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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