757,000  
South America Operation | Perpetuity growth rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value R$ 2,135,000 R$ 3,867,000  
Brazil Operation      
Impairment of assets      
Perpetuity growth rate 3.00% 3.00%  
Pre-tax discount rate 11.25% 9.75%  
Amount by which unit's recoverable amount is (below) exceeds its carrying value R$ 8,994,000 R$ 13,424,000  
Brazil Operation | Discount rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value 7,582,000 11,348,000  
Brazil Operation | Perpetuity growth rate      
Impairment of assets      
Sensitivity analysis, amount above (below) book value R$ 7,962,000 R$ 11,809,000