XML 102 R83.htm IDEA: XBRL DOCUMENT v3.21.1

9. OTHER CURRENT AND NON-CURRENT ASSETS (Details Narrative) R$ in Thousands	12 Months Ended
	Dec. 31, 2020 BRL (R$)
OtherCurrentAndNonCurrentAssetsLineItems [Line Items]
Receivable for indemnification	R$ 147,612
financial result	369,571
Eletrobras's compulsory loan [member]
OtherCurrentAndNonCurrentAssetsLineItems [Line Items]
Recovery of additional credits	R$ 350,000

X

- Definition

The amount of financial result.

+ References

No definition available.

+ Details

Name:	sid_FinancialResult
Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of recovery of additional credits.

+ References

No definition available.

+ Details

Name:	sid_GainOnRecoveryOfCredits
Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	sid_OtherCurrentAndNonCurrentAssetsLineItems
Namespace Prefix:	sid_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of receivable for indemnification.

+ References

No definition available.

+ Details

Name:	sid_ReceivableForIndemnification
Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=sid_MonetaryAdjustmentRelatedToTheEletrobrassCompulsoryLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: