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28 INSURANCE (Details Narrative) R$ in Thousands	12 Months Ended
	Dec. 31, 2019 BRL (R$)
Insurance [Abstract]
Amount of insured assets	R$ 600
Description of insured assets	The maximum limit of indemnity is US$600 million and deductibles in the amount of US$385 million for material damages.

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- Definition

Amount refers to the insured asstes.

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No definition available.

+ Details

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

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- Definition

Information by description of insured assets.

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No definition available.

+ Details

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

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No definition available.

+ Details

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