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2 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Number of shares held by CSN (in units) 1,387,524,047 1,387,524,047
Direct [Member] | Ita Energetica S.A. [Member] | Joint Operation [member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Number of shares held by CSN (in units) 253,606,846  
Core business Electric power generation  
Companies, operation Itá Energética S.A.  
Equity interests (%), operation 48.75% 48.75%
Direct [Member] | Consorcio Da Usina Hidreletrica De Lgarapava [Member] | Joint Operation [member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Core business Electric power consortium  
Companies, operation Consórcio da Usina Hidrelétrica de Igarapava  
Equity interests (%), operation 17.92% 17.92%
Direct [Member] | MRS Logistica S.A. [Member] | Joint Venture [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Number of shares held by CSN (in units) [1] 63,377,198  
Core business [1] Railroad transportation  
Companies, joint venture [1] MRS Logística S.A.  
Equity interest (%), joint venture [1] 18.64% 18.64%
Direct [Member] | Aceros Del Orinoco S.A. [Member] | Joint Venture [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Core business Dormant company  
Companies, joint venture Aceros Del Orinoco S.A.  
Equity interest (%), joint venture 31.82% 31.82%
Direct [Member] | CBSI - Companhia Brasileira De Servicos De Lnfraestrutura [Member] | Joint Venture [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Core business Provision of services  
Companies, joint venture CBSI - Companhia Brasileira de Serviços de Infraestrutura  
Equity interest (%), joint venture   50.00%
Direct [Member] | Transnordestina Logistica S.A [Member] | Joint Venture [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Number of shares held by CSN (in units) [2] 24,670,093  
Core business [2] Railroad logistics  
Companies, joint venture [2] Transnordestina Logística S.A.  
Equity interest (%), joint venture [2] 47.26% 46.30%
Direct [Member] | Arvedi Metalfer do Brasil S.A. [Member] | Associates [member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Number of shares held by CSN (in units) 46,994,971  
Core business Metallurgical and Equity interests  
Companies, associate Arvedi Metalfer do Brasil S.A.  
Equity interest (%), associate 20.00% 20.00%
Indirect [Member] | MRS Logistica S.A. [Member] | Joint Venture [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Core business Railroad transportation  
Companies, joint venture MRS Logística S.A.  
Equity interest (%), joint venture 16.30% 16.30%
Subsidiaries [member] | Direct [Member] | CSN Islands VII Corp. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Islands VII Corp.  
Number of shares held by CSN (in units) 20,001,000  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions  
Subsidiaries [member] | Direct [Member] | CSN Islands XI Corp. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Islands XI Corp.  
Number of shares held by CSN (in units) 50,000  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions  
Subsidiaries [member] | Direct [Member] | CSN Islands XII Corp. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Islands XII Corp.  
Number of shares held by CSN (in units) 1,540  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions  
Subsidiaries [member] | Direct [Member] | CSN Steel S.L.U. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Steel S.L.U.  
Number of shares held by CSN (in units) 22,042,688  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Equity interests and Financial transactions  
Subsidiaries [member] | Direct [Member] | TdBB S.A [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary [3] TdBB S.A  
Equity interests (%), subsidiary [3] 100.00% 100.00%
Core business [3] Equity interests  
Subsidiaries [member] | Direct [Member] | Sepetiba Tecon S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Sepetiba Tecon S.A.  
Number of shares held by CSN (in units) 254,015,052  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Port services  
Subsidiaries [member] | Direct [Member] | Minerios Nacional S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Minérios Nacional S.A.  
Number of shares held by CSN (in units) 141,719,295  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Mining and Equity interests  
Subsidiaries [member] | Direct [Member] | Companhia Florestal Do Brasil [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Companhia Florestal do Brasil  
Number of shares held by CSN (in units) 42,551,519  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Reforestation  
Subsidiaries [member] | Direct [Member] | Estanho De Rondonia S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Estanho de Rondônia S.A.  
