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BASIS OF CONSOLIDATION AND INVESTMENTS (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
CSN Islands VII Corp [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Financial transactions   
CSN Inova Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Equity interests and financial transactions  
CSN Islands XII Corp [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Financial transactions   
CSN Steel SLU [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Equity interests and financial transactions  
TdBB SA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Equity interests   
Sepetiba Tecon S. A. [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.99%
Core business  Port services   
Minerios Nacional S.A. [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.99%
Core business  Mining and Equity interests   
Companhia Florestaldo Brasil [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.99%
Core business Reforestation  
Estanho De Rondonia S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.99%
Core business  Tin Mining  
Companhia Metalurgica Prada [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.89% 99.89%
Core business  Manufacture of containers and distribution of steel products   
CSN Mineracao SA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 69.01% 79.75%
Core business Mining  
CSN Energia SA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.99%
Core business  Sale of electric power   
FTL Ferrovia Transnordestina Logistica SA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 92.71% 92.71%
Core business  Railroad logistics   
Nordeste Logistica S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.99%
Core business  Port services   
CSN Inova Ltd [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Advisory and implementation of new development projec   
CBSI Companhia Brasileira De Servicos De Infraestrutura [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.99%
Core business  Services render   
CSN Cimentos Brasil SA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.99%
Core business  Manufacturing and sale of cement  
Berkeley Participacoes E Empreendimentos S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Electric power generation and equity interests   
CSN Inova Solucoes SA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.90%
Core business  Equity interests   
CSN ParticipacoesI [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.90% 99.90%
Core business  Equity interests   
Circula Mais Servicos De Intermediacao Comercial S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 0.10% 0.10%
Core business  Commercial intermediation for the purchase and sale of assets and materials in general   
CSN Participacoes III [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.90% 99.90%
Core business  Equity interests   
CSN Participacoes IV [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.90% 99.90%
Core business  Equity interests   
CSN Participacoes V [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.90% 99.90%
Core business  Equity interests   
CSN Incorporacao E Participacoes Ltda [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99%  
Core business  Equity interests   
Lusosider Projectos Siderurgicos S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Equity interests and product sales   
Lusosider Acos Planos S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 99.99%
Core business  Steel and Equity interests   
CSN Resources SA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Financial transactions and Equity interests   
Companhia Brasileira De Latas [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.89% 99.88%
Core business  Sale of cans and packages in general and Equity interests   
Companhia De Embalagens Metalicas MMSA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.88% 99.87%
Core business  Production and sale of cans and related activities   
Companhia De Embalagens Metalicas MTM [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.88% 99.87%
Core business  Production and sale of cans and related activities   
CSN Productos Siderurgicos SL [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Financial transactions, product sales and Equity interests   
Stalhwerk Thuringen Gmb H [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Production and sale of long steel and related activities   
CSN Steel Sections Polska Sp Zoo [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Financial transactions, product sales and Equity interests   
CSN Mining Holding SLU [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 69.01% 79.75%
Core business  Financial transactions, product sales and Equity interests   
CSN Mining GmbH [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 69.01% 79.75%
Core business  Financial transactions, product sales and Equity interests   
CSN Mining Asia Limited [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 69.01% 79.75%
Core business  Commercial representation   
Lusosider Iberica S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Steel, commercial and industrial activities and equity interests   
CSN Mining Portugal Unipessoal Lda [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests   79.75%
Core business  Commercial and representation of products   
Companhia Siderurgica Nacional LLC [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Import and distribution/resale of products   
Elizabeth Cimentos S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.98%
Core business  Manufacturing and sale of cement  
Santa Ana Energetica S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.98%
Core business  Electric power generation   
Topazio Energetica S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.98%
Core business  Electric power generation   
Brasil Central Energia Ltda [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.98%
Core business  Electric power generation   
Circula Mais Servico De Intermediacao Comercial S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 99.90%
Core business  Commercial intermediation for the purchase and sale of assets and materials in general   
Metalgrafica Iguacu S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.89% 99.89%
Core business  Metal packaging manufacturing   
Companhia Energetica Chapeco [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 69.01% 79.75%
Core business  Electric power generation   
Companhia Estadua lDe Geracaode Energia Eletrica CEEEG [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 98.98%
Core business  Electric power generation   
Ventosde Vera Cruz S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 98.97%
Core business  Electric power generation   
Ventosde Curupira S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 98.97%
Core business  Electric power generation   
Ventosde Povo Novo S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 99.99% 98.97%
Core business  Electric power generation   
MAZET Maschinenbau Zerspanungstechnik Unterwellwnborn GmbH [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business  Production and sale of long steel and related activities   
CSN Mining Internacional GmbH [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 69.01% 79.75%
Core business  Commercial and representation of products   
CSN International Steel GmbH [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00%  
Core business  Commercial and representation of products   
Ita Energetica S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 48.75% 48.75%
Core business Electric power generation  
MRS Logistica SA [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 18.75% 18.64%
Core business Railroad transportation  
Aceros Del Orinoco S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 31.82% 31.82%
Core business Dormant company  
Transnordestina Logistica S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 48.03% 48.03%
Core business Railroad logistics  
Equimac S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 50.00% 50.00%
Core business Rental of commercial and industrial machinery and equipment  
MRS Logistica SA 1 [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 12.93% 14.86%
Core business Railroad transportation  
Arvedi Metalfer Do Brasil S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 20.00% 20.00%
Core business Metallurgy and Equity interests  
Panatlantica S. A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 29.92%  
Core business Steel  
Jaguari Energetica S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 10.50% 10.39%
Core business Electric power generation  
Chapecoense Geracao S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 9.00% 8.91%
Core business Electric power generation  
Companhia Energetica Riodas Antas Ceran [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 30.00% 29.69%
Core business Electric power generation  
Ventosdo Sul Energia S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests   9.90%
Core business Electric power generation  
Foz Chapeco Energia S A [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 9.00% 8.91%
Core business Electric power generation  
Diplic I I Private Credit Balanced Mutual Fund [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business Investment fund  
Caixa Vertice Private Credit Balanced Mutual Fund [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business Investment fund  
VR1 Private Credit Balanced Mutual Fund [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business Investment fund  
Consorcio Itauba [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business Electric power generation  
Consorcio Passo Real [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 100.00% 100.00%
Core business Electric power generation  
Consorcio Da Usina Hidreletrica De Igarapava [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 17.92% 17.92%
Core business Electric power generation  
Consorcio Dona Francisca [Member]    
IfrsStatementLineItems [Line Items]    
Equity interests 15.00% 15.00%
Core business Electric power generation