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17. TRADE PAYABLES (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Current trade payables [member] |  |
TradePayablesLineItems [Line Items] |  |
Trade payables | R$ 4,893,589 | R$ 3,012,654
(-) Adjustment present value | (74,050) |
Trade payable, net | 4,819,539 | R$ 3,012,654
Non current trade payables [member] |  |
TradePayablesLineItems [Line Items] |  |
Trade payables | 594,051 |
(-) Adjustment present value | (50,524) |
Trade payable, net | R$ 543,527 |

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- Definition The amount of trade payables and other payables. [Refer: Trade payables; Other payables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph k -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_k&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_TradeAndOtherPayables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of payment due to suppliers for goods and services used in the entity's business. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_TradeAndOtherPayablesToTradeSuppliers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represent information about the adjustment present value. + References No definition available. + Details
Name: | sid_AdjustmentPresentValue
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=sid_CurrentTradePayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=sid_NonCurrentTradePayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |