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27. OTHER OPERATING INCOME AND EXPENSES (Details Narrative) - BRL (R$) R$ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Operating Income And Expenses |  |  |  |
Receivables by indemnity | R$ 84,435 | R$ 517,183 |  |
Rent arrears | 58,785 |  |  |
Collection of insurance for material damage | 25,650 |  |  |
Principal amount receivables for indemnity | R$ 147,612 |  |  |
Other operating expenses |  | 1,667,886 | R$ 790,353 |
Cash flow hedge of PLATTS index |  | 283,149 |  |
Cash flow hedge realized |  | R$ (1,951,035) |  |

X
- Definition The amount of cash flow hedge of platts index. + References No definition available. + Details
Name: | sid_CashFlowHedgeOfPlattsIndex
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash flow hedge realised. + References No definition available. + Details
Name: | sid_CashFlowHedgeRealised
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of collection of insurance for material damage. + References No definition available. + Details
Name: | sid_CollectionOfInsuranceForMaterialDamage
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of other operating expenses. + References No definition available. + Details
Name: | sid_OtherOperatingExpenses
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represent other operating income and expense abstract. + References No definition available. + Details
Name: | sid_OtherOperatingInconeAndExpensesAbstarct
Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of principal amount receivables for indemnity. + References No definition available. + Details
Name: | sid_PrincipalAmountReceivablesForIndemnity
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of receivables by indemnity. + References No definition available. + Details
Name: | sid_ReceivablesByIndemnity
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represent information about the rent arrears. + References No definition available. + Details
Name: | sid_RentArrears
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration