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7. OTHER CURRENT AND NON-CURRENT ASSETS (Details Narrative ) R$ in Thousands	12 Months Ended
	Dec. 31, 2019 BRL (R$)
Eletrobras's Compulsory Loan [Member]
Disclosure of financial assets [line items]
Recovery of additional credits	R$ 350,000

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of recovery of additional credits.

+ References

No definition available.

+ Details

Name:	sid_GainOnRecoveryOfCredits
Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=sid_MonetaryAdjustmentRelatedToTheEletrobrassCompulsoryLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: