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11. BORROWINGS, FINANCING AND DEBENTURES (Details 5) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 14,948,054 R$ 14,737,550
Tax foreclosure 25,376 26,169
Other 58,714 55,640
Total 15,032,144 14,819,359
Total in US$    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,950,000 2,950,000
Total 2,950,000 2,950,000
Total in EUR    
Disclosure of detailed information about borrowings [line items]    
Borrowings 145,000 145,000
Total 145,000 145,000
Total in R$    
Disclosure of detailed information about borrowings [line items]    
Borrowings 4,613,905 4,624,637
Tax foreclosure 25,376 26,169
Other 58,714 55,640
Total 4,697,995 4,706,446
Total in R$    
Disclosure of detailed information about borrowings [line items]    
Borrowings 10,334,149 10,112,913
Total R$ 10,334,149 10,112,913
Transnordestina Logisitca    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Up to 09/19/2056 and Indefinite  
Borrowings R$ 2,541,347 2,547,937
Tax foreclosure 22,214 23,007
Other 3,866 4,866
Total R$ 2,567,427 2,575,810
FTL - Ferrovia Transnordestina    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities 11/15/2020  
Borrowings R$ 69,405 76,700
Total R$ 69,405 76,700
Sepetiba Tecon    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Indefinite  
Other R$ 36,308 28,914
Total R$ 36,308 28,914
Cia Metalurgica Prada    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Indefinite  
Tax foreclosure R$ 333 333
Other 18,540 19,340
Total R$ 18,873 19,673
CSN Energia    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Indefinite  
Tax foreclosure R$ 2,829 2,829
Total R$ 2,829 2,829
CSN Mineracao    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities 09/22/2022  
Borrowings R$ 2,000,000 2,000,000
Other   2,520
Total R$ 2,000,000 2,002,520
Estanho de Rondonia    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities 07/15/2022  
Borrowings R$ 3,153  
Total R$ 3,153  
CSN Islands XI    
Disclosure of detailed information about borrowings [line items]    
Currency US$  
Maturities 09/21/2019  
CSN Islands XI | USD    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 750,000 750,000
Total R$ 750,000 750,000
CSN Islands XII    
Disclosure of detailed information about borrowings [line items]    
Currency US$  
Maturities Perpetual  
CSN Islands XII | USD    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 1,000,000 1,000,000
Total R$ 1,000,000 1,000,000
CSN Resources    
Disclosure of detailed information about borrowings [line items]    
Currency US$  
Maturities 07/21/2020  
CSN Resources | USD    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 1,200,000 1,200,000
Total R$ 1,200,000 1,200,000
CSN Steel S.L.    
Disclosure of detailed information about borrowings [line items]    
Currency EUR  
Maturities 01/31/2020  
CSN Steel S.L. | EUR    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 120,000 120,000
Total R$ 120,000 120,000
Lusosider Acos Planos    
Disclosure of detailed information about borrowings [line items]    
Currency EUR  
Maturities Indefinite  
Lusosider Acos Planos | EUR    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 25,000 25,000
Total R$ 25,000 R$ 25,000