XML 146 R113.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

BASIS OF CONSOLIDATION AND INVESTMENTS (Details Narrative) - BRL (R$) R$ / shares in Units, R$ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2023 | Dec. 15, 2022 | Oct. 21, 2022 | Mar. 23, 2021 | Feb. 17, 2021 | Jan. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2023 | Jul. 31, 2022 | May 18, 2022 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
[custom:NetEquity-0] |  |  |  |  |  |  |  |  |  |  | R$ 2,383,276 |  |  |
Capital reserve |  |  |  |  |  |  |  | R$ 32,720 | R$ 32,720 |  |  |  |  |
Number of shares sold by CSN |  |  |  |  |  |  |  | 377,804,907 |  |  |  |  |  |
Number of share before initial public offering |  |  |  |  |  |  |  | 5,430,057,060 |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  |  |  |  |  |  | 6,381,908 |  |
Cancellation of nominative common shares |  |  |  |  |  |  |  |  |  |  |  |  | 105,907,300 |
Value on closing of transaction | R$ 114,763,385 |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse impairment of fair value |  |  |  |  |  |  |  | R$ 387,989 |  |  |  |  |  |
Investment property |  |  |  |  |  |  |  | 205,954 | 159,080 | R$ 162,181 |  |  |  | R$ 162,181
Investment property [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment property |  |  |  |  |  |  |  | R$ 2,235,614 | R$ 2,163,610 |  |  |  |  |
C S N Mineracao [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  |  | 161,189,078 |  |  |  |  |  |
Number of value issued |  |  |  |  |  |  |  | R$ 1,370,107 |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  | R$ 1,347,862 |  |  |  |  |  |
Issuance of diluted shares |  |  |  |  |  |  |  | 161,189,078 |  |  |  |  |  |
C S N Mineracao S A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stake percentage |  |  |  |  |  |  |  | 79.75% | 79.75% |  |  |  |  |
Companhia Estadual De Geracaode Energia Eletrica C E E E G [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stake percentage |  | 32.73% | 66.23% |  |  |  |  | 99.99% |  |  |  |  |  |
C S N Cimentos Brasil S A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stake percentage |  |  |  |  |  |  |  | 99.99% |  |  |  |  |  |
C S N Mineracao [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  | 9.30% | 79.75% | 78.24% |  |  |  |  |
Number of shares sold |  |  |  |  | 161,189,078 |  |  |  |  |  |  |  |  |
Number of shares sold by CSN |  |  |  |  | 422,961,066 |  | 377,804,907 |  |  |  |  |  |  |
Number of shares sold by CSN |  |  |  |  | 372,749,743 |  |  |  |  |  |  |  |  |
Number of share before initial public offering |  |  |  |  | 50,211,323 |  |  |  |  |  |  |  |  |
Price per share |  |  |  |  | R$ 8.50 |  |  |  |  |  |  |  |  |
Number of value issued |  |  |  |  |  |  | R$ 3,211,342 |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  | R$ 3,164,612 |  |  |  |  |  |  |
C S N Mineracao [Member] | Ordinary shares [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold by CSN |  |  |  |  |  |  | 50,211,323 |  |  |  |  |  |  |
Ita Energetica S A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 48.75% |  |  |  |  |  |
M R S Logistica S A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 37.27% |  |  |  |  |  |
M R S Logistica S A [Member] | Indirect Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 18.64% |  |  |  |  |  |
M R S Logistica S A [Member] | Direct Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 14.86% |  |  |  |  |  |
Consorcio Da Usina Hidreletrica De Igarapava [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 17.92% |  |  |  |  |  |
Consorcio Da Usina Hidreletrica De Itauba [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Consorcio Da Usina Hidreletrica De Itauba [Member] | Indirect Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 63.40% |  |  |  |  |  |
Consorcio Da Usina Hidreletrica De Itauba [Member] | Direct Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 36.60% |  |  |  |  |  |
Consorcio Da Usina Hidreletrica De Passo Real [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Consorcio Da Usina Hidreletrica De Passo Real [Member] | Indirect Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 53.03% |  |  |  |  |  |
Consorcio Da Usina Hidreletrica De Passo Real [Member] | Direct Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 46.97% |  |  |  |  |  |
Panatlantica S A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  |  | 11.31% | 11.31% |  |  |  |
Arvedi Metalfer Do Brasil S A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |
C S N Cimentos Brasil S A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
[custom:NetEquity-0] |  |  |  |  |  |  |  | R$ 2,383,275,916 |  |  |  |  |  |
[custom:ShareCapital-0] |  |  |  |  |  |  |  | 2,300,489,487 |  |  |  |  |  |
Capital reserve |  |  |  |  |  |  |  | R$ 82,786,429 |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 99.99% | 99.99% |  |  |  |  |
F T L Ferrovia Transnordestina Logistica S A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  |  |  |  |  | 92.71% | 92.71% |  |  |  |  |
F T L Ferrovia Transnordestina Logistica S A [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advances for future capital |  |  |  | R$ 10,860 |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  | 92.38% |  |  |  |  |  |  |  |  |  |
Other comprehensive income |  |  |  | R$ 29 |  |  |  |  |  |  |  |  |  |
F T L Ferrovia Transnordestina Logistica S A [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest in subsidiary |  |  |  | 92.71% |  |  |  |  |  |  |  |  |  |
C S N Cimentos [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
IfrsStatementLineItems [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital increased |  |  |  |  |  | R$ 2,956,094 |  |  |  |  |  |  |  |
Issuance of new common shares |  |  |  |  |  | 2,956,094,491 |  |  |  |  |  |  |  |

X
- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2023-01-01 -Paragraph 70 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2023-en-r&anchor=para_70_b&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_AdjustedWeightedAverageShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition A component of equity representing the capital reserves. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_CapitalReserve
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2023-01-01 -Paragraph 76 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2023-en-r&anchor=para_76&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2023-en-r&anchor=para_79_d&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_b&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_InvestmentProperty
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_NumberOfSharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of other comprehensive income that will be reclassified to profit or loss, before tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph IG6 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_IG6&doctype=Implementation%20Guidance -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 82A -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_82A&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_AdvancesForFutureCapital
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_CancellationOfNominativeCommonShares
Namespace Prefix: | sid_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | sid_CapitalIncreased
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- References No definition available. + Details
Name: | sid_NetEquity
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | sid_NumberOfValueIssued
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | sid_PricePerShare
Namespace Prefix: | sid_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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

X
- References No definition available. + Details
Name: | sid_ReverseImpairmentOfFairValue
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

X
- References No definition available. + Details
Name: | sid_ShareCapital
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | sid_StakePercentage
Namespace Prefix: | sid_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_TransactionCosts
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | sid_ValueOnClosingOfTransaction
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ifrs-full_InvestmentPropertyMember
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_CategoriesOfRelatedPartiesAxis=sid_CSNMineracaoSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sid_CompanhiaEstadualDeGeracaodeEnergiaEletricaCEEEGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sid_CSNCimentosBrasilSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sid_ItaEnergeticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=sid_IndirectInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInterestRatesAxis=sid_DirectInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sid_ConsorcioDaUsinaHidreletricaDeItaubaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sid_ConsorcioDaUsinaHidreletricaDePassoRealMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sid_PanatlanticaSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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