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12. FINANCIAL INSTRUMENTS (Details 5) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Finance income (expenses), net	R$ 185,525	R$ (1,045,771)	R$ 41,153
Foreign Exchange Risk [Member]
Disclosure of detailed information about financial instruments [line items]
Total	5,567
Finance income (expenses), net	4,986
Foreign Exchange Risk [Member] | Current Financial Asset [Member]
Disclosure of detailed information about financial instruments [line items]
Total	1,364
Foreign Exchange Risk [Member] | Non Current Financial Asset [Member]
Disclosure of detailed information about financial instruments [line items]
Total	R$ 4,203
Foreign Exchange Risk [Member] | Dollar-to-Euro Swap [Member]
Disclosure of detailed information about financial instruments [line items]
Instruments	Dollar to euro swap
Total	R$ 1,364
Finance income (expenses), net	R$ 783
Foreign Exchange Risk [Member] | Dollar-to-Euro Swap [Member] | Current Financial Asset [Member]
Disclosure of detailed information about financial instruments [line items]
Instruments	Dollar to euro swap
Total	R$ 1,364
Foreign Exchange Risk [Member] | Swap CDI x Dollar [Member]
Disclosure of detailed information about financial instruments [line items]
Instruments	Swap CDI x dollar
Total	R$ 4,203
Finance income (expenses), net	R$ 4,203
Foreign Exchange Risk [Member] | Swap CDI x Dollar [Member] | Non Current Financial Asset [Member]
Disclosure of detailed information about financial instruments [line items]
Instruments	Swap CDI x dollar
Total	R$ 4,203

X

- Definition

The description of the line item in the statement of financial position that includes the hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 24A
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_b&doctype=Standard
-URIDate 2019-03-27

+ Details

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Balance Type:	na
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X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 22
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b
-URIDate 2019-03-27

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Balance Type:	na
Period Type:	instant

X

- Definition

The gains (losses) on hedging instruments in fair value hedges. [Refer: Fair value hedges [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 24
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_24_a_i&doctype=Standard&book=b
-URIDate 2019-03-27

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=sid_CurrentFinancialAssetMember
Namespace Prefix:
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Balance Type:
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X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=sid_NonCurrentFinancialAssetMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=sid_DollarToEuroSwapMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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