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: |