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14. INCOME TAX AND SOCIAL CONTRIBUTION (Details 4) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax And Social Contribution Details 4
Actuarial gains on defined benefit pension plan	R$ 171,473	R$ 30,234
Estimated losses for deferred income and social contribution tax credits - actuarial gains	(175,649)	(33,400)
Changes in the fair value on available-for-sale financial assets	(525,107)	(33,796)
Actuarial gains and assets available for sale by incorporation	525,107	33,796
Exchange differences on translating foreign operations	(369,017)	(425,510)
Cash flow hedge accounting	134,478	109,813
Estimated losses for deferred income and social contribution tax credits - cash flow hedge	(134,478)	(109,813)
Income tax and social contribution	R$ (373,193)	R$ (428,676)

X

- Definition

The amount of income tax relating to actuarial Gains and assets available for sale by incorporation charged or credited directly to equity.

+ References

No definition available.

+ Details

Name:	SID_IncomeTaxRelatingToActuarialGainsAndAssetsAvailableForSaleByIncorporationChargedOrCreditedDirectlyToEquity
Namespace Prefix:	SID_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of income tax relating to gains losses on cash flow hedges net of tax charged directly to equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	SID_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of income tax relating to gains losses on exchange differences on translation charged or credited directly to equity.

+ References

No definition available.

+ Details

Name:	SID_IncomeTaxRelatingToGainsLossesOnExchangeDifferencesOnTranslationChargedOrCreditedDirectlyToEquity
Namespace Prefix:	SID_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of income tax relating to gains losses on remeasurements of defined benefit plans charged or credited directly to equity.

+ References

No definition available.

+ Details

Name:	SID_IncomeTaxRelatingToGainsLossesOnRemeasurementsOfDefinedBenefitPlansChargedOrCreditedDirectlyToEquity
Namespace Prefix:	SID_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of income tax relating to hedges of investment in equity instrument charged or credited directly to equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	SID_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of income tax relating to investment in equity instrument charged or credited directly to equity.

+ References

No definition available.

+ Details

Name:	SID_IncomeTaxRelatingToInvestmentsInEquityInstrumentsChargedOrCreditedDirectlyToEquity
Namespace Prefix:	SID_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of income tax relating to remeasurements of define benefit plans charged or credited directly to equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	SID_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	SID_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate current and deferred tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Deferred tax relating to items credited (charged) directly to equity; Retained earnings; Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2017-01-01
-Paragraph 81
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_a&doctype=Standard
-URIDate 2017-03-09

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