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BASIS OF CONSOLIDATION AND INVESTMENTS (Details) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
C S N Islands V I I Corp [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 100.00% | 100.00%
Core business | Financial transactions |
C S N Inova Ventures [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 100.00% | 100.00%
Core business | Equity interests and Financial transactions |
C S N Islands X I I Corp [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 100.00% | 100.00%
Core business | Financial transactions |
C S N Steel S L U [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 100.00% | 100.00%
Core business | Equity interests and Financial transactions |
Td B B S A [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 Florestal do 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 |
C S N Mineracao S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 79.75% | 79.75%
Core business | Mining |
C S N Energia S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.99% | 99.99%
Core business | Sale of electric power |
F T L Ferrovia Transnordestina Logistica S A [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 |
C S N Inova Ltd [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 100.00% | 100.00%
Core business | Advisory and implementation of new development projects |
C B S I Companhia Brasileira De Servicos De Infraestrutura [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.99% | 99.99%
Core business | Equity interests and product sales and iron ore |
C S N Cimentos S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests |  | 99.99%
Core business | Manufacturing and sale of cement |
C S N Cimentos Brasil S A [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 |
C S N Inova Solucoes S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.90% | 99.99%
Core business | Equity interests |
C S N Participacoes I [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.90% | 99.99%
Core business | Equity interests |
Circula Mais Servicos De Intermediacao Comercial S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 0.10% | 0.01%
Core business | Commercial intermediation for the purchase and sale of assets and materials in general |
C S N Participacoes I I I [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.90% | 99.99%
Core business | Equity interests |
C S N Participacoes I V [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.90% | 99.99%
Core business | Equity interests |
C S N Participacoes V [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.90% | 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 | 99.99% | 99.99%
Core business | Steel and Equity interests |
C S N Resources S A [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 | 99.88% | 99.88%
Core business | Sale of cans and containers in general and Equity interests |
Companhia De Embalagens Metalicas M M S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.87% | 99.87%
Core business | Production and sale of cans and related activities |
Companhia De Embalagens Metalicas M T M [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.87% | 99.87%
Core business | Production and sale of cans and related activities |
C S N Productos Siderurgicos S L [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 |
C S N Steel Sections Polska Sp Zoo [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 100.00% | 100.00%
Core business | Financial transactions, product sales and Equity interests |
C S N Mining Holding S L U [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 79.75% | 79.75%
Core business | Financial transactions, product sales and Equity interests |
C S N Mining Gmb H [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 79.75% | 79.75%
Core business | Financial transactions, product sales and Equity interests |
C S N Mining Asia Limited [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 79.75% | 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 |
C S N Mining Portugal Unipessoal Lda [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 79.75% | 79.75%
Core business | Commercial and representation of products |
Companhia Siderurgica Nacional L L C [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 | 99.98% | 99.98%
Core business | Manufacturing and sale of cement |
Santa Ana Energetica S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.98% | 99.99%
Core business | Electric power generation |
Topazio Energetica S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.98% | 99.99%
Core business | Electric power generation |
Brasil Central Energia Ltda [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.98% | 99.99%
Core business | Electric power generation |
Circula Mais Servico De Intermediacao Comercial S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 99.90% | 99.99%
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 | 79.75% | 79.75%
Core business | Electric power generation |
Companhia Estadual De Geracaode Energia Eletrica C E E E G [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 98.98% | 98.96%
Core business | Electric power generation |
Ventosde Vera Cruz S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 98.97% | 98.95%
Core business | Electric power generation |
Ventosde Curupira S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 98.97% | 98.95%
Core business | Electric power generation |
Ventosde Povo Novo S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 98.97% | 98.95%
Core business | Electric power generation |
M A Z E T Maschinenbau Zerspanungstechnik Gmb H [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 100.00% |
Core business | Production and sale of long steel and related activities |
C S N Mining Internacional Gmb H [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 |
Consorcio Da Usina Hidreletrica De Igarapava [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 17.92% | 17.92%
Core business | Electric power consortium |
Consorcio Itauba [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 36.60% | 36.60%
Core business | Electric power generation |
Consorcio Passo Real [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 46.97% |
Core business | Electric power generation |
M R S Logistica S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 18.64% | 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 |
Consorcio Itauba 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 63.40% | 63.40%
Core business | Electric power generation |
Consorcio Passo Real 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 53.03% |
Core business | Electric power generation |
M R S Logistica S A 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 14.86% | 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 |
Ventosda Lagoa Energia S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests |  | 10.00%
Core business | Electric power generation |
Jaguari Energetica S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 10.39% | 10.39%
Core business | Electric power generation |
Chapecoense Geracao S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 8.91% | 8.91%
Core business | Electric power generation |
Parques Eolicos Palmares S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests |  | 10.00%
Core business | Electric power generation |
Ventosdo Litoral Energia S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests |  | 10.00%
Core business | Electric power generation |
Ventosdos Indios Energia S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests |  | 10.00%
Core business | Electric power generation |
Companhia Energetica Riodas Antas Ceran [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 29.69% | 29.69%
Core business | Electric power generation |
Ventosdo Sul Energia S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 9.90% | 10.00%
Core business | Electric power generation |
Foz Chapeco Energia S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 8.91% | 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 |
V R 1 Private Credit Balanced Mutual Fund [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Equity interests | 100.00% | 100.00%
Core business | Investment fund |

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