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32. INSURANCE (Details Narrative) - Operational risk insurance policy [member] - USD $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
Disclosure of types of insurance contracts [line items] |
Deductible material damages | $ 385,000
Days for loss of profits | 45
Top of range [member] |
Disclosure of types of insurance contracts [line items] |
Indemnity Limit | $ 600,000

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- 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_DisclosureOfTypesOfInsuranceContractsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of days for los of profits. + References No definition available. + Details
Name: | sid_DaysForLosOfProfits
Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represent information about the deductible material damages. + References No definition available. + Details
Name: | sid_DeductibleMaterialDamages
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent information about the indemnity limit. + References No definition available. + Details
Name: | sid_IndemnityLimit
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_DisaggregationOfInsuranceContractsAxis=ifrs-full_InsuranceContractsIssuedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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