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24. Shareholders' Compensation (Details Narrative)	12 Months Ended
	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