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30. EMPLOYEE BENEFITS (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assets | R$ (13,819) | R$ (13,714) |
Actuarial liabilities | 758,426 | 912,184 |
Benefits of Pension Plans [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assets | 13,819 | 13,714 | R$ 99,894
Actuarial liabilities | 79,546 | 19,788 | 7,982
Post-employment Healthcare Benefits [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial liabilities | R$ 678,880 | R$ 892,396 | R$ 897,137

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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 2020-01-01 -Paragraph 35 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=26&code=ifrs-tx-2020-en-r&anchor=para_35_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
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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: |
Data Type: | na
Balance Type: |
Period Type: |