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v3.22.1

INSURANCE (Details Narrative) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 BRL (R$)
Indemnity limit | R$ 475
Deductible material damages | R$ 385

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

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