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v3.21.1

6. TRADE RECEIVABLES (Details 1) - Third parties [member] - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivable, before allowance for doubtful debts | R$ 2,974,524 | R$ 2,122,537
Current [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivable, before allowance for doubtful debts | 2,537,567 | 1,739,746
Past-due up to 30 days [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivable, before allowance for doubtful debts | 222,972 | 132,845
Past-due up to 180 days [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivable, before allowance for doubtful debts | 17,915 | 23,877
Past-due over 180 days [member] |  |
TradeAndOtherReceivablesLineItems [Line Items] |  |
Trade receivable, before allowance for doubtful debts | R$ 196,070 | R$ 226,069

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- Definition The amount of gross trade receivable. + References No definition available. + Details
Name: | sid_GrossTradeReceivable
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_CurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_PastDueStatusAxis=sid_NotLaterThanOneMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanThreeMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |