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18. INCOME TAX AND SOCIAL CONTRIBUTION (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
IncomeTaxAndSocialContributionLineItems [Line Items] |  |
Profit generated by foreign subsidiaries | R$ 1,284,483 |
Income tax and social contribution | 412,420 |
Tax losses carryforward | 1,681,000 | R$ 1,466,000
Negative base of social contribution | 627,000 | R$ 550,000
Reversed of estimated losses | 1,369,000 |
Deferred tax asset | R$ 4,628,000 |
Top of range [member] |  |
IncomeTaxAndSocialContributionLineItems [Line Items] |  |
Tax credits maturity terms | 10 years |

X
- Definition The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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Period Type: | instant

X
- Definition The amount of deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount refers to income tax and social contribution. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of negative base of social contribution. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount refers to profit generated by foreign subsidiaries. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of reversed of estimated losses. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represent information about the tax credits maturity terms. + References No definition available. + Details
Name: | sid_TaxCreditsMaturityTerms
Namespace Prefix: | sid_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Period Type: |