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26 EMPLOYEE BENEFITS (Details 11) - Benefits of Pension Plans [Member] R$ in Thousands | Dec. 31, 2019 BRL (R$)
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EmployeeBenefitsLineItems [Line Items] |
Year 1 | R$ 267,764
Year 2 | 261,355
Year 3 | 255,518
Year 4 | 249,398
Year 5 | 243,000
Next 5 years | 1,109,647
Total forecast payments | R$ 2,386,682

X
- Definition Amount of benefits for defined benefit plan Forecast to be paid. + References No definition available. + Details
Name: | sid_DefinedBenefitPlanForecastFutureBenefitPayments
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits for defined benefit plan Forecast to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References No definition available. + Details
Name: | sid_DefinedBenefitPlanForecastFutureBenefitPaymentsFiveFiscalYearsThereafter
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits for defined benefit plan Forecast to be paid in next fiscal year following latest fiscal year. + References No definition available. + Details
Name: | sid_DefinedBenefitPlanForecastFutureBenefitPaymentsNextTwelveMonths
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits for defined benefit plan Forecast to be paid in fifth fiscal year following latest fiscal year. + References No definition available. + Details
Name: | sid_DefinedBenefitPlanForecastFutureBenefitPaymentsYearFive
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits for defined benefit plan Forecast to be paid in fourth fiscal year following latest fiscal year. + References No definition available. + Details
Name: | sid_DefinedBenefitPlanForecastFutureBenefitPaymentsYearFour
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits for defined benefit plan Forecast to be paid in third fiscal year following latest fiscal year. + References No definition available. + Details
Name: | sid_DefinedBenefitPlanForecastFutureBenefitPaymentsYearThree
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits for defined benefit plan Forecast to be paid in second fiscal year following latest fiscal year. + References No definition available. + Details
Name: | sid_DefinedBenefitPlanForecastFutureBenefitPaymentsYearTwo
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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