XML 126 R114.htm IDEA: XBRL DOCUMENT v3.8.0.1

12. FINANCIAL INSTRUMENTS (Details 10)	Dec. 31, 2017 R$ / $ R$ / €
USD
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / $	3.3080
USD | Probable Scenario
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / $	3.2381
USD | Scenario 1
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / $	4.1350
USD | Scenario 2
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / $	4.9620
EUR
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / €	3.9693
EUR | Probable Scenario
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / €	4.0295
EUR | Scenario 1
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / €	4.9616
EUR | Scenario 2
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Exchange rate | R$ / €	5.9540

X

- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ClosingForeignExchangeRate
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

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_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	SID_CurrenciesAxis=SID_USDMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=SID_ProbableScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=SID_Scenario1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=SID_Scenario2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	SID_CurrenciesAxis=SID_EURMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: