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RELATED-PARTY BALANCES AND TRANSACTIONS (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Borrowings R$ 19,856,047 R$ 16,505,166
Tax foreclosure 10,029 9,562
Others 537,525 402,796
Total 20,403,601 16,917,524
Guarantees [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 14,257,629 13,867,929
Others 401,370 396,780
Total 14,658,999 14,264,709
Local Currency [Member] | Guarantees [member]    
IfrsStatementLineItems [Line Items]    
Borrowings 5,598,418 2,637,237
Tax foreclosure 10,029 9,562
Others 136,155 6,016
Total R$ 5,744,602 2,652,815
Local Currency [Member] | Guarantees [member] | Transnordestina Logistica S A [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 09/19/2056 and Indefinite  
Borrowings R$ 3,695,183 2,096,291
Tax foreclosure 10,029 9,365
Others 4,235 3,853
Total R$ 3,709,447 2,109,509
Local Currency [Member] | Guarantees [member] | Controladas Do Grupo [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 12/21/2024 and indefinite  
Borrowings R$ 1,903,235  
Tax foreclosure   197
Others 131,920 2,163
Total R$ 2,035,155 2,360
Local Currency [Member] | Guarantees [member] | C S N Mineracao [Member]    
IfrsStatementLineItems [Line Items]    
Maturities Up to 12/21/2024  
Borrowings   540,946
Total   540,946
Foreign Currency [Member] | Guarantees [member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Borrowings R$ 2,945,000 2,565,000
Total 2,945,000 2,565,000
Foreign Currency [Member] | Guarantees [member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Others 75,000 75,000
Total R$ 75,000 75,000
Foreign Currency [Member] | Guarantees [member] | C S N Inova Ventures [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Maturities 01/28/2028  
Borrowings R$ 1,300,000 1,300,000
Total R$ 1,300,000 1,300,000
Foreign Currency [Member] | Guarantees [member] | C S N Resources [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Maturities Up to 04/17/2026  
Borrowings R$ 1,530,000 1,150,000
Total R$ 1,530,000 1,150,000
Foreign Currency [Member] | Guarantees [member] | C S N Cimentos [Member] | United States of America, Dollars    
IfrsStatementLineItems [Line Items]    
Maturities Indefinite  
Borrowings R$ 115,000 115,000
Total R$ 115,000 115,000
Foreign Currency [Member] | Guarantees [member] | Lusosider Acos Planos [Member] | Euro Member Countries, Euro    
IfrsStatementLineItems [Line Items]    
Maturities Indefinite  
Others R$ 75,000 75,000
Total R$ 75,000 R$ 75,000