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DESCRIPTION OF BUSINESS (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Dec. 22, 2022
Nov. 24, 2022
Oct. 07, 2022
Jul. 31, 2022
IfrsStatementLineItems [Line Items]            
Description of production process As a pioneer in the use of technologies that result in the possibility of stacking the tailings generated in the iron ore production process, CSN Mineração has had its iron ore production, since January 2020, 100% independent of tailings dams. After significant investments in recent years to increase the level of reliability, decharacterization and dry stacking, CSN Mineração has moved towards a scenario in which 100% of its waste goes through a dry filtration process and is arranged in geotechnically controlled piles, in areas exclusively intended for stacking.          
Increase in capital   R$ 2,383,276        
Percentage of sale           100.00%
Shares issued           6,381,908
Percentage of equivalent           66.23%
Number of common shares issued       1,271    
Number of preferred shares issued       338    
Companhia Florestal do Brasil [member]            
IfrsStatementLineItems [Line Items]            
Percentage of interest     99.00%      
Companhia Energetica Chapeco [Member]            
IfrsStatementLineItems [Line Items]            
Percentage of interest         100.00%