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ACQUISITION OF BUSINESS – INCREASE OF THE PARTICIPATION IN USIMINAS CONTROL GROUP AND NEW GOVERNANCE STRUCTURE OF USIMINAS - Narrative (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 12 Months Ended
Jul. 03, 2023
USD ($)
d
officer
$ / shares
shares
Jul. 02, 2023
Jun. 30, 2023
member
group
vicePresident
shares
Mar. 30, 2023
R$ / shares
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jul. 03, 2023
R$ / shares
Jul. 19, 2016
shares
Apr. 20, 2016
shares
Oct. 30, 2014
shares
Jan. 16, 2012
shares
Disclosure of detailed information about business combination [line items]                        
Proportion of control group shares required for decision 0.55                      
Quoted price (in BRL per share) | R$ / shares               R$ 7.36        
Financial liabilities | $         $ 4,767,651 $ 5,043,160            
Non-controlling interest | $         4,163,383 4,393,264            
Written put options                        
Disclosure of detailed information about business combination [line items]                        
Financial liabilities | $ $ 242,500       263,200              
T/T Group                        
Disclosure of detailed information about business combination [line items]                        
Number of other board officers | officer 4                      
Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Number of shares acquired through business combination (in shares) 57.7                      
Cash transferred | $ $ 118,686                      
Remeasurement of previously held interest in Usiminas | $ 385,851                      
Loss on the remeasurement of previously held interest in Usiminas | $ 441,410                      
Bargain purchase gain | $ 270,365                      
Effect related to the increase of the participation in Usiminas | $ 171,045       $ 0 171,045 $ 0          
Other comprehensive loss that will be reclassified to profit or loss, before tax | $ 934,900                      
Non-controlling interest | $ $ 2,575,900                      
Usiminas | NSC Group                        
Disclosure of detailed information about business combination [line items]                        
Number of executive board members | member     3                  
Nomination right for chief executive officer, alternation term     4 years                  
Nomination right for board of directors, alternation term     4 years                  
Usiminas | T/T Group | Put And Call Option                        
Disclosure of detailed information about business combination [line items]                        
Trading average price period | d 40                      
Derivative financial assets, share price (in BRL per share) | $ / shares $ 2.0584                      
Usiminas | Ternium                        
Disclosure of detailed information about business combination [line items]                        
Number of executive board members | member     3                  
Nomination right for chief executive officer, alternation term     4 years                  
Nomination right for board of directors, alternation term     4 years                  
Usiminas | Ordinary shares                        
Disclosure of detailed information about business combination [line items]                        
Number of shares to be acquired as per share purchase agreement (in shares)       68.7                
Price per share as per share purchase agreement (in BRL per share) | R$ / shares       R$ 10                
Ternium Investments | Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Number of shares acquired through business combination (in shares)                       84.7
Ternium Argentina S.A. | Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Number of shares acquired through business combination (in shares)                       30.0
Confab Industrial S.A. | Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Number of shares acquired through business combination (in shares)                       25.0
Ternium Investments S.à r.l. | Usiminas | Ordinary shares                        
Disclosure of detailed information about business combination [line items]                        
Number of shares acquired through business combination (in shares)                 62.6   51.4  
Ternium Investments S.à r.l. | Usiminas | Preferred shares                        
Disclosure of detailed information about business combination [line items]                        
Number of shares acquired through business combination (in shares)                   7.0    
Ternium Investments S.a.r.l. And Prosid | Usiminas | Ordinary shares                        
Disclosure of detailed information about business combination [line items]                        
Number of shares acquired through business combination (in shares)                 13.8      
Ternium Investments S.a.r.l. And Prosid | Usiminas | Preferred shares                        
Disclosure of detailed information about business combination [line items]                        
Number of shares acquired through business combination (in shares)                   1.5    
Ternium | Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in associate (percent)   20.40%                    
Ternium | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held     0.395                  
Ternium | Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Proportion of ownership interest in associate (percent)     20.40%                  
Effect related to the increase of the participation in Usiminas | $           $ 171,045            
Ternium | Usiminas | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held 0.515                      
Ternium | Usiminas | Ordinary shares                        
Disclosure of detailed information about business combination [line items]                        
Number of shares held     242.6                  
Proportion of shares held     0.344                  
Ternium | Usiminas | Preferred shares                        
Disclosure of detailed information about business combination [line items]                        
Number of shares held     8.5                  
Proportion of shares held     0.016                  
Usiminas Control Group | Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Number of shares held     483.6                  
Usiminas Control Group | Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Proportion of voting rights held in associate     68.60%                  
The T/T Group, The NSC Group, And Previdência Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Number of sub groups | group     3                  
T/T Group | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held     0.471                  
T/T Group | Usiminas | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held 0.613                      
TenarisConfab | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held     0.076                  
NSC Group | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held     0.459                  
NSC Group | Usiminas | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held 0.317                      
NSC Group | Usiminas | T/T Group | Put And Call Option                        
Disclosure of detailed information about business combination [line items]                        
Number of shares held 153.1                      
Previdência Usiminas | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held     0.07                  
Previdência Usiminas | Usiminas | Usiminas Control Group                        
Disclosure of detailed information about business combination [line items]                        
Proportion of shares held 0.071                      
Usiminas | Usiminas                        
Disclosure of detailed information about business combination [line items]                        
Number of executive board members | member     6                  
Number of vice-presidents | vicePresident     5