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18 RELATED-PARTY BALANCES AND TRANSACTIONS (Details 6)
€ in Thousands, R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Disclosure of transactions between related parties [line items]            
Borrowings R$ 15,695,779     R$ 15,565,802    
Tax foreclosure 41,004     38,498    
Others 10,857     22,093    
Total 16,143,493     15,626,393    
Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Borrowings 12,033,973     11,976,657    
Total 12,429,826     11,976,657    
Guarantees [Member] | Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Borrowings 3,661,806     3,589,145    
Tax foreclosure 41,004     38,498    
Others 10,857     22,093    
Total R$ 3,713,667     3,649,736    
Guarantees [Member] | Foreign Currency [Member] | United States of America, Dollars            
Disclosure of transactions between related parties [line items]            
Borrowings | $   $ 2,958,603     $ 2,950,000  
Total | $   2,958,603     2,950,000  
Guarantees [Member] | Foreign Currency [Member] | Euro Member Countries, Euro            
Disclosure of transactions between related parties [line items]            
Borrowings | €     € 24,000     € 123,000
Total | €     24,000     123,000
Guarantees [Member] | Transnordestina Logistica S.A [Member] | Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Maturities Up to 09/19/2056 and indefinite          
Borrowings R$ 2,428,194     2,108,917    
Tax foreclosure 37,406     35,336    
Others 8,702     8,231    
Total R$ 2,474,302     2,152,484    
Guarantees [Member] | FTL - Ferrovia Transnordestina [Member] | Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Maturities Up to 04/01/2021          
Borrowings R$ 43,118     62,407    
Total R$ 43,118     62,407    
Guarantees [Member] | Cia Metalurgica Prada [Member] | Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Maturities Indefinite          
Tax foreclosure R$ 457     333    
Others 235     11,942    
Total R$ 692     12,275    
Guarantees [Member] | CSN Energia [Member] | Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Maturities Up to 11/26/2023 and indefinite          
Tax foreclosure R$ 3,141     2,829    
Others 1,920     1,920    
Total R$ 5,061     4,749    
Guarantees [Member] | CSN Mineracao [Member] | Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Maturities Up to 12/21/2024          
Borrowings R$ 1,184,048     1,407,363    
Total R$ 1,184,048     1,407,363    
Guarantees [Member] | Estanho de Rondonia [Member] | Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Maturities 7/15/2022          
Borrowings R$ 1,902     3,153    
Total R$ 1,902     3,153    
Guarantees [Member] | Minerios Nacional S.A. [Member] | Local Currency [Member]            
Disclosure of transactions between related parties [line items]            
Maturities Up to 09/10/2021          
Borrowings R$ 4,544     7,305    
Total R$ 4,544     R$ 7,305    
Guarantees [Member] | CSN Islands XI [Member] | Foreign Currency [Member] | United States of America, Dollars            
Disclosure of transactions between related parties [line items]            
Maturities 9/21/2019          
Borrowings | $       547,094  
Total | $       547,094  
Guarantees [Member] | CSN Islands XII [Member] | Foreign Currency [Member] | United States of America, Dollars            
Disclosure of transactions between related parties [line items]            
Maturities Perpetual          
Borrowings | $   1,000,000     1,000,000  
Total | $   1,000,000     1,000,000  
Guarantees [Member] | CSN Resources [Member] | Foreign Currency [Member] | United States of America, Dollars            
Disclosure of transactions between related parties [line items]            
Maturities Up to 04/17/2026          
Borrowings | $   1,958,603     1,402,906  
Total | $   $ 1,958,603     $ 1,402,906  
Guarantees [Member] | CSN Steel S.L. [Member] | Foreign Currency [Member] | Euro Member Countries, Euro            
Disclosure of transactions between related parties [line items]            
Maturities 1/31/2020          
Borrowings | €     24,000     48,000
Total | €     24,000     48,000
Guarantees [Member] | Lusosider Acos Planos [Member] | Foreign Currency [Member] | Euro Member Countries, Euro            
Disclosure of transactions between related parties [line items]            
Maturities Indefinite          
Borrowings | €         75,000
Total | €         € 75,000