XML 247 R188.htm IDEA: XBRL DOCUMENT
v3.23.1

EMPLOYEE BENEFITS (Details 3) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |  |
Fair value of plan assets at the beginning of the year | R$ 3,584,243 | R$ 3,766,193 |
Return on plan assets (less interest income) | 135,210 | 138,488 | R$ 109,279
Fair value of plan assets at the end of the year | 3,572,869 | 3,584,243 | 3,766,193
Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Fair value of plan assets at the beginning of the year | (3,584,244) | (3,766,193) | (3,894,488)
Consolidation of CSN Cimentos Brasil | (63,292) |  |
Interest income | (369,488) | (238,534) | (257,946)
Benefits paid | 310,471 | 283,393 | 278,960
Participant contributions made in the period | (1,382) | (1,398) | (1,998)
Employer contributions made in the year | (144) |  |
Return on plan assets (less interest income) | 135,210 | 138,488 | 109,279
Fair value of plan assets at the end of the year | R$ (3,572,869) | R$ (3,584,244) | R$ (3,766,193)

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
- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 141 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_BenefitsPaidOrPayables
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_ConsolidationsOfCsnCimentosBrasil
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAssets
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_EmployerContributionsMadeInYear
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
- References No definition available. + Details
Name: | sid_InterestIncomeNetDefinedBenefitLiabilityAsset
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=ifrs-full_DefinedBenefitPlansOtherThanMultiemployerPlansStatePlansAndPlansThatShareRisksBetweenEntitiesUnderCommonControlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |