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EMPLOYEE BENEFITS (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Number of shares held 3,486,252 3,486,252
Plan assets value R$ 6,400,000 R$ 5,900,000
Actuarial assumption of expected rates of salary increases 1.00% 1.00%
Description of investment policy The investment plan is reviewed annually and approved by the Deliberative Council, considering a 5-year horizon, as established in CGPC resolution No. 7 of December 4, 2003. The investment limits and criteria established in the policy are based on Resolution 4,661/18, published by the National Monetary Council (“CMN”).  
Pension plan expense R$ 1,587 R$ 1,616
Defined Benefit Plan [Member]    
IfrsStatementLineItems [Line Items]    
Description of pension fund market In compliance with current legislation, specific to the pension fund market, for the last 4 years ended (2020, 2021, 2022 and 2023), there was no need to pay installments by CSN, since the benefit plans presented actuarial gains in the year.  
Average Salary Supplementation Plan [Member]    
IfrsStatementLineItems [Line Items]    
Actuarial assumption of expected rates of salary increases 35.00%  
Participants salary term 12 months  
Plan Covering Thirty Five Percent Of The Average Salary [Member]    
IfrsStatementLineItems [Line Items]    
Participants salary term 12 months  
Mixed Supplementary Benefit Plan [Member] | Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Estimate of contributions expected to be paid to plan for next annual reporting period R$ 22,032  
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan by plan participants R$ 1,332