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SUBSEQUENT EVENTS (Details)
shares in Millions, T in Millions, $ in Millions
 59 Months Ended
Mar. 30, 2025
R$ / shares
shares
Mar. 30, 2023
USD ($)
R$ / shares
shares
Feb. 14, 2023
USD ($)
T
Dec. 31, 2027
USD ($)
New Asset Production        
Disclosure of non-adjusting events after reporting period [line items]        
Expected capital investment | $     $ 2,200.0  
Capacity of steel (in tons) | T     2.6  
Capacity of iron (in tons) | T     2.1  
Cumulative payments for development project expenditure | $       $ 2,900.0
Period of capital expenditures recognition     4 years  
Major ordinary share transactions | Usiminas        
Disclosure of non-adjusting events after reporting period [line items]        
Business acquisition, share price | R$ / shares R$ 10      
Percent of board approval   0.55    
Share price trading day window average 40 days      
Major ordinary share transactions | Usiminas | Ternium S.A.        
Disclosure of non-adjusting events after reporting period [line items]        
Cash transferred | $   $ 111.0    
Proportion of voting rights held in subsidiary   51.50%    
Percentage of share capital issued and outstanding   0.251    
Major ordinary share transactions | Usiminas | T/T Group        
Disclosure of non-adjusting events after reporting period [line items]        
Proportion of voting rights held in subsidiary   61.30%    
Major ordinary share transactions | Usiminas | NSC Group        
Disclosure of non-adjusting events after reporting period [line items]        
Proportion of voting rights held in subsidiary   31.70%    
Major ordinary share transactions | Usiminas | Previdencia Usiminas        
Disclosure of non-adjusting events after reporting period [line items]        
Proportion of voting rights held in subsidiary   7.10%    
Major ordinary share transactions | Ordinary shares | Usiminas        
Disclosure of non-adjusting events after reporting period [line items]        
Number of shares outstanding (shares) | shares 153.1      
Business acquisition, share price | R$ / shares   $ 10    
Major ordinary share transactions | Ordinary shares | Usiminas | Usiminas Control Group        
Disclosure of non-adjusting events after reporting period [line items]        
Number of shares outstanding (shares) | shares   68.7    
Major ordinary share transactions | Ordinary shares | Usiminas | Ternium S.A.        
Disclosure of non-adjusting events after reporting period [line items]        
Number of shares outstanding (shares) | shares   57.7