XML 97 R110.htm IDEA: XBRL DOCUMENT
v3.20.1

12. FINANCIAL INSTRUMENTS (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items] |  |  |
Impact on finance income (expenses) | R$ 185,525 | R$ (1,045,771) | R$ 41,153
Foreign Exchange Risk [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Asset position | 350,308 |  |
Liability position | (344,741) |  |
Fair market value of amounts receivable/(payable) | 5,567 |  |
Impact on finance income (expenses) | R$ 4,986 |  |
Foreign Exchange Risk [Member] | Dollar-to-Euro Swap [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Counterparties name | Total Dollar-to-Euro swap |  |
Notional amount | R$ 12,875 |  |
Asset position | 51,923 |  |
Liability position | (50,559) |  |
Fair market value of amounts receivable/(payable) | 1,364 |  |
Impact on finance income (expenses) | R$ 783 |  |
Foreign Exchange Risk [Member] | Swap CDI x Dollar [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Counterparties name | Total Swap CDI x dollar |  |
Notional amount | R$ 67,000 |  |
Asset position | 298,385 |  |
Liability position | (294,182) |  |
Fair market value of amounts receivable/(payable) | 4,203 |  |
Impact on finance income (expenses) | R$ 4,203 |  |
Foreign Exchange Risk [Member] | BCP [Member] | Dollar-to-Euro Swap [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Counterparties name | BCP |  |
Maturity | Feb. 07, 2020 |  |
Functional Currency | Dollar |  |
Notional amount | R$ 12,875 |  |
Asset position | 51,923 |  |
Liability position | (50,559) |  |
Fair market value of amounts receivable/(payable) | 1,364 |  |
Impact on finance income (expenses) | R$ 783 |  |
Foreign Exchange Risk [Member] | Bradesco [Member] | Swap CDI x Dollar [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Counterparties name | Bradesco |  |
Maturity | Oct. 02, 2023 |  |
Functional Currency | Dollar |  |
Notional amount | R$ 67,000 |  |
Asset position | 298,385 |  |
Liability position | (294,182) |  |
Fair market value of amounts receivable/(payable) | 4,203 |  |
Impact on finance income (expenses) | R$ 4,203 |  |

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

X
- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
Name: | ifrs-full_FinancialInstrumentsDesignatedAsHedgingInstrumentsAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The gains (losses) on hedging instruments in fair value hedges. [Refer: Fair value hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_24_a_i&doctype=Standard&book=b -URIDate 2019-03-27 + Details
Name: | ifrs-full_GainsLossesOnHedgingInstrument
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_HedgingInstrumentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_HedgingInstrumentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount refers to hedging instrument functional currency. + References No definition available. + Details
Name: | sid_HedgingInstrumentFunctionalCurrency
Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount refers to hedging instrument maturity term. + References No definition available. + Details
Name: | sid_HedgingInstrumentMaturityTerm
Namespace Prefix: | sid_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount refers to hedging instrument name o f counterparties. + References No definition available. + Details
Name: | sid_HedgingInstrumentNameOFCounterparties
Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=sid_DollarToEuroSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=sid_SwapCDIDollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=sid_BCPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=sid_BradescoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |