XML 142 R112.htm IDEA: XBRL DOCUMENT
v3.20.1

12. FINANCIAL INSTRUMENTS (Details 6) - Foreign Exchange Risk [Member] - Cash flow hedges [member] R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 BRL (R$) ExchangeRate
Disclosure of detailed information about financial instruments [line items] |  |
Designated amounts | R$ 4,087,804 |
Amortized part | (1,557,091) |
Effect on Result | (790,353) | [1]
Impact on Shareholders' equity | R$ (1,255,770) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 11/03/2014 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | October 2016 - September 2019 |
Exchange rate on designation | ExchangeRate | 2.4442 |
Designated amounts | R$ 500,000 |
Amortized part | (500,000) |
Effect on Result | R$ (384,346) | [1]
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 12/01/2014 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | October 2015 - February 2019 |
Exchange rate on designation | ExchangeRate | 2.5601 |
Designated amounts | R$ 175,000 |
Amortized part | (175,000) |
Effect on Result | R$ (23,184) | [1]
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 12/18/2014 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | May 2020 |
Exchange rate on designation | ExchangeRate | 2.6805 |
Designated amounts | R$ 30,000 |
Impact on Shareholders' equity | R$ (40,506) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 12/18/2014 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | May 2020 |
Exchange rate on designation | ExchangeRate | 2.6780 |
Designated amounts | R$ 35,000 |
Impact on Shareholders' equity | R$ (47,345) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 12/18/2014 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | May 2020 |
Exchange rate on designation | ExchangeRate | 2.6760 |
Designated amounts | R$ 35,000 |
Impact on Shareholders' equity | R$ (47,409) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 07/21/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | July 2019 - March 2021 |
Exchange rate on designation | ExchangeRate | 3.1813 |
Designated amounts | R$ 60,000 |
Amortized part | (15,000) |
Effect on Result | (11,254) | [1]
Impact on Shareholders' equity | R$ (38,223) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 07/23/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | July 2019 - March 2021 |
Exchange rate on designation | ExchangeRate | 3.2850 |
Designated amounts | R$ 100,000 |
Amortized part | (25,000) |
Effect on Result | (14,676) | [1]
Impact on Shareholders' equity | R$ (55,928) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 07/23/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | October 2018 - October 2022 |
Exchange rate on designation | ExchangeRate | 3.2850 |
Designated amounts | R$ 30,000 |
Amortized part | (12,000) |
Effect on Result | (4,315) | [1]
Impact on Shareholders' equity | R$ (13,423) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 07/24/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | October 2018 - October 2022 |
Exchange rate on designation | ExchangeRate | 3.3254 |
Designated amounts | R$ 100,000 |
Amortized part | (40,000) |
Effect on Result | (13,574) | [1]
Impact on Shareholders' equity | R$ (42,318) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 07/27/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | October 2018 - October 2022 |
Exchange rate on designation | ExchangeRate | 3.3557 |
Designated amounts | R$ 25,000 |
Amortized part | (10,000) |
Effect on Result | (3,242) | [1]
Impact on Shareholders' equity | R$ (10,125) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 07/27/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | October 2018 - October 2022 |
Exchange rate on designation | ExchangeRate | 3.3557 |
Designated amounts | R$ 70,000 |
Amortized part | (28,000) |
Effect on Result | (9,077) | [1]
Impact on Shareholders' equity | R$ (28,350) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 07/27/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | October 2018 - October 2022 |
Exchange rate on designation | ExchangeRate | 3.3557 |
Designated amounts | R$ 30,000 |
Amortized part | (12,000) |
Effect on Result | (3,890) | [1]
Impact on Shareholders' equity | R$ (12,150) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 07/28/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | October 2018 - October 2022 |
Exchange rate on designation | ExchangeRate | 3.3815 |
Designated amounts | R$ 30,000 |
Amortized part | (12,000) |
Effect on Result | (4,004) | [1]
Impact on Shareholders' equity | R$ (11,686) |
Export Prepayments In Us$ To Third Parties [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 3/8/2015 |
Hedging instrument | Export prepayments in US$ to third parties |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | Outubro de 2018 a Outubro de 2022 |
Exchange rate on designation | ExchangeRate | 3.3940 |
Designated amounts | R$ 355,000 |
Amortized part | (84,091) |
Effect on Result | (12,990) | [1]
Impact on Shareholders' equity | R$ (172,488) |
Bond [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 4/2/2018 |
Hedging instrument | Bonds |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | July 2018 - February 2023 |
Exchange rate on designation | ExchangeRate | 3.3104 |
Designated amounts | R$ 1,170,045 |
Amortized part | (644,000) |
Effect on Result | (305,801) | [1]
Impact on Shareholders' equity | R$ (378,915) |
Bonds and Export prepayments in US$ [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Designation date | 7/31/2019 |
Hedging instrument | Bonds and Export prepayments in US$ |
Hedged item | Part of the highly probable future monthly iron ore exports |
Type of hedged risk | Foreign exchange - R$ vs. US$ spot rate |
Hedged period | January 2020 - April 2026 |
Exchange rate on designation | ExchangeRate | 3.7649 |
Designated amounts | R$ 1,342,759 |
Impact on Shareholders' equity | R$ (356,904) |
[1] | In 2019, was recognized in other operating, the amount of (R$790,353). On December 31,2018 was (R$370,191).

X
- Definition The average price of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 23B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_23B_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_AveragePriceOfHedgingInstrument
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The description 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: Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets] + 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_DescriptionOfFinancialInstrumentsDesignatedAsHedgingInstrument
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The description of the nature of risks being hedged. + 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 c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_c&doctype=Standard&book=b -URIDate 2019-03-27 + Details
Name: | ifrs-full_DescriptionOfNatureOfRisksBeingHedged
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The description of periods when cash flows are expected to occur for cash flow hedges. [Refer: Cash flow 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 23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_23_a&doctype=Standard&book=b -URIDate 2019-03-27 + Details
Name: | ifrs-full_DescriptionOfPeriodsWhenCashFlowsExpectedToOccur
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The description of the type of a hedge used by the entity. + 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 a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_a&doctype=Standard&book=b -URIDate 2019-03-27 + Details
Name: | ifrs-full_DescriptionOfTypeOfHedge
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24B_a_i&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_HedgedItemAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of other comprehensive income, net of tax, related to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount refers to effect on financial instruments designated as hedging instruments. + References No definition available. + Details
Name: | sid_EffectOnFinancialInstrumentsDesignatedAsHedgingInstruments
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount refers to financial instruments designated as hedging instruments at fair value amortization. + References No definition available. + Details
Name: | sid_FinancialInstrumentsDesignatedAsHedgingInstrumentsAtFairValueAmortization
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount refers to hedging relationship designation date. + References No definition available. + Details
Name: | sid_HedgingRelationshipDesignationDate
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_TypesOfHedgesAxis=ifrs-full_CashFlowHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesTenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesTwelveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_ExportPrepaymentsInUsToThirdPartiesThirteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_BondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=sid_BondsandExportprepaymentsinUSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |