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28 INSURANCE (Details Narrative) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 BRL (R$)
Insurance [Abstract] |
Amount of insured assets | R$ 600
Description of insured assets | The maximum limit of indemnity is US$600 million and deductibles in the amount of US$385 million for material damages.

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- Definition Amount refers to the insured asstes. + References No definition available. + Details
Name: | sid_AmountOfInsuredAssets
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Information by description of insured assets. + References No definition available. + Details
Name: | sid_DescriptionOfInsuredAssets
Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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