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BASIS OF CONSOLIDATION AND INVESTMENTS (Details 4) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2021
Feb. 17, 2021
Dec. 31, 2022
Basis Of Consolidation And Investments      
Equity in the transaction     9,947,525
Number of share before initial public offering     5,430,057,060
Cost per share     R$ 1.83
Number of shares sold by CSN 377,804,907 372,749,743 377,804,907
Price per share     R$ 8.50
Net cash generated in the transaction     R$ 3,211,342
Transaction cost     (46,730)
Net cahs reveivable     3,164,612
Cost of shares     (692,115)
Net gain from the transaction     R$ 2,472,497