Number of shares held by CSN (in units) 195,454,162  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Tin Mining  
Subsidiaries [member] | Direct [Member] | Companhia Metalurgica Prada [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Companhia Metalúrgica Prada  
Number of shares held by CSN (in units) 445,921,292  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Manufacture of packages and distribution of steel products  
Subsidiaries [member] | Direct [Member] | CSN Gestao De Recursos Financeiros Ltda [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary [3],[4] CSN Gestão de Recursos Financeiros Ltda.  
Equity interests (%), subsidiary [3],[4]   99.99%
Core business [3],[4] Management of funds and securities portfolio  
Subsidiaries [member] | Direct [Member] | CSN Mineracao S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Mineração S.A.  
Number of shares held by CSN (in units) 158,419,480  
Equity interests (%), subsidiary 87.52% 87.52%
Core business Mining and Equity interests  
Subsidiaries [member] | Direct [Member] | CSN Energia S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Energia S.A.  
Number of shares held by CSN (in units) 43,149  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Sale of electric power  
Subsidiaries [member] | Direct [Member] | FTL - Ferrovia Transnordestina Logistica S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary FTL - Ferrovia Transnordestina Logística S.A.  
Number of shares held by CSN (in units) 486,592,830  
Equity interests (%), subsidiary 92.38% 91.69%
Core business Railroad logistics  
Subsidiaries [member] | Direct [Member] | Nordeste Logistica S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Nordeste Logística S.A.  
Number of shares held by CSN (in units) 99,999  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Port services  
Subsidiaries [member] | Direct [Member] | Aceros Mexico CSN [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary [5] Aceros México CSN  
Equity interests (%), subsidiary [5]   0.08%
Core business [5] Commercial representation, steel sales and related activities  
Subsidiaries [member] | Direct [Member] | CSN Inova Ltd. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Inova Ltd.  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Advisory and implementation of new development projects  
Subsidiaries [member] | Direct [Member] | CSN Equipamentos S.A [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary [6] CSN Equipamentos S.A  
Number of shares held by CSN (in units) [6] 999  
Equity interests (%), subsidiary [6] 99.99%  
Core business [6] Rental of commercial and industrial machinery and equipment  
Subsidiaries [member] | Direct [Member] | CBSI - Companhia Brasileira De Servicos De Infraestrutura [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary [7] CBSI - Companhia Brasileira de Serviços de Infraestrutura  
Number of shares held by CSN (in units) [7] 3,752,292  
Equity interests (%), subsidiary [7] 100.00%  
Core business [7] Provision of services  
Subsidiaries [member] | Indirect [Member] | Aceros Mexico CSN [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary [5] Aceros México CSN  
Equity interests (%), subsidiary [5]   99.92%
Core business [5] Commercial representation, steel sales and related activities  
Subsidiaries [member] | Indirect [Member] | Lusosider Projectos Siderurgicos S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Lusosider Projectos Siderúrgicos S.A.  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Equity interests and product sales  
Subsidiaries [member] | Indirect [Member] | Lusosider Acos Planos, S. A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Lusosider Aços Planos, S. A.  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Steel and Equity interests  
Subsidiaries [member] | Indirect [Member] | CSN Resources S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Resources S.A.  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions and Equity interests  
Subsidiaries [member] | Indirect [Member] | Companhia Brasileira De Latas [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Companhia Brasileira de Latas  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Sale of cans and packages in general and Equity interests  
Subsidiaries [member] | Indirect [Member] | Companhia De Embalagens Metalicas MMSA [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Companhia de Embalagens Metálicas MMSA  
Equity interests (%), subsidiary 99.67% 99.67%
Core business Production and sale of cans and related activities  
Subsidiaries [member] | Indirect [Member] | Companhia De Embalagens Metalicas - MTM [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Companhia de Embalagens Metálicas - MTM  
Equity interests (%), subsidiary 99.67% 99.67%
Core business Production and sale of cans and related activities  
Subsidiaries [member] | Indirect [Member] | CSN Steel Holdings 1, S.L.U. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Steel Holdings 1, S.L.U.  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
Subsidiaries [member] | Indirect [Member] | CSN Productos Siderurgicos S.L. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Productos Siderúrgicos S.L.  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
Subsidiaries [member] | Indirect [Member] | Stalhwerk Thuringen GmbH [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Stalhwerk Thüringen GmbH  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Production and sale of long steel and related activities  
Subsidiaries [member] | Indirect [Member] | CSN Steel Sections UK Limited [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary [3] CSN Steel Sections UK Limited  
Equity interests (%), subsidiary [3] 100.00% 100.00%
Core business [3] Sale of long steel  
Subsidiaries [member] | Indirect [Member] | CSN Steel Sections Polska Sp.Z.o.o [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Steel Sections Polska Sp.Z.o.o  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
Subsidiaries [member] | Indirect [Member] | CSN Asia Limited [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary [8] CSN Asia limited  
Equity interests (%), subsidiary [8]   100.00%
Core business [8] Commercial representation  
Subsidiaries [member] | Indirect [Member] | CSN Mining Holding, S.L [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Mining Holding, S.L  
Equity interests (%), subsidiary 87.52% 87.52%
Core business Financial transactions, product sales and Equity interests  
Subsidiaries [member] | Indirect [Member] | CSN Mining GmbH [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Mining GmbH  
Equity interests (%), subsidiary 87.52% 87.52%
Core business Financial transactions, product sales and Equity interests  
Subsidiaries [member] | Indirect [Member] | CSN Mining Asia Limited [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Mining Asia Limited  
Equity interests (%), subsidiary 87.52% 87.52%
Core business Commercial representation  
Subsidiaries [member] | Indirect [Member] | Lusosider Lberica S.A. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Lusosider Ibérica S.A.  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Steel, commercial and industrial activities and equity interests  
Subsidiaries [member] | Indirect [Member] | CSN Mining Portugal, Unipessoal Lda. [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary CSN Mining Portugal, Unipessoal Lda.  
Equity interests (%), subsidiary 87.52% 87.52%
Core business Commercial and representation of products  
Subsidiaries [member] | Indirect [Member] | Companhia Siderurgica Nacional, LLC [Member]    
SummaryOfSignificantAccountingPoliciesLineItems [Line Items]    
Companies, subsidiary Companhia Siderúrgica Nacional, LLC  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Import and distribution/resale of products  
[1] On December 31, 2019 and 2018, the Company directly owned 26,611,282 common shares, 2,673,312 preferred shares class A and 34,092,604 preferred shares class B, totaling 36,765,916 preferred shares of MRS Logistica S.A.
[2] On May 10, 2019, 501,789 shares of shareholder FINOR, all class B preferred shares, were transferred to shareholder CSN. On December 31,2019, the Company had 24,168,304 ordinary shares, 501,789 preferred shares Class B (as of December 31,2018 had 24,168,304 ordinary shares and no preferred shares).
[3] They are dormant Companies therefore they do not appear in the note 8.a, where is disclosed business information under the equity method and fair value through profit or loss and comprehensive income.
[4] CSN Gestao de Recursos Financeiros was liquidated on June 13, 2019
[5] On February 1, 2019, the Federal Taxpayers' Registry was canceled and, therefore, the settlement process of Aceros Mexico CSN was terminated, however, before third parties and for the purposes of commercial law, the settlement was retroactive to September 18, 2018
[6] Company incorporated on August 22, 2019.
[7] On November 29, 2019, a purchase and sale agreement for share was signed, whereby Companhia Siderurgica Nacional acquired the entire participation that CKTR Brasil Servicos Ltda held in CBSI - Companhia Brasileira de Servicos de Infraestrutura. As a result, as of the date mentioned, CSN now holds 100% of CBSI's share capital.
[8] On August 6, 2019 CSN Asia Limited was liquidated