XML 392 R184.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of reconciliation of the healthcare liabilities (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IfrsStatementLineItems [Line Items] |  |  |
Actuarial liability at the beginning of the year | R$ 758,426 |  |
Actuarial liability at the end of the year | 584,288 | R$ 758,426 |
Post Employment Healthcare Benefits [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Actuarial liability at the beginning of the year | 678,880 | 892,396 | R$ 897,137
Expenses recognized in income for the year | 42,355 | 57,731 | 69,907
Sponsor's contributions transferred in prior year | (73,324) | (81,340) | (82,081)
Recognition of actuarial loss/(gain) | (63,623) | (189,907) | 7,433
Actuarial liability at the end of the year | R$ 584,288 | R$ 678,880 | R$ 892,396

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

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

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

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