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2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Direct | Subsidiary 1 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Islands VII Corp.  
Interest in subsidiaries 100.00% 100.00%
Core business Financial transactions  
Direct | Subsidiary 2 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Islands XI Corp.  
Interest in subsidiaries 100.00% 100.00%
Core business Financial transactions  
Direct | Subsidiary 3 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Islands XII Corp.  
Interest in subsidiaries 100.00% 100.00%
Core business Financial transactions  
Direct | Subsidiary 4 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [1] CSN Minerals S.L.U.  
Interest in subsidiaries [1] 100.00% 100.00%
Core business [1] Equity interests  
Direct | Subsidiary 5 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [1] CSN Export Europe, S.L.U.  
Interest in subsidiaries [1] 100.00% 100.00%
Core business [1] Financial transactions and Equity interests  
Direct | Subsidiary 6 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [1] CSN Metals S.L.U.  
Interest in subsidiaries [1] 100.00% 100.00%
Core business [1] Equity interests and Financial transactions  
Direct | Subsidiary 7 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [1] CSN Americas S.L.U.  
Interest in subsidiaries [1] 100.00% 100.00%
Core business [1] Equity interests and Financial transactions  
Direct | Subsidiary 8 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Steel S.L.U.  
Interest in subsidiaries 100.00% 100.00%
Core business Equity interests and Financial transactions  
Direct | Subsidiary 9 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [2] TdBB S.A  
Interest in subsidiaries [2] 100.00% 100.00%
Core business [2] Equity interests  
Direct | Subsidiary 10 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Sepetiba Tecon S.A.  
Interest in subsidiaries 99.99% 99.99%
Core business Port services  
Direct | Subsidiary 11 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Minérios Nacional S.A.  
Interest in subsidiaries 99.99% 99.99%
Core business Mining and Equity interests  
Direct | Subsidiary 12 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Companhia Florestal do Brasil  
Interest in subsidiaries 99.99% 99.99%
Core business Reforestation  
Direct | Subsidiary 13 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Estanho de Rondônia S.A.  
Interest in subsidiaries 99.99% 99.99%
Core business Tin Mining  
Direct | Subsidiary 14 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Companhia Metalúrgica Prada  
Interest in subsidiaries 99.99% 99.99%
Core business Manufacture of containers and distribution of steel products  
Direct | Subsidiary 15 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [2] CSN Gestão de Recursos Financeiros Ltda.  
Interest in subsidiaries [2] 99.99% 99.99%
Core business [2] Management of funds and securities portfolio  
Direct | Subsidiary 16 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Mineração S.A.  
Interest in subsidiaries 87.52% 87.52%
Core business Mining and Equity interests  
Direct | Subsidiary 17 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [3] CSN Energia S.A.  
Interest in subsidiaries [3] 99.99% 100.00%
Core business [3] Sale of electric power  
Direct | Subsidiary 18 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name FTL - Ferrovia Transnordestina Logística S.A.  
Interest in subsidiaries 90.78% 90.78%
Core business Railroad logistics  
Direct | Subsidiary 19 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Nordeste Logística S.A.  
Interest in subsidiaries 99.99% 99.99%
Core business Port services  
Direct | Subsidiary 20 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [4] CGPAR - Construção Pesada S.A. (3)  
Interest in subsidiaries [4] 100.00%
Core business [4] Mining support services and Equity interests  
Direct | Joint Operation 1 | Proportionate Consolidation    
Disclosure of subsidiaries [line items]    
Joint operations name Itá Energética S.A.  
Interest in joint operations 48.75% 48.75%
Core business Electric power generation  
Direct | Joint Operation 2 | Proportionate Consolidation    
Disclosure of subsidiaries [line items]    
Joint operations name Consórcio da Usina Hidrelétrica de Igarapava  
Interest in joint operations 17.92% 17.92%
Core business Electric power generation  
Direct | Joint Venture 1 | Equity Method    
Disclosure of subsidiaries [line items]    
Joint ventures name MRS Logistica S.A.  
Interest in joint ventures 18.64% 18.64%
Core business Railroad transportation  
Direct | Joint Venture 2 | Equity Method    
Disclosure of subsidiaries [line items]    
Joint ventures name Aceros Del Orinoco S.A.  
Interest in joint ventures 31.82% 31.82%
Core business Dormant company  
Direct | Joint Venture 3 | Equity Method    
Disclosure of subsidiaries [line items]    
Joint ventures name CBSI - Companhia Brasileira de Serviços de Infraestrutura  
Interest in joint ventures 50.00% 50.00%
Core business Equity interests and product sales and iron ore  
Direct | Joint Venture 4 | Equity Method    
Disclosure of subsidiaries [line items]    
Joint ventures name Transnordestina Logística S.A.  
