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33. ADDITIONAL INFORMATION TO CASH FLOWS (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Additional Information To Cash Flows [Abstract] |  |  |
Income tax and social contribution paid | R$ 542,877 | R$ 1,167,419 | R$ 336,962
Addition to PP&E with interest capitalization (notes 11 and 28) | 92,506 | 117,189 | 71,611
Initial adoption IFRS16 - Right of use |  | 640,989 |
Remeasurement and addition - Right of use (note 11 a) | 109,993 | (151,558) |
Addition to PP&E without adding cash | 30,345 | 278,213 | 10,792
Capitalization in subsidiaries without cash | 104,809 |  |
Addition to investment property without cash effect | 61,597 |  |
Net additional cash | R$ 942,127 | R$ 2,052,252 | R$ 419,365

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- Definition Represent information about the addition to investment property without cash effect. + References No definition available. + Details
Name: | sid_AdditionToInvestmentPropertyWithoutCashEffect
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent information about the addition to ppe without adding cash. + References No definition available. + Details
Name: | sid_AdditionToPpeWithoutAddingCash
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The cash outflow from addition to PP&amp;amp;amp;amp;amp;E with interest capitalization. + References No definition available. + Details
Name: | sid_AdditionsFromAcquisitionsInvestmentPropertyWithCapitalisedInterest
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow from a income tax and social contribution paid. + References No definition available. + Details
Name: | sid_AdjustmentsForIncomeTaxAndSocialContributionPaid
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent information about the capitalization in subsidiaries without cash. + References No definition available. + Details
Name: | sid_CapitalizationInSubsidiariesWithoutCash
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow for adoption to right-of-use assets. + References No definition available. + Details
Name: | sid_InitialAdoptionRightOfUse
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount refers to the net additionl cash. + References No definition available. + Details
Name: | sid_NetAdditionalCash
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount refers to remeasurement right of use1. + References No definition available. + Details
Name: | sid_RemeasurementRightOfUse1
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration