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BUSINESS COMBINATION (Details 4) - BRL (R$)
R$ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2022
Santa Ana Energetica [Member]    
IfrsStatementLineItems [Line Items]    
Purchase price considered for the business combination   37,292
Topazio Energetica [Member]    
IfrsStatementLineItems [Line Items]    
Purchase price considered for the business combination   428,861
C S N Cimentos [Member]    
IfrsStatementLineItems [Line Items]    
Transaction amount R$ 466,153  
C S N Energia [Member]    
IfrsStatementLineItems [Line Items]    
Transaction amount R$ 466,153  
Assets Transferred [Member] | Santa Ana Energetica [Member]    
IfrsStatementLineItems [Line Items]    
Purchase price considered for the business combination [1]   37,292
Assets Transferred [Member] | Topazio Energetica [Member]    
IfrsStatementLineItems [Line Items]    
Purchase price considered for the business combination [1]   428,861
[1] On June 30, 2022, the transaction was concluded with the payment by CSN Cimentos and CSN Energia in the amount of R$466,153.