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BASIS OF CONSOLIDATION AND INVESTMENTS (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Oct. 21, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 27, 2024
Nov. 05, 2024
Aug. 31, 2024
May 09, 2024
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]                    
Cancellation of shares description   On February 21, 2024, the EGM took place, WHICH resolved on the compulsory redemption and subsequent cancellation of 98,375 (ninety-eight thousand, three hundred and seventy-five shares), being 41,896 (forty-one thousand, eight hundred and ninety-six) common shares and 56,479 (fifty-six thousand, four hundred and seventy-nine) preferred shares issued by CEEE-G, without modification of the Company's share capital.                
Net equity               R$ 2,383,276    
Capital reserve   R$ 2,056,970 R$ 32,720              
Number of stakeholders shares   5,485,338,835                
Percentage of shareholdings   100.00%                
Investment property   R$ 202,040 202,040           R$ 205,954 R$ 205,954
Investment property [member]                    
IfrsStatementLineItems [Line Items]                    
Investment property   R$ 2,431,581 R$ 2,235,614              
Direct Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   37.49%                
CSN Cimentos Brasil SA [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   99.99% 99.99%              
Net equity   R$ 2,383,276                
Share capital   2,300,489                
Capital reserve   R$ 82,786                
CSN Mineracao [Member]                    
IfrsStatementLineItems [Line Items]                    
Profit reserve amount           R$ 160,000 R$ 1,025,040      
Profit reserve per share           R$ 0.02943266927 R$ 0.186869166032      
Dividends reserve amount           R$ 2,375,000        
Dividends per share           R$ 0.43689118448        
Payment of interest on equity       R$ 211,610   R$ 465,000        
Payment of interest on equity per share       R$ 0.03895595758   R$ 0.08553869507        
Sale of common shares         589,304,801          
Sale of common stock price per share         R$ 7.50          
Sale of common shares value         R$ 4,419,786          
CSN Mineracao SA [Member]                    
IfrsStatementLineItems [Line Items]                    
Stake percentage   69.01% 79.75%              
Companhia Estadua lDe Geracaode Energia Eletrica CEEEG [Member]                    
IfrsStatementLineItems [Line Items]                    
Stake percentage 66.23%                  
CSN Cimentos Brasil SA [Member]                    
IfrsStatementLineItems [Line Items]                    
Stake percentage   99.99%                
Panatlantica S A [Member]                    
IfrsStatementLineItems [Line Items]                    
Equity method percentage   18.61%                
Equity acquisition value   R$ 150,000                
Interest in subsidiary   29.92% 11.31%              
Arvedi Metalfer Do Brasil S A [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   20.00% 20.00%              
Companhia Sidurgica Nacional [Member]                    
IfrsStatementLineItems [Line Items]                    
Number of stakeholders shares   3,785,474,692                
Percentage of shareholdings   69.01%                
Itochu Corporation [Member]                    
IfrsStatementLineItems [Line Items]                    
Number of stakeholders shares   589,304,801                
Percentage of shareholdings   10.74%                
Japao Brasil Minerio De Ferro Participacoes Ltda [Member]                    
IfrsStatementLineItems [Line Items]                    
Number of stakeholders shares   507,762,966                
Percentage of shareholdings   9.26%                
MRS Logistica SA [Member] | Indirect Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   18.75%                
MRS Logistica SA [Member] | Direct Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   18.74%                
Indirect Interest [Member] | Indirect Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   12.93%                
CSN Mineracao [Member] | Direct Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   18.75%                
Consorcio Da Usina Hidreletrica De Igarapava [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   17.92%                
Consorcio Da Usina Hidreletrica De Itauba [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   100.00%                
Consorcio Da Usina Hidreletrica De Itauba [Member] | Indirect Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   63.40%                
Consorcio Da Usina Hidreletrica De Itauba [Member] | Direct Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   36.60%                
Consorcio Da Usina Hidreletrica De Passo Real [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   100.00%                
Consorcio Da Usina Hidreletrica De Passo Real [Member] | Indirect Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   53.03%                
Consorcio Da Usina Hidreletrica De Passo Real [Member] | Direct Interest [Member]                    
IfrsStatementLineItems [Line Items]                    
Interest in subsidiary   46.97%