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SEGMENT INFORMATION (Details Narrative) | Dec. 31, 2023
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Minerios Nacional [Member] |
IfrsStatementLineItems [Line Items] |
Percentage of interest | 100.00%

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- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2023-01-01 -Paragraph B64 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B64_c&doctype=Appendix&subtype=B -URIDate 2023-03-23 + Details
Name: | ifrs-full_PercentageOfVotingEquityInterestsAcquired
Namespace Prefix: | ifrs-full_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=sid_MineriosNacionalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |