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RELATED-PARTY BALANCES AND TRANSACTIONS (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Borrowings R$ 27,905,234 R$ 19,856,047
Tax foreclosure 10,717 10,029
Others 489,471 537,525
Total 28,405,422 20,403,601
Guarantees [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 21,858,819 14,257,629
Others 482,723 401,370
Total 22,341,542 14,658,999
Local Currency [Member] | Guarantees [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 6,046,415 5,598,418
Tax foreclosure 10,717 10,029
Others 6,748 136,155
Total R$ 6,063,880 5,744,602
Local Currency [Member] | Guarantees [member] | Transnordestina Logistica S A [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 09/19/2056 and Indefinite  
Borrowings R$ 3,966,722 3,695,183
Tax foreclosure 10,717 10,029
Others 4,828 4,235
Total R$ 3,982,267 3,709,447
Local Currency [Member] | Guarantees [member] | Controladas Do Grupo [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 01/10/2028 and Indefinite  
Borrowings R$ 2,079,693 1,903,235
Others 1,920 131,920
Total 2,081,613 2,035,155
United States of America, Dollars | Guarantees [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 3,530,000 2,945,000
Total R$ 3,530,000 2,945,000
United States of America, Dollars | Guarantees [member] | CSN Inova Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Maturities 01/28/2028  
Borrowings R$ 1,300,000 1,300,000
Total R$ 1,300,000 1,300,000
United States of America, Dollars | Guarantees [member] | CSN Resources [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 04/08/2032  
Borrowings R$ 2,230,000 1,530,000
Total R$ 2,230,000 1,530,000
United States of America, Dollars | Guarantees [member] | CSN Cimentos [Member]    
IfrsStatementLineItems [Line Items]    
Maturities 06/10/2027  
Borrowings   115,000
Total   115,000
Euro Member Countries, Euro | Guarantees [member]    
IfrsStatementLineItems [Line Items]    
Others R$ 75,000 75,000
Total R$ 75,000 75,000
Euro Member Countries, Euro | Guarantees [member] | Lusosider Acos Planos [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Indefinite  
Others R$ 75,000 75,000
Total R$ 75,000 R$ 75,000