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6. TRADE RECEIVABLES (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
TradeAndOtherReceivablesLineItems [Line Items]
Allowance for doubtful debts	R$ (228,348)	R$ (245,194)	R$ (237,352)
Trade receivable, after allowance for doubtful debts	2,746,176	1,877,343
Trade receivables	2,867,352	2,047,931
Third parties [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	2,974,524	2,122,537
Third parties [member] | Domestic Market [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	910,657	1,118,632
Third parties [member] | Foreign Market [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivable, before allowance for doubtful debts	2,063,867	1,003,905
Related Parties [member]
TradeAndOtherReceivablesLineItems [Line Items]
Trade receivables	R$ 121,176	R$ 170,588

X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount due from customers for goods and services sold.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2020-01-01

+ Details

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Balance Type:	debit
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X

- Definition

The amount of gross trade receivable.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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X

- References

No definition available.

+ Details

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Namespace Prefix:	sid_
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Period Type:	instant

X

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