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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.

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