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13 OTHER PAYABLES (Details 6) R$ in Thousands | Dec. 31, 2019 BRL (R$)
--- | ---
Other Payables [Abstract] |
Leases | R$ 1,489,789
Present value adjustment - Leases | (1,026,919)
Potencial PIS and COFINS credit | 137,805
Present value adjustment - Potential PIS and COFINS credit | R$ (96,461)

X
- Definition The amount of lease liabilities. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesOne
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of lease liabilities potencial PIS and COFINS credit. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesPotencialPISAndCOFINSCredit
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of present value adjustment in leases. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesPresentValueAdjustmentsOne
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of present value adjustment in leases PIS and COFINS credit. + References No definition available. + Details
Name: | sid_LeaseLiabilitiesPresentValueAdjustmentsleasesPISAndCOFINSCredit
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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