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18. INCOME TAX AND SOCIAL CONTRIBUTION (Details 3) R$ in Thousands	Dec. 31, 2020 BRL (R$)
IncomeTaxAndSocialContributionLineItems [Line Items]
Deferred Asset	R$ 4,703
Deferred liabilities - Parent Company	(828)
Net Deferred Asset	3,875
Deferred liabilities - Subsidiaries	619
Net Deferred Asset	3,256
3/2/2021 [member]
IncomeTaxAndSocialContributionLineItems [Line Items]
Deferred Asset	1,018
2022[member]
IncomeTaxAndSocialContributionLineItems [Line Items]
Deferred Asset	1,315
2023[member]
IncomeTaxAndSocialContributionLineItems [Line Items]
Deferred Asset	1,257
2024[member]
IncomeTaxAndSocialContributionLineItems [Line Items]
Deferred Asset	495
2025[member]
IncomeTaxAndSocialContributionLineItems [Line Items]
Deferred Asset	R$ 618

X

- Definition

The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph g
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard
-URIDate 2020-01-01

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of deferred liabilities parent company.

+ References

No definition available.

+ Details

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Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of deferred liabilities subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of deferred tax assets two.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of gross deferred tax assets.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- References

No definition available.

+ Details

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X

- Details

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- Details

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- Details

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- Details

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