XML 296 R88.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of consolidated entities information (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 1,387,524,047 | 1,387,524,047
C S N Islands V I I Corp [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 20,001,000 |
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] |  |
Number of shares held by CSN (in units) | 50,000 |
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] |  |
Number of shares held by CSN (in units) | 1,540 |
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] |  |
Number of shares held by CSN (in units) | 22,042,688 |
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 | 100.00% | 100.00%
Description of nature of entity's operations and principal activities | Equity interests |
Sepetiba Tecon S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 254,015,052 |
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] |  |
Number of shares held by CSN (in units) | 141,719,295 |
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] |  |
Number of shares held by CSN (in units) | 71,171,281 |
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] |  |
Number of shares held by CSN (in units) | 195,454,162 |
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] |  |
Number of shares held by CSN (in units) | 555,142,354 |
Proportion of ownership interest in subsidiary | 99.99% | 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] |  |
Number of shares held by CSN (in units) | 4,374,779,493 |
Proportion of ownership interest in subsidiary | 78.24% | 87.52%
Description of nature of entity's operations and principal activities | Mining |
C S N Energia S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 43,149 |
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] |  |
Number of shares held by CSN (in units) | 510,726,198 |
Proportion of ownership interest in subsidiary | 92.71% | 92.38%
Description of nature of entity's operations and principal activities | Railroad logistics |
Nordeste Logistica S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 99,999 |
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] |  |
Number of shares held by CSN (in units) | 10,000 |
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 project |
C B S I Companhia Brasileira De Servicos De Infraestrutura [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 4,669,986 |
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] |  |
Number of shares held by CSN (in units) | 385,666,665 |
Proportion of ownership interest in subsidiary | 99.99% | 90.00%
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] |  |
Number of shares held by CSN (in units) | 1,000 |
Proportion of ownership interest in subsidiary | 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] |  |
Number of shares held by CSN (in units) | 999 |
Proportion of ownership interest in subsidiary | 99.99% |
Description of nature of entity's operations and principal activities | Equity interests |
C S N Participacoes I [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 999 |
Proportion of ownership interest in subsidiary | 99.99% |
Description of nature of entity's operations and principal activities | Equity interests |
C S N Participacoes I I [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 999 |
Proportion of ownership interest in subsidiary | 99.99% |
Description of nature of entity's operations and principal activities | Equity interests |
C S N Participacoes I I I [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 999 |
Proportion of ownership interest in subsidiary | 99.99% |
Description of nature of entity's operations and principal activities | Equity interests |
C S N Participacoes I V [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 999 |
Proportion of ownership interest in subsidiary | 99.99% |
Description of nature of entity's operations and principal activities | Equity interests |
C S N Participacoes V [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 999 |
Proportion of ownership interest in subsidiary | 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 | 100.00% | 100.00%
Description of nature of entity's operations and principal activities | 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 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Proportion of ownership interest in subsidiary | 78.24% | 87.52%
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 | 78.24% | 87.52%
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 | 78.24% | 87.52%
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 Mining Portugal Unipessoal Lda [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Proportion of ownership interest in subsidiary | 78.24% | 87.52%
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 |
C S N Cimentos S A 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Proportion of ownership interest in subsidiary |  | 10.00%
Description of nature of entity's operations and principal activities | Manufacturing and sale of cement |
Elizabeth Cimentos S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Proportion of ownership interest in subsidiary | 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 | 99.96% |
Description of nature of entity's operations and principal activities | Mining |
Ita Energetica S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 253,606,846 |
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] |  |
Number of shares held by CSN (in units) | 63,377,198 |
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 | 31.82% | 31.82%
Description of nature of entity's operations and principal activities | Dormant company |
Transnordestina Logistica S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 24,670,093 |
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] |  |
Number of shares held by CSN (in units) | 1,395 |
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 | 14.58% | 16.30%
Description of nature of entity's operations and principal activities | Railroad transportation |
Arvedi Metalfer Do Brasil S A [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Number of shares held by CSN (in units) | 57,224,882 |
Proportion of ownership interest in subsidiary | 20.00% | 20.00%
Description of nature of entity's operations and principal activities | Metallurgy and Equity interests |
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 | nvestment 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 | nvestment fund |

X
- Definition The description of the nature of the entity's operations and principal activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 138 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_138_b&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_NumberOfSharesOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2021-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_IfrsStatementLineItems
Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNIslandsVIICorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNInovaVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNIslandsXIICorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNSteelSLUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_TdBBSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_SepetibaTeconSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_MineriosNacionalSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CompanhiaFlorestaldoBrasilMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_EstanhoDeRondoniaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CompanhiaMetalurgicaPradaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNMineracaoSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNEnergiaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_FTLFerroviaTransnordestinaLogisticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_NordesteLogisticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNInovaLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CBSICompanhiaBrasileiraDeServicosDeInfraestruturaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNCimentosSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_BerkeleyParticipacoesEEmpreendimentosSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNInovaSolucoesSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNParticipacoesIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNParticipacoesIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNParticipacoesIIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNParticipacoesIVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNParticipacoesVMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_LusosiderProjectosSiderurgicosSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_LusosiderAcosPlanosSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNResourcesSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CompanhiaBrasileiraDeLatasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CompanhiaDeEmbalagensMetalicasMMSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CompanhiaDeEmbalagensMetalicasMTMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNSteelHoldings1SLUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNProductosSiderurgicosSLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_StalhwerkThuringenGmbHMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNSteelSectionsPolskaSpZooMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNMiningHoldingSLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNMiningGmbHMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNMiningAsiaLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_LusosiderIbericaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSMiningPortugalUnipessoalLdaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CompanhiaSiderurgicaNacionalLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CSNCimentosSA1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_ElizabethCimentosSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_ElizabethMineracaoLtdaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_ItaEnergeticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_ConsorcioDaUsinaHidreletricaDeIgarapavaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_MRSLogisticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_AcerosDelOrinocoSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_TransnordestinaLogisticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_EquimacSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_MRSLogisticaSA1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_ArvediMetalferDoBrasilSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_DiplicIIPrivateCreditBalancedMutualFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_CaixaVerticePrivateCreditBalancedMutualFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_VR1PrivateCreditBalancedMutualFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |