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16. LEASES (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Presentation of leases for lessee [abstract] |  |
Opening balance | R$ 474,390 | R$ 640,989
New leases | 52,835 | 106,584
Present Value Adjustments - New leases | (6,511) | (54,080)
Contract review | 63,250 | (175,609)
Write off | (7,757) | (1,374)
Payments | (103,648) | (94,727)
Interest appropriated | 54,236 | 52,607
Exchange variation | 3,336 |
Net balance | R$ 530,131 | R$ 474,390

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The amoount of Exchange variation. + References No definition available. + Details
Name: | sid_ExchangeVariation
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount refers to the LeaseLiabilitiesContractReview. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesContractReview
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount refers to the LeaseLiabilitiesInterestAppropriated. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesInterestAppropriated
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount refers to the lease liabilities new leases. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesNewLeases
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount refers to the LeaseLiabilitiesPayments. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesPayments
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount refers to the Lease Liabilities Present Value Adjustments New leases. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesPresentValueAdjustmentsNewleases
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount refers to the LeaseLiabilitiesWriteoff. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesWriteoff
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration