XML 131 R99.htm IDEA: XBRL DOCUMENT v3.25.1

INTANGIBLE ASSETS (Details 1)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Computer software [member]
IfrsStatementLineItems [Line Items]
Average useful lives	8 years	10 years
Customer-related intangible assets [member]
IfrsStatementLineItems [Line Items]
Average useful lives	13 years	13 years

X

- Definition

The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_CustomerrelatedIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: