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12. BORROWINGS, FINANCING AND DEBENTURES (Details 5) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 15,565,802 R$ 14,948,054
Tax foreclosure 38,498 25,376
Other 22,093 58,714
Total 3,649,736 15,032,144
Total in US$    
Disclosure of detailed information about borrowings [line items]    
Borrowings 2,950,000 2,950,000
Total   2,950,000
Total in EUR    
Disclosure of detailed information about borrowings [line items]    
Borrowings 123,000 145,000
Total   145,000
Total in R$    
Disclosure of detailed information about borrowings [line items]    
Borrowings   4,613,905
Tax foreclosure   25,376
Other   58,714
Total   4,697,995
Total in R$    
Disclosure of detailed information about borrowings [line items]    
Borrowings 3,589,145 10,334,149
Total R$ 11,976,657 10,334,149
Transnordestina Logisitca    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Until 09/19/2056 and Indefinite  
Borrowings R$ 2,108,917 2,541,347
Tax foreclosure 35,336 22,214
Other 8,231 3,866
Total R$ 2,152,484 2,567,427
FTL - Ferrovia Transnordestina    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities 11/15/2020  
Borrowings R$ 62,407 69,405
Total R$ 62,407 69,405
Sepetiba Tecon    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Other   36,308
Total   36,308
Cia Metalurgica Prada    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Indefinite  
Tax foreclosure R$ 333 333
Other 11,942 18,540
Total R$ 12,275 18,873
CSN Energia    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Until 11/26/2023 and Undetermined  
Tax foreclosure R$ 2,829 2,829
Other 1,920  
Total R$ 4,749 2,829
CSN Mineracao    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Until 12/26/2024  
Borrowings R$ 1,407,363 2,000,000
Total R$ 1,407,363 2,000,000
Estanho de Rondonia    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities 07/15/2022  
Borrowings R$ 3,153 3,153
Total R$ 3,153 3,153
Nacional Minerios S.A.    
Disclosure of detailed information about borrowings [line items]    
Currency R$  
Maturities Until 09/10/2021  
Borrowings R$ 7,305  
Total R$ 7,305  
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$ 547,094 750,000
Total   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   1,000,000
CSN Resources    
Disclosure of detailed information about borrowings [line items]    
Currency US$  
Maturities Until 02/13/2023  
CSN Resources | USD    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 1,402,906 1,200,000
Total   1,200,000
CSN Steel S.L.    
Disclosure of detailed information about borrowings [line items]    
Currency EUR  
Maturities 1/31/2020  
CSN Steel S.L. | EUR    
Disclosure of detailed information about borrowings [line items]    
Borrowings R$ 48,000 120,000
Total   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$ 75,000 25,000
Total   R$ 25,000