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BASIS OF CONSOLIDATION AND INVESTMENTS (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
C S N Islands V I I Corp [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Financial transactions  
C S N Inova Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Equity interests and Financial transactions  
C S N Islands X I I Corp [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Financial transactions  
C S N Steel S L U [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Equity interests and Financial transactions  
Td B B S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary [1] 100.00% 100.00%
Description of nature of entity's operations and principal activities [1] Equity interests  
Sepetiba Tecon S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Port services  
Minerios Nacional S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Mining and Equity interests  
Companhia Florestaldo Brasil [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Reforestation  
Estanho De Rondonia S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Tin Mining  
Companhia Metalurgica Prada [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.90% 99.99%
Description of nature of entity's operations and principal activities Manufacture of containers and distribution of steel products  
C S N Mineracao S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 79.75% 78.24%
Description of nature of entity's operations and principal activities Mining  
C S N Energia S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Sale of electric power  
F T L Ferrovia Transnordestina Logistica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 92.71% 92.71%
Description of nature of entity's operations and principal activities Railroad logistics  
Nordeste Logistica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Port services  
C S N Inova Ltd [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Advisory and implementation of new development projec  
C B S I Companhia Brasileira De Servicos De Infraestrutura [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Equity interests and product sales and iron ore  
C S N Cimentos S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Manufacturing and sale of cement  
Berkeley Participacoes E Empreendimentos S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Electric power generation and equity interests  
C S N Inova Solucoes S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Equity interests  
C S N Participacoes I [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Equity interests  
Circula Mais Servicos De Intermediacao Comercial S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 0.01% 99.99%
Description of nature of entity's operations and principal activities Commercial intermediation for the purchase and sale of assets and materials in general  
C S N Participacoes I I I [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Equity interests  
C S N Participacoes I V [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Equity interests  
C S N Participacoes V [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Equity interests  
Lusosider Projectos Siderurgicos S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Equity interests and product sales  
Lusosider Acos Planos S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Steel and Equity interests  
C S N Resources S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Financial transactions and Equity interests  
Companhia Brasileira De Latas [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Sale of cans and containers in general and Equity interests  
Companhia De Embalagens Metalicas M M S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Production and sale of cans and related activities  
Companhia De Embalagens Metalicas M T M [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99% 99.99%
Description of nature of entity's operations and principal activities Production and sale of cans and related activities  
C S N Steel Holdings 1 S L U [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary [2]   100.00%
Description of nature of entity's operations and principal activities [2] Financial transactions, product sales and Equity interests  
C S N Productos Siderurgicos S L [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Financial transactions, product sales and Equity interests  
Stalhwerk Thuringen Gmb H [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Production and sale of long steel and related activities  
C S N Steel Sections Polska Sp Zoo [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Financial transactions, product sales and Equity interests  
C S N Mining Holding S L U [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 79.75% 78.24%
Description of nature of entity's operations and principal activities Financial transactions, product sales and Equity interests  
C S N Mining Gmb H [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 79.75% 78.24%
Description of nature of entity's operations and principal activities Financial transactions, product sales and Equity interests  
C S N Mining Asia Limited [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 79.75% 78.24%
Description of nature of entity's operations and principal activities Commercial representation  
Lusosider Iberica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Steel, commercial and industrial activities and equity interests  
C S N Mining Portugal Unipessoal Lda [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 79.75% 78.24%
Description of nature of entity's operations and principal activities Commercial and representation of products  
Companhia Siderurgica Nacional L L C [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Import and distribution/resale of products  
Elizabeth Cimentos S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.98% 99.98%
Description of nature of entity's operations and principal activities Manufacturing and sale of cement  
Elizabeth Mineracao Ltda [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary [3]   99.96%
Description of nature of entity's operations and principal activities [3] Mining  
Santa Ana Energetica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Topazio Energetica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Brasil Central Energia Ltda [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Circula Mais Servico De Intermediacao Comercial S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99%  
Description of nature of entity's operations and principal activities Commercial intermediation for the purchase and sale of assets and materials in general  
C S N Cimentos Brasil S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 99.99%  
Description of nature of entity's operations and principal activities Manufacturing and sale of cement  
Metalgrafica Iguacu S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00%  
Description of nature of entity's operations and principal activities Metal packaging manufacturing  
Companhia Energetica Chapeco [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 79.75%  
Description of nature of entity's operations and principal activities Electric power generation  
Companhia Estadual De Geracaode Energia Eletrica C E E E G [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 98.96%  
Description of nature of entity's operations and principal activities Electric power generation  
Ventosde Vera Cruz S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 98.95%  
Description of nature of entity's operations and principal activities Electric power generation  
Ventosde Curupira S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 98.95%  
Description of nature of entity's operations and principal activities Electric power generation  
Ventosde Povo Novo S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 98.95%  
Description of nature of entity's operations and principal activities Electric power generation  
Ita Energetica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 48.75% 48.75%
Description of nature of entity's operations and principal activities Electric power generation  
Consorcio Da Usina Hidreletrica De Igarapava [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 17.92% 17.92%
Description of nature of entity's operations and principal activities Electric power consortium  
M R S Logistica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 18.64% 18.64%
Description of nature of entity's operations and principal activities Railroad transportation  
Aceros Del Orinoco S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary [1] 31.82% 31.82%
Description of nature of entity's operations and principal activities [1] Dormant company  
Transnordestina Logistica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 47.26% 47.26%
Description of nature of entity's operations and principal activities Railroad logistics  
Equimac S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 50.00% 50.00%
Description of nature of entity's operations and principal activities Rental of commercial and industrial machinery and equipment  
M R S Logistica S A 1 [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 14.86% 14.58%
Description of nature of entity's operations and principal activities Railroad transportation  
Arvedi Metalfer Do Brasil S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 20.00% 20.00%
Description of nature of entity's operations and principal activities Metallurgy and Equity interests  
Ventosda Lagoa Energia S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 10.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Jaguari Energetica S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 10.50%  
Description of nature of entity's operations and principal activities Electric power generation  
Chapecoense Geracao S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 9.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Parques Eolicos Palmares S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 10.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Ventosdo Litoral Energia S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 10.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Ventosdos Indios Energia S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 10.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Companhia Energetica Riodas Antas Ceran [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 10.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Ventosdo Sul S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 10.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Foz Chapeco Energia S A [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 10.00%  
Description of nature of entity's operations and principal activities Electric power generation  
Diplic I I Private Credit Balanced Mutual Fund [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Investment fund  
Caixa Vertice Private Credit Balanced Mutual Fund [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Investment fund  
V R 1 Private Credit Balanced Mutual Fund [Member]    
IfrsStatementLineItems [Line Items]    
Proportion of ownership interest in subsidiary 100.00% 100.00%
Description of nature of entity's operations and principal activities Investment fund  
[1] Dormant companies.
[2] - CSN Steel Holdings 1, S.L.U. was incorporated by CSN Productos Siderúrgicos S.L. on August 02, 2022
[3] - Elizabeth Mineração was incorporated by CSN Cimentos S/A on April 30, 2022.