XML 197 R165.htm IDEA: XBRL DOCUMENT v3.25.1

EMPLOYEE BENEFITS (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2024	Dec. 31, 2023
IfrsStatementLineItems [Line Items]
Actuarial assets	R$ (47,708)	R$ (39,530)
Actuarial liabilities	473,046	503,889
Benefits Of Pension Plans [Member]
IfrsStatementLineItems [Line Items]
Actuarial assets	(47,708)	(39,530)
Actuarial liabilities	18,884	22,771
Post Employment Healthcare Benefits [Member]
IfrsStatementLineItems [Line Items]
Actuarial liabilities	R$ 454,162	R$ 481,118

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	sid_LiabilityOfBenefitPlan
Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=sid_BenefitsOfPensionPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=sid_PostEmploymentHealthcareBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: