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