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24. Shareholders' Compensation (Details Narrative) | 12 Months Ended
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Dec. 31, 2020
Shareholders Compensation |
Percentage of distribution of minimum dividends | 25.00%

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- Definition Represent information about the percentage of distribution of minimum dividends. + References No definition available. + Details
Name: | sid_PercentageOfDistributionOfMinimumDividends
Namespace Prefix: | sid_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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