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v3.22.1

Schedule of provision for inventory losses (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Opening balance | R$ (109,038) | R$ (134,553)
(Estimated losses) / Reversal of inventories with low turnover and obsolescence | 10,308 | 25,515
Closing balance | R$ (98,730) | R$ (109,038)

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

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