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BUSINESS COMBINATION (Details 13)
 12 Months Ended
Dec. 31, 2022
shares
Elizabeth Cimentos [Member]  
IfrsStatementLineItems [Line Items]  
Purchase price considered for the business combination 599,891
Elizabeth Mineracao [Member]  
IfrsStatementLineItems [Line Items]  
Purchase price considered for the business combination 118,831
Assets Transferred [Member] | Elizabeth Cimentos And Elizabeth Mineracao [Member]  
IfrsStatementLineItems [Line Items]  
Determination of comment A payment in the amount of R$201 milion is being carried out in the transaction.
Assets Transferred [Member] | Elizabeth Cimentos [Member]  
IfrsStatementLineItems [Line Items]  
Purchase price considered for the business combination 77,768 [1]
Assets Transferred [Member] | Elizabeth Mineracao [Member]  
IfrsStatementLineItems [Line Items]  
Purchase price considered for the business combination 123,947 [1]
Assets Transferred 1 [Member] | Elizabeth Cimentos And Elizabeth Mineracao [Member]  
IfrsStatementLineItems [Line Items]  
Determination of comment Refers to financial adjustment of working capital and debt
Assets Transferred 1 [Member] | Elizabeth Cimentos [Member]  
IfrsStatementLineItems [Line Items]  
Purchase price considered for the business combination (3,914) [1]
Assets Transferred 1 [Member] | Elizabeth Mineracao [Member]  
IfrsStatementLineItems [Line Items]  
Purchase price considered for the business combination (5,116) [1]
Equity Interests Issued [Member] | Elizabeth Cimentos And Elizabeth Mineracao [Member]  
IfrsStatementLineItems [Line Items]  
Determination of comment Shares issued by Elizabeth Cimentos and acquired by CSN Cimentos.
Equity Interests Issued [Member] | Elizabeth Cimentos [Member]  
IfrsStatementLineItems [Line Items]  
Purchase price considered for the business combination 526,037 [2]
[1] The transaction included payments by CSN Cimentos of R$77,768 and R$123,947 on August 31, 2021, and an adjustment in the amount of R$3,914 and R$5,116, received in December 2021 related to working capital adjustment provided for in the sale agreement.
[2] In August 2021, Elizabeth Cimentos performed a primary issuance of 2,382,758,512 new common shares, nominative and with no par value, which were subscribed and paid in by CSN Cimentos.