Interest in joint ventures 46.30% 49.02%
Core business Railroad logistics  
Direct | Associate 1 | Equity Method    
Disclosure of subsidiaries [line items]    
Associates name Arvedi Metalfer do Brasil S.A.  
Interest in associates 20.00% 20.00%
Core business Metallurgy Equity interests  
Indirect | Subsidiary 1 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Companhia Siderúrgica Nacional LLC  
Interest in subsidiaries 100.00% 100.00%
Core business Steel  
Indirect | Subsidiary 2 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [5] CSN Europe Lda.  
Interest in subsidiaries [5] 100.00%
Core business [5] Financial transactions, product sales and Equity interests  
Indirect | Subsidiary 3 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [5] CSN Ibéria Lda.  
Interest in subsidiaries [5] 100.00%
Core business [5] Financial transactions, product sales and Equity interests  
Indirect | Subsidiary 4 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Lusosider Projectos Siderúrgicos S.A.  
Interest in subsidiaries 99.94% 99.94%
Core business Equity interests and product sales  
Indirect | Subsidiary 5 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Lusosider Aços Planos, S. A.  
Interest in subsidiaries 99.99% 99.99%
Core business Steel and Equity interests  
Indirect | Subsidiary 6 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Resources S.A.  
Interest in subsidiaries 100.00% 100.00%
Core business Financial transactions and Equity interests  
Indirect | Subsidiary 7 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [3] Companhia Brasileira de Latas  
Interest in subsidiaries [3] 99.99% 100.00%
Core business [3] Sale of cans and containers in general and Equity interests  
Indirect | Subsidiary 8 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Companhia de Embalagens Metálicas MMSA  
Interest in subsidiaries 99.67% 99.67%
Core business Production and sale of cans and related activities  
Indirect | Subsidiary 9 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Companhia de Embalagens Metálicas - MTM  
Interest in subsidiaries 99.67% 99.67%
Core business Production and sale of cans and related activities  
Indirect | Subsidiary 10 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Steel Holdings 1, S.L.U.  
Interest in subsidiaries 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
Indirect | Subsidiary 11 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Productos Siderúrgicos S.L.  
Interest in subsidiaries 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
Indirect | Subsidiary 12 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Stalhwerk Thüringen GmbH  
Interest in subsidiaries 100.00% 100.00%
Core business Production and sale of long steel and related activities  
Indirect | Subsidiary 13 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [2] CSN Steel Sections UK Limited  
Interest in subsidiaries [2] 100.00% 100.00%
Core business [2] Sale of long steel  
Indirect | Subsidiary 14 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Steel Sections Polska Sp.Z.o.o  
Interest in subsidiaries 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
Indirect | Subsidiary 15 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Asia Limited  
Interest in subsidiaries 100.00% 100.00%
Core business Commercial representation  
Indirect | Subsidiary 16 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [6] CSN Mining Holding, S.L  
Interest in subsidiaries [6] 87.52% 87.52%
Core business [6] Financial transactions, product sales and Equity interests  
Indirect | Subsidiary 17 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Mining GmbH  
Interest in subsidiaries 87.52% 87.52%
Core business Financial transactions, product sales and Equity interests  
Indirect | Subsidiary 18 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name CSN Mining Asia Limited  
Interest in subsidiaries 87.52% 87.52%
Core business Commercial representation  
Indirect | Subsidiary 19 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name Aceros México CSN  
Interest in subsidiaries 100.00% 100.00%
Core business Commercial representation,sale of steel and related activity  
Indirect | Subsidiary 20 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [7] Lusosider Ibérica S.A.  
Interest in subsidiaries [7] 99.94%  
Core business [7] Steel, commercial and industrial activities and equity interests  
Indirect | Subsidiary 21 | Full Consolidation    
Disclosure of subsidiaries [line items]    
Subsidiary name [7] CSN Mining Portugal, Unipessoal Lda.  
Interest in subsidiaries [7] 87.52%  
Core business [7] Sale and commercial representation  
Indirect | Joint Venture 1 | Equity Method    
Disclosure of subsidiaries [line items]    
Joint ventures name MRS Logistica S.A.  
Interest in joint ventures 16.30% 16.30%
Core business Railroad transportation  
[1] On February 6, 2018, the Spanish commercial registry recognized the merger by absorption of the companies by CSN Steel, S.L.U., date from which the companies were considered legally extinct. In addition, before third parties and for the purposes of commercial law, the merger is retroactive to the date of December 28, 2017;
[2] They are Dormant Companies, therefore they do not appear in the note 8.a, where is disclosed business information under the equity method and classified as available for sale.
[3] Transfer of 1 share in August 2017;
[4] Company sold to the CSN Mineracao and in August 2017 was incorporated by the same subsidiary;
[5] Companies liquidated in July 2017;
[6] New corporate name of Namisa International Minerios SLU, amended in September 2017;
[7] Companies constituted in 2017;