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10. BASIS OF CONSOLIDATION AND INVESTMENTS IN SUBSIDIARIES AND AFFILIATES (Details) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 1,387,524,047 1,387,524,047
Diplic II- Fundo de investimento multimercado credito privado [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interest (%), exclusive funds 100.00% 100.00%
Core business Investment fund  
Caixa Vertice - Fundo de investimento multimercado credito privado [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interest (%), exclusive funds 100.00% 100.00%
Core business Investment fund  
VR1 - Fundo de investimento multimercado credito privado [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interest (%), exclusive funds 100.00% 100.00%
Core business Investment fund  
Arvedi Metalfer do Brasil S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 49,074,882  
Equity interest (%), associate 20.00% 20.00%
Core business Metallurgy and Equity interests  
Ita Energetica S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 253,606,846  
Equity interests (%), operation 48.75% 48.75%
Core business Electric power generation  
CONSORCIO DA USINA HIDRELETRICA DE IGARAPAVA [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), operation 17.92% 17.92%
Core business Electric power consortium  
MRS Logistica S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) [1] 63,377,198  
Equity interest (%), joint venture [1] 18.64% 18.64%
Core business [1] Railroad transportation  
Aceros Del Orinoco S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interest (%), joint venture 31.82% 31.82%
Core business Dormant company  
Transnordestina logistica s.a [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) [2] 24,670,093  
Equity interest (%), joint venture [2] 47.26% 47.26%
Core business [2] Railroad logistics  
Equimac S.A [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) [3] 1,117  
Equity interest (%), joint venture [3] 50.00%  
Core business [3] Rental of commercial and industrial machinery and equipment  
MRS Logistica S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interest (%), joint venture [1] 16.30% 16.30%
Core business [1] Railroad transportation  
CSN Islands VII Corp. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 20,001,000  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions  
CSN inova ventures [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) [4] 50,000  
Equity interests (%), subsidiary [4] 100.00% 100.00%
Core business [4] Financial transactions  
CSN Islands XII Corp. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 1,540  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions  
CSN Steel S.L.U. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
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  
TdBB S.A [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) [5]  
Equity interests (%), subsidiary [5] 100.00% 100.00%
Core business [5] Equity interests  
Sepetiba Tecon S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 254,015,052  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Port services  
Minerios nacional s.a. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 141,719,295  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Mining and Equity interests  
Companhia Florestal do Brasil [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 66,354,391  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Reforestation  
Estanho de Rondonia S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 195,454,162  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Tin Mining  
Companhia Metalurgica Prada [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 555,142,354  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Manufacture of containers and distribution of steel products  
CSN Mineracao SA [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 158,419,480  
Equity interests (%), subsidiary 87.52% 87.52%
Core business Mining  
CSN Energia S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 43,149  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Sale of electric power  
FTL - FERROVIA TRANSNORDESTINA LOGISTICA SA ("FTL") [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 486,592,830  
Equity interests (%), subsidiary 92.38% 92.38%
Core business Railroad logistics  
Nordeste Logistica S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 99,999  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Port services  
CSN Inova Ltd. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units)  
Equity interests (%), subsidiary 100.00% 100.00%
Core business Advisory and implementation of new development projec  
CSN Equipamentos S.A [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) [3]  
Equity interests (%), subsidiary [3]   99.99%
Core business [3] Rental of commercial and industrial machinery and equipment  
CBSI - Companhia Brasileira de Servicos de Infraestrutura [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) 4,669,986  
Equity interests (%), subsidiary 99.99% 99.99%
Core business Equity interests and product sales and iron ore  
CSN Cimentos S.A [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) [6] 90  
Equity interests (%), subsidiary [6] 90.00%  
Core business [6] Manufacturing and sale of cement  
Lusosider Projectos Siderurgicos S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 100.00% 100.00%
Core business Equity interests and product sales  
Lusosider Acos Planos, S. A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 99.99% 99.99%
Core business Steel and Equity interests  
CSN Resources S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions and Equity interests  
Companhia Brasileira de Latas [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 99.99% 99.99%
Core business Sale of cans and containers in general and Equity interests  
Companhia de Embalagens Metalicas MMSA [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 99.67% 99.67%
Core business Production and sale of cans and related activities  
Companhia de Embalagens Metalicas - MTM [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 99.67% 99.67%
Core business Production and sale of cans and related activities  
CSN Steel Holdings 1, S.L.U. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
CSN Productos Siderurgicos S.L. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
Stalhwerk Thuringen GmbH [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 100.00% 100.00%
Core business Production and sale of long steel and related activities  
CSN Steel Sections UK Limited [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary [7]   100.00%
Core business [7] Sale of long steel  
CSN Steel Sections Polska Sp.Z.o.o [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 100.00% 100.00%
Core business Financial transactions, product sales and Equity interests  
CSN Mining Holding, S.L [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 87.52% 87.52%
Core business Financial transactions, product sales and Equity interests  
CSN Mining GmbH [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 87.52% 87.52%
Core business Financial transactions, product sales and Equity interests  
CSN Mining Asia Limited [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 87.52% 87.52%
Core business Commercial representation  
Lusosider Iberica S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 100.00% 100.00%
Core business Steel, commercial and industrial activities and equity interests  
CSN Mining Portugal, Unipessoal Lda. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 87.52% 87.52%
Core business Commercial and representation of products  
Companhia Siderurgica Nacional, LLC [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Equity interests (%), subsidiary 100.00% 100.00%
Core business Import and distribution/resale of products  
CSN Cimentos S.A. [member]    
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items]    
Number of shares held by CSN (in units) [6] 10  
Equity interests (%), subsidiary [6] 10.00%  
Core business [6] Manufacturing and sale of cement  
[1] As of December 31, 2020, the Company directly held 63,377,198 shares, of which 26,611,282 were common and 36,765,916 were preferred, and indirectly 63,338,872 shares, of which 25,802,872 were common and 37,536,000 were preferred
[2] As of December 31, 2020, the Company had 24,168,304 common shares and 501,789 Class B preferred shares.
[3] On June 26, 2020, CSN Equipamentos SA had its corporate name changed to Equimac SA and its capital increased by Unidas Guindastes Eireli. With this capital increase, CSN's stake in Equimac's share capital increased to 50% and was classified as joint venture.
[4] On June 29, 2020, CSN Islands XI Corp. changed its corporate name to CSN Inova Ventures.
[5] Dormant companies.
[6] Company acquired on October 2, 2020.
[7] Company liquidated on March 11, 2020.