XML 109 R152.htm IDEA: XBRL DOCUMENT
v3.20.1

18 RELATED-PARTY BALANCES AND TRANSACTIONS (Details 6) € in Thousands, R$ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 BRL (R$) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€)
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Borrowings | R$ 15,695,779 |  |  | R$ 15,565,802 |  |
Tax foreclosure | 41,004 |  |  | 38,498 |  |
Others | 10,857 |  |  | 22,093 |  |
Total | 16,143,493 |  |  | 15,626,393 |  |
Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Borrowings | 12,033,973 |  |  | 11,976,657 |  |
Total | 12,429,826 |  |  | 11,976,657 |  |
Guarantees [Member] | Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Borrowings | 3,661,806 |  |  | 3,589,145 |  |
Tax foreclosure | 41,004 |  |  | 38,498 |  |
Others | 10,857 |  |  | 22,093 |  |
Total | R$ 3,713,667 |  |  | 3,649,736 |  |
Guarantees [Member] | Foreign Currency [Member] | United States of America, Dollars |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Borrowings | $ |  | $ 2,958,603 |  |  | $ 2,950,000 |
Total | $ |  | 2,958,603 |  |  | 2,950,000 |
Guarantees [Member] | Foreign Currency [Member] | Euro Member Countries, Euro |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Borrowings | € |  |  | € 24,000 |  |  | € 123,000
Total | € |  |  | 24,000 |  |  | 123,000
Guarantees [Member] | Transnordestina Logistica S.A [Member] | Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Up to 09/19/2056 and indefinite |  |  |  |  |
Borrowings | R$ 2,428,194 |  |  | 2,108,917 |  |
Tax foreclosure | 37,406 |  |  | 35,336 |  |
Others | 8,702 |  |  | 8,231 |  |
Total | R$ 2,474,302 |  |  | 2,152,484 |  |
Guarantees [Member] | FTL - Ferrovia Transnordestina [Member] | Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Up to 04/01/2021 |  |  |  |  |
Borrowings | R$ 43,118 |  |  | 62,407 |  |
Total | R$ 43,118 |  |  | 62,407 |  |
Guarantees [Member] | Cia Metalurgica Prada [Member] | Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Indefinite |  |  |  |  |
Tax foreclosure | R$ 457 |  |  | 333 |  |
Others | 235 |  |  | 11,942 |  |
Total | R$ 692 |  |  | 12,275 |  |
Guarantees [Member] | CSN Energia [Member] | Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Up to 11/26/2023 and indefinite |  |  |  |  |
Tax foreclosure | R$ 3,141 |  |  | 2,829 |  |
Others | 1,920 |  |  | 1,920 |  |
Total | R$ 5,061 |  |  | 4,749 |  |
Guarantees [Member] | CSN Mineracao [Member] | Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Up to 12/21/2024 |  |  |  |  |
Borrowings | R$ 1,184,048 |  |  | 1,407,363 |  |
Total | R$ 1,184,048 |  |  | 1,407,363 |  |
Guarantees [Member] | Estanho de Rondonia [Member] | Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | 7/15/2022 |  |  |  |  |
Borrowings | R$ 1,902 |  |  | 3,153 |  |
Total | R$ 1,902 |  |  | 3,153 |  |
Guarantees [Member] | Minerios Nacional S.A. [Member] | Local Currency [Member] |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Up to 09/10/2021 |  |  |  |  |
Borrowings | R$ 4,544 |  |  | 7,305 |  |
Total | R$ 4,544 |  |  | R$ 7,305 |  |
Guarantees [Member] | CSN Islands XI [Member] | Foreign Currency [Member] | United States of America, Dollars |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | 9/21/2019 |  |  |  |  |
Borrowings | $ |  |  |  |  | 547,094 |
Total | $ |  |  |  |  | 547,094 |
Guarantees [Member] | CSN Islands XII [Member] | Foreign Currency [Member] | United States of America, Dollars |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Perpetual |  |  |  |  |
Borrowings | $ |  | 1,000,000 |  |  | 1,000,000 |
Total | $ |  | 1,000,000 |  |  | 1,000,000 |
Guarantees [Member] | CSN Resources [Member] | Foreign Currency [Member] | United States of America, Dollars |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Up to 04/17/2026 |  |  |  |  |
Borrowings | $ |  | 1,958,603 |  |  | 1,402,906 |
Total | $ |  | $ 1,958,603 |  |  | $ 1,402,906 |
Guarantees [Member] | CSN Steel S.L. [Member] | Foreign Currency [Member] | Euro Member Countries, Euro |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | 1/31/2020 |  |  |  |  |
Borrowings | € |  |  | 24,000 |  |  | 48,000
Total | € |  |  | 24,000 |  |  | 48,000
Guarantees [Member] | Lusosider Acos Planos [Member] | Foreign Currency [Member] | Euro Member Countries, Euro |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |
Maturities | Indefinite |  |  |  |  |
Borrowings | € |  |  |  |  |  | 75,000
Total | € |  |  |  |  |  | € 75,000

X
- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_BorrowingsMaturity
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_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount refers to borrowings relaetd party. + References No definition available. + Details
Name: | sid_BorrowingsRelaetdParty
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount refers to others guarantees. + References No definition available. + Details
Name: | sid_OthersGuarantees
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount refers to tax foreclosure. + References No definition available. + Details
Name: | sid_TaxForeclosure
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount refers to total guarantees. + References No definition available. + Details
Name: | sid_TotalGuarantees
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | sid_FunctionalCurrencyAxis=sid_LocalCurrencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ContinuingInvolvementInDerecognisedFinancialAssetsByTypeOfInstrumentAxis=ifrs-full_GuaranteesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_FunctionalCurrencyAxis=sid_ForeignCurrencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_TransnordestinaLogisticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_FTLFerroviaTransnordestinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_CiaMetalurgicaPradaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_CSNEnergiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_CSNMineracaoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_EstanhoDeRondoniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_MineriosNacionalSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_CSNIslandsXIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_CSNIslandsXIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_CSNResourcesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_CSNSteelSLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=sid_LusosiderAcosPlanosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |