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6. INVENTORIES (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Inventories [Abstract]
Opening balance	R$ (157,754)	R$ (135,840)
(Estimated losses) / Reversal of inventories with low turnover and obsolescence	23,201	(21,914)
Closing balance	R$ (134,553)	R$ (157,754)

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No definition available.

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Namespace Prefix:	sid_
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- Definition

The amount represents beginning balance of inventory.

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No definition available.

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Namespace Prefix:	sid_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The amount recognised as a reduction in the amount of inventories recognised as an expense due to the reversal low turnover and obsolescence.

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No definition available.

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