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INSURANCE (Details Narrative) R$ in Millions	12 Months Ended
	Dec. 31, 2021 BRL (R$)
Indemnity limit	R$ 475
Deductible material damages	R$ 385

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- References

No definition available.

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Name:	sid_DeductibleMaterialDamages
Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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Name:	sid_IndemnityLimit
Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration