XML 391 R183.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of post-employment health care plan amounts (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
IfrsStatementLineItems [Line Items] |  |  |  |
Actuarial liabilities | R$ 584,288 | R$ 758,426 |  |
Post Employment Healthcare Benefits [Member] |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |
Present value of obligations | 584,288 | 678,880 | R$ 892,396 |
Actuarial liabilities | R$ 584,288 | R$ 678,880 | R$ 892,396 | R$ 897,137

X
- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DefinedBenefitObligationAtPresentValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_LiabilitiesOfBenefitPlan
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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