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6. TRADE RECEIVABLES (Details 1) - Third parties [member] - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	R$ 2,974,524	R$ 2,122,537
Current [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	2,537,567	1,739,746
Past-due up to 30 days [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	222,972	132,845
Past-due up to 180 days [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	17,915	23,877
Past-due over 180 days [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	R$ 196,070	R$ 226,069

X

- Definition

The amount of gross trade receivable.

+ References

No definition available.

+ Details

Name:	sid_GrossTradeReceivable
Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=sid_ThirdPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_CurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_PastDueStatusAxis=sid_NotLaterThanOneMonthsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanThreeMonthsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: