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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
member
vice-president
$ / shares
MW
shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2022
R$ / shares
Jun. 30, 2022
Dec. 31, 2021
R$ / shares
Aug. 05, 2021
USD ($)
Dec. 31, 2019
USD ($)
Feb. 28, 2019
Disclosure of unconsolidated structured entities [line items]                  
Investments in associates $ 725,700 $ 681,700              
Revenue 16,414,466 16,090,744 $ 8,735,435            
Net sales 16,414,466 16,090,744 8,735,435            
Non-current assets 8,647,510 8,491,363              
Current assets 8,844,038 8,606,544              
Non-current liabilities 1,506,325 1,649,105              
Current liabilities 2,216,830 3,213,764              
Usiminas' shareholders' equity 13,768,393 12,235,038 $ 8,443,153         $ 7,714,873  
Borrowings 1,031,865 1,479,038              
Non-consolidated parties                  
Disclosure of unconsolidated structured entities [line items]                  
Investments in associates 356,200 653,900              
Techgen S.A. de C.V. Syndicated Loan Due February 2026 | Ternium Investments                  
Disclosure of unconsolidated structured entities [line items]                  
Payment for purchase of participation in borrowing arrangement             $ 68,000    
Usinas Siderurgicas de Minas Gerais S.A. - USIMINAS                  
Disclosure of unconsolidated structured entities [line items]                  
Revenue 6,297,000 6,270,000              
Net sales 6,297,000 6,270,000              
Usiminas' shareholders' equity $ 4,437,784 3,897,000              
Usinas Siderurgicas de Minas Gerais S.A. - USIMINAS | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C.                  
Disclosure of unconsolidated structured entities [line items]                  
Percentage of voting equity interests acquired 20.40%                
Usiminas Control Group                  
Disclosure of unconsolidated structured entities [line items]                  
Percentage of voting equity interests acquired 68.60%                
Number of executive board members | member 6                
Number of vice-presidents | vice-president