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26. EXPENSES BY NATURE (Details Narrative) - Iron ore [member] R$ in Thousands	12 Months Ended
	Dec. 31, 2020 BRL (R$)
ExpenseByNatureLineItems [Line Items]
Percentage of production process	100.00%
Book balance of assets	R$ 515,491
Lease agreements [member]
ExpenseByNatureLineItems [Line Items]
Cost of production	R$ 5,335

X

- Definition

Represent information about the book balance of assets.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of cost of production.

+ References

No definition available.

+ Details

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Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

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Namespace Prefix:	sid_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represent information about the percentage of production process.

+ References

No definition available.

+ Details

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Namespace Prefix:	sid_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=sid_IronOreMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: