XML 180 R169.htm IDEA: XBRL DOCUMENT
v3.19.1

27. EMPLOYEE BENEFITS (Details 13) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items] |  |
Actuarial liability at the beginning of the year | R$ 908,721 |
Actuarial liability at the end of the year | 905,119 | R$ 908,721
Post-employment healthcare benefits |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Actuarial liability at the beginning of the year | 866,784 | 691,262
Expenses recognized in income for the year | 85,748 | 77,269
Sponsor's contributions transferred in prior year | (71,632) | (72,192)
Recognition of actuarial loss/ (gain) | 16,237 | 170,445
Actuarial liability at the end of the year | R$ 897,137 | R$ 866,784

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_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
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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