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34. SUBSEQUENT EVENTS (Details Narrative)
R$ / shares in Units, R$ in Thousands, $ in Thousands
Feb. 22, 2021
BRL (R$)
Feb. 17, 2021
BRL (R$)
R$ / shares
shares
Jan. 31, 2021
USD ($)
shares
Jan. 31, 2021
BRL (R$)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Disclosure of non-adjusting events after reporting period [line items]              
Statutory reserve           R$ 32,720 R$ 32,720
Debt           R$ 35,370,611  
USD              
Disclosure of non-adjusting events after reporting period [line items]              
Debt | $         $ 24,901,552    
Event after reporting period [member]              
Disclosure of non-adjusting events after reporting period [line items]              
Statutory reserve R$ 1,500,000            
Increase in the capital R$ 6,040,000            
Event after reporting period [member] | CSN Mineracao SA [member]              
Disclosure of non-adjusting events after reporting period [line items]              
Share capital   R$ 5,430,057,060          
Ratio of share split   01:30          
Event after reporting period [member] | CSN Mineracao SA [member] | Primary Distribution [member]              
Disclosure of non-adjusting events after reporting period [line items]              
Number of share issued | shares   161,189,078          
Number of share issued, value   R$ 1,370,000          
Share price (in R$ per share) | R$ / shares   R$ 8.50          
Event after reporting period [member] | CSN Mineracao SA [member] | Secondary Distribution [member]              
Disclosure of non-adjusting events after reporting period [line items]              
Number of share issued | shares   372,749,743          
Number of share issued, value   R$ 2,785,000          
Share price (in R$ per share) | R$ / shares   R$ 8.50          
Event after reporting period [member] | CSN Mineracao SA [member] | Top of range [member]              
Disclosure of non-adjusting events after reporting period [line items]              
Percentage of additional shares held by the current shareholders   20.00%          
Percentage of additional shares held by the majority shareholder   15.00%          
Event after reporting period [member] | NCEs [member]              
Disclosure of non-adjusting events after reporting period [line items]              
Debt amortized       R$ 315,000      
Event after reporting period [member] | Export prepayment contracts [member] | USD              
Disclosure of non-adjusting events after reporting period [line items]              
Debt | $     $ 265,000        
Debt maturity year     2022 2022      
Debt reprofiling | $     $ 79,000        
Debt maturity year postponed     2023 2023      
Event after reporting period [member] | Debentures [member]              
Disclosure of non-adjusting events after reporting period [line items]              
Buy back of debentures, shares | shares     450,000 450,000      
Buy back of debentures, value       R$ 391,000      
Percentage of buy back of debentures     23.00% 23.00%