XML 171 R152.htm IDEA: XBRL DOCUMENT v3.21.1

21. PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMMENT OBLIGATIONS (Details Narrative) R$ in Thousands	Dec. 31, 2020 BRL (R$)
Mining [member]
ProvisionForEnvironmentalLiabitiesAndAssetRetiremmentObligationsLineItems [Line Items]
Provision for deactivating assets	R$ 279,000

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 2020-01-01
-Paragraph 54
-Subparagraph l
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_l&doctype=Standard
-URIDate 2020-01-01

+ 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_ProvisionForEnvironmentalLiabitiesAndAssetRetiremmentObligationsLineItems
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: