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LEASE LIABILITIES (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Lease Liabilities |  |
Opening balance | R$ 693,846 | R$ 611,551
New leases | 189,855 | 29,633
Present Value Adjustments - New leases | (116,640) | (3,300)
Contract review | 124,310 | 99,419
Write-off |  | (781)
Payments | (239,909) | (155,995)
Interest appropriated | 82,521 | 69,510
Acquisition of companies |  | 45,352
Exchange variation | (222) | (1,543)
Net balance | R$ 733,761 | R$ 693,846

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- References No definition available. + Details
Name: | sid_ExchangeVariations
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sid_LeaseLiabilitiesAcquisitionOfCompanies
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sid_LeaseLiabilitiesContractReview
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sid_LeaseLiabilitiesInterestAppropriated
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sid_LeaseLiabilitiesNewLeases
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | sid_LeaseLiabilitiesPayments
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | sid_LeaseLiabilitiesPresentValueAdjustmentsNewlease
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | sid_LeaseLiabilitiesWriteoff
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration