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13. BORROWINGS AND FINANCING (Details Narrative) R$ in Thousands | Dec. 31, 2019 BRL (R$)
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Borrowings And Financing |
Accrued commision on risk assumption | R$ 10,531

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- Definition The amount refers to accrued commision on risk assumption. + References No definition available. + Details
Name: | sid_AccruedCommisionOnRiskAssumption
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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