XML 132 R113.htm IDEA: XBRL DOCUMENT
v3.21.1

14. FINANCIAL INSTRUMENTS (Details 5) - Foreign exchange risk [member] R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 BRL (R$)
UNITED STATES [member] | Net exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | R$ 48,679 |
Risk | Dollar |
UNITED STATES [member] | Gross exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | R$ (3,876,521) |
Risk | Dollar |
UNITED STATES [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | R$ 3,992,200 |
Risk | Dollar |
Euro [member] | Net exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | R$ 10,138 |
Risk | Euro |
Probable scenario [member] | UNITED STATES [member] | Net exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | R$ 3,164 | [1]
Probable scenario [member] | UNITED STATES [member] | Gross exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | (251,974) | [1]
Probable scenario [member] | UNITED STATES [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 259,493 |
Probable scenario [member] | Euro [member] | Net exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 89 | [1]
Scenario 1 [member] | UNITED STATES [member] | Net exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 63,242 |
Scenario 1 [member] | UNITED STATES [member] | Gross exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | (5,036,279) |
Scenario 1 [member] | UNITED STATES [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 5,186,566 |
Scenario 1 [member] | Euro [member] | Net exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 16,165 |
Scenario 2 [member] | UNITED STATES [member] | Net exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 126,486 |
Scenario 2 [member] | UNITED STATES [member] | Gross exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | (10,072,558) |
Scenario 2 [member] | UNITED STATES [member] | Cash flow hedges [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 10,373,133 |
Scenario 2 [member] | Euro [member] | Net exchange position [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 32,330 |
Exchange rate swap dollar x euro [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | R$ 40,697 |
Risk | Dollar |
Exchange rate swap dollar x euro [member] | Probable scenario [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | R$ 5,264 | [1]
Exchange rate swap dollar x euro [member] | Scenario 1 [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 50,134 |
Exchange rate swap dollar x euro [member] | Scenario 2 [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | 78,337 |
Exchange rate swap CDI x dollar [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | R$ (67,000) |
Risk | Dollar |
Exchange rate swap CDI x dollar [member] | Probable scenario [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | R$ (4,355) | [1]
Exchange rate swap CDI x dollar [member] | Scenario 1 [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | (87,045) |
Exchange rate swap CDI x dollar [member] | Scenario 2 [member] | UNITED STATES [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Impact on profit or loss | R$ (174,089) |
[1] | The probable scenarios were calculated considering the following variations for risks: Real x Dollar - devaluation of the Real by 1.25% / Real x Euro - devaluation of the Real by 0.14% / Euro x Dollar - appreciation of Euro by 1.20%, Source: Central Bank of Brazil and European Central Bank quotations on 1/14/2021.

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 gains (losses) on the ineffective portion of cash flow hedges recognised in profit or loss. [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 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_24_b&doctype=Standard&book=b -URIDate 2020-01-01 + Details
Name: | ifrs-full_GainsLossesOnIneffectivenessOfCashFlowHedgesRecognisedInProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount refers to currency risk. + References No definition available. + Details
Name: | sid_CurrencyRisk
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: | srt_CurrencyAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfHedgesAxis=sid_NetExchangePositionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_TypesOfHedgesAxis=sid_NetExchangePositionOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProbabilityOfDefaultAxis=sid_ProbableScenarioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProbabilityOfDefaultAxis=sid_ScenarioIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ProbabilityOfDefaultAxis=sid_ScenarioIIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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