XML 111 R92.htm IDEA: XBRL DOCUMENT
v3.21.1

10. BASIS OF CONSOLIDATION AND INVESTMENTS IN SUBSIDIARIES AND AFFILIATES (Details Narrative) - BRL (R$) R$ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 29, 2019 | Nov. 13, 2019 | Nov. 30, 2015 | May 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Net loss |  |  |  |  | R$ 4,292,618 | R$ 2,244,511 | R$ 5,200,583
Property, plant and equipment, net of depreciation |  |  |  |  | 19,716,223 | 19,700,944 | R$ 18,046,864
Fair value of investment properties |  |  |  |  | R$ 1,863,563 | 1,781,019 |
Class B preferred shares [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Total number of shares transfer |  |  |  | 1,677,816 |  |  |
Number of shares transfer to CSN |  |  |  | 501,789 |  |  |
Common shares [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of stake |  |  |  |  | 15.19% |  |
Preferred shares [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of stake |  |  |  |  | 20.29% |  |
COMPANHIA BRASILEIRA DE INFRASTRUCTURE SERVICES [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of interest | 50.00% |  |  |  |  |  |
Acquisition shares amount | R$ 24,000 |  |  |  |  |  |
Goodwill | R$ 15,225 |  |  |  |  |  |
Transnordestina logistica s.a [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of interest |  |  |  |  | 47.26% |  |
Percentage of voting capital |  |  |  |  | 92.60% |  |
Equimac S.A [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of stake |  |  |  |  | 50.00% |  |
PANATLANTICA SA [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of interest |  |  |  |  | 11.31% |  |
Arvedi Metalfer do Brasil S.A. [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of stake |  |  |  |  | 20.00% |  |
FTL - FERROVIA TRANSNORDESTINA LOGISTICA SA ("FTL") [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Subscribed shares amount |  | R$ 27,670 |  |  |  |  |
Net loss |  | R$ 293 |  |  |  |  |
FTL - FERROVIA TRANSNORDESTINA LOGISTICA SA ("FTL") [member] | Bottom of range [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of interest |  | 91.69% |  |  |  |  |
FTL - FERROVIA TRANSNORDESTINA LOGISTICA SA ("FTL") [member] | Top of range [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of interest |  | 92.38% |  |  |  |  |
MRS. [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of stake |  |  | 18.63% |  |  |  |
CSN Mineracao SA [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of interest |  |  | 87.52% |  |  |  |
CKTR Brasil Servicos Ltda [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of stake |  |  |  |  | 50.00% |  |
ENGIE Brasil Energia S.A [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of interest |  |  |  |  | 48.75% |  |
MRS Logistica S.A. [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Concession term |  |  |  |  | 30 years |  |
Description of holding in other entity |  |  |  |  | The Company directly holds an 18.64% interest in the capital of MRS and indirectly, through its subsidiary CSN Mineracao SA, a 16.30% interest in the capital of MRS, totaling a 34.94% interest. |  |
CONSORCIO DA USINA HIDRELETRICA DE IGARAPAVA [member] |  |  |  |  |  |  |
BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems [Line Items] |  |  |  |  |  |  |
Percentage of interest |  |  |  |  | 17.92% |  |
Property, plant and equipment, net of depreciation |  |  |  |  | R$ 21,287 | 22,441 |
Expense |  |  |  |  | R$ 6,611 | R$ 6,497 |

X
- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_a&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_135_a&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_Goodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_18_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2020-01-01 -Paragraph 32 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_32_a_ii&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_b&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 39L -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_39L_e&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23&doctype=Standard -URIDate 2020-01-01 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d_i&doctype=Standard -URIDate 2020-01-01 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2021-01-01 -Name IFRS -Number 17 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2020-en-r&anchor=para_113_b&doctype=Standard -URIDate 2020-01-01 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 81A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_81A_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProfitLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_PropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of cost related to the issuance of shares. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ShareIssueRelatedCost
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of acquisition shares amount. + References No definition available. + Details
Name: | sid_AcquisitionSharesAmount
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | sid_BasisOfConsolidationAndInvestmentsInSubsidiariesAndAffiliatesLineItems
Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent information about the concession term. + References No definition available. + Details
Name: | sid_ConcessionTerm
Namespace Prefix: | sid_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent information about the description of holding in other entity. + References No definition available. + Details
Name: | sid_DescriptionOfHoldingInOtherEntity
Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of fair value of investment properties. + References No definition available. + Details
Name: | sid_FairValueOfInvestmentProperties
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about the number of shares transfer. + References No definition available. + Details
Name: | sid_NumberOfSharesTransfer
Namespace Prefix: | sid_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent information about the number of shares transfer one. + References No definition available. + Details
Name: | sid_NumberOfSharesTransferOne
Namespace Prefix: | sid_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of other expense. + References No definition available. + Details
Name: | sid_OtherExpense
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represent information about the percentage of interest. + References No definition available. + Details
Name: | sid_PercentageOfInterest
Namespace Prefix: | sid_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represent information about the percentage of stakes. + References No definition available. + Details
Name: | sid_PercentageOfStakes
Namespace Prefix: | sid_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represent information about the percentage of voting capital. + References No definition available. + Details
Name: | sid_PercentageOfVotingCapital
Namespace Prefix: | sid_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=sid_ClassBPreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=sid_CommonSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=sid_PreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_COMPANHIABRASILEIRADEINFRASTRUCTURESERVICESMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_TransLogisticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_EquimacSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_PANATLANTICASAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sid_ArvediMetalferDoBrasilSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_LegalEntityOneAxis=sid_FTLFerroviaTransnordestinaLogisticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_LegalEntityOneAxis=sid_FtlFerroviaTransnordestionaLogisticAsaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_LegalEntityOneAxis=sid_MRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_LegalEntityOneAxis=sid_CSNMineracaoSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_LegalEntityOneAxis=sid_CKTRBrasilServicosLtdaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_LegalEntityOneAxis=sid_ENGIEBrasilEnergiaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_LegalEntityOneAxis=sid_MRSLogisticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sid_LegalEntityOneAxis=sid_ConsorcioDaUsinaHidreletricaDeIgarapavaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |