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26 EMPLOYEE BENEFITS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
EmployeeBenefitsLineItems [Line Items] |  |  |
Actuarial assets | R$ (13,714) | R$ (99,894) |
Actuarial liabilities | 912,184 | 905,119 |
Benefits of Pension Plans [Member] |  |  |
EmployeeBenefitsLineItems [Line Items] |  |  |
Actuarial assets | 13,714 | 99,894 |
Actuarial liabilities | 19,788 | 7,982 |
Post-employment Healthcare Benefits [Member] |  |  |
EmployeeBenefitsLineItems [Line Items] |  |  |
Actuarial liabilities | R$ 892,396 | R$ 897,137 | R$ 866,784

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- Definition The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2019-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2019-en-r&anchor=para_35_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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

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- Definition The amount of liabilites held by retirement benefit plans. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |