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32. INSURANCE (Details Narrative) - Operational risk insurance policy [member] - USD $ in Thousands	12 Months Ended
	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

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- Definition

The amount of days for los of profits.

+ References

No definition available.

+ Details

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- Definition

Represent information about the deductible material damages.

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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- Details

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X

- Details

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