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EMPLOYEE BENEFITS (Details 1) - BRL (R$) R$ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020
--- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |
Liabilities (Assets), net | R$ (39,530) | R$ (35,477) |
Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Present value of defined benefit obligation | 3,329,076 | 3,110,848 | R$ 3,151,609
Fair value of plan assets | (3,713,099) | (3,572,869) | (3,584,244)
Deficit(Surplus) | (384,023) | (462,021) | (432,635)
Restriction to actuarial assets due to recovery limitation | 367,265 | 426,544 | 373,524
Liabilities (Assets), net | R$ (16,758) | R$ (35,477) | R$ (59,111)

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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_SurplusDeficitInPlan
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | sid_AssetsOfBenefitPlans
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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- References No definition available. + Details
Name: | sid_PlanAssetsAtFairValue1
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=ifrs-full_DefinedBenefitPlansOtherThanMultiemployerPlansStatePlansAndPlansThatShareRisksBetweenEntitiesUnderCommonControlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |