XML 253 R194.htm IDEA: XBRL DOCUMENT v3.23.1

EMPLOYEE BENEFITS (Details 9) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
IfrsStatementLineItems [Line Items]
Allocation of plan assets	R$ 3,572,869	R$ 3,584,243	R$ 3,766,193
Plan assets percentage	100.00%	100.00%	100.00%
Variable Income [Member]
IfrsStatementLineItems [Line Items]
Allocation of plan assets	R$ 193,948	R$ 195,032	R$ 54,285
Plan assets percentage	5.43%	5.44%	1.44%
Fixed Income [Member]
IfrsStatementLineItems [Line Items]
Allocation of plan assets	R$ 3,106,206	R$ 3,127,736	R$ 3,438,735
Plan assets percentage	86.94%	87.26%	91.31%
Real Estates [Member]
IfrsStatementLineItems [Line Items]
Allocation of plan assets	R$ 207,223	R$ 190,474	R$ 182,145
Plan assets percentage	5.80%	5.31%	4.84%
Others Plan Assets [Member]
IfrsStatementLineItems [Line Items]
Allocation of plan assets	R$ 65,492	R$ 71,001	R$ 91,028
Plan assets percentage	1.83%	1.98%	2.42%

X

- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2022-03-24
-Paragraph 57
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_PlanAssetsAtFairValue
Namespace Prefix:	ifrs-full_
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_PlanAssetsPercentage
Namespace Prefix:	sid_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	sid_DefinedBenefitPlanByPlanAssetsCategoriesAxis=sid_VariableIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sid_DefinedBenefitPlanByPlanAssetsCategoriesAxis=sid_FixedIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sid_DefinedBenefitPlanByPlanAssetsCategoriesAxis=sid_RealEstatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sid_DefinedBenefitPlanByPlanAssetsCategoriesAxis=sid_OthersPlanAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: