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30. EMPLOYEE BENEFITS (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]    
Number of common shares held 4,450,652 1,870,652
Total guarantee resources R$ 5,700,000 R$ 5,500,000
Percentage of average salary 4.35% 4.65%
Pension plan expense R$ 41,050 R$ 40,644
Description of investment policy The investment plan is reviewed annually and approved by the Deliberative Council, considering a 5-year horizon, as established by 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”).  
Defined benefit plan [member]    
Disclosure of defined benefit plans [line items]    
Description of pension fund market In compliance with current legislation, specific to the pension fund market, for the last 4 years ended (2017, 2018, 2019 and 2020), there was no need to pay installments by CSN, since the benefit plans defined actuarial gains in the year.  
Plan covering 35% Of The Average Salary [member]    
Disclosure of defined benefit plans [line items]    
Percentage of average salary 35.00%  
Participant's salary term 12 months  
Average Salary Supplementation Plan [member]    
Disclosure of defined benefit plans [line items]    
Percentage of average salary 35.00%  
Participant's salary term 12 months  
Mixed Supplementary Benefit Plan [member] | 2021 [member]    
Disclosure of defined benefit plans [line items]    
Contributions forecast to be paid 2020 R$ 21,563  
Contributions amount R$ 1,322