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17 PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS (Details Narrative) - BRL (R$) R$ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Mining [Member]
ProvisionForEnvironmentalLiabilitiesAndAssetRetirementObligationsLineItems [Line Items]
Provision for deactivating assets	R$ 331,731	R$ 83,380

X

- Definition

The amount of liabilities of uncertain timing or amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph l
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_l&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_Provisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	sid_ProvisionForEnvironmentalLiabilitiesAndAssetRetirementObligationsLineItems
Namespace Prefix:	sid_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=sid_MiningMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: