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26. EXPENSES BY NATURE (Details Narrative) - Iron ore [member] R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 BRL (R$)
ExpenseByNatureLineItems [Line Items] |
Percentage of production process | 100.00%
Book balance of assets | R$ 515,491
Lease agreements [member] |
ExpenseByNatureLineItems [Line Items] |
Cost of production | R$ 5,335

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- Definition Represent information about the book balance of assets. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of cost of production. + References No definition available. + Details
Name: | sid_CostOfProduction
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Represent information about the percentage of production process. + References No definition available. + Details
Name: | sid_PercentageOfProductionProcess
Namespace Prefix: | sid_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ProductsAndServicesAxis=sid_IronOreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfContractsAxis=sid_LeaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |