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v3.24.1.u1

EMPLOYEE BENEFITS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Actuarial assets | R$ (39,530) | R$ (35,477)
Actuarial liabilities | 503,890 | 537,290
Benefits Of Pension Plans [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assets | (39,530) | (35,477)
Actuarial liabilities | 22,772 |
Post Employment Healthcare Benefits [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial liabilities | R$ 481,118 | R$ 537,290

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

X
- 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_LiabilityOfBenefitPlan
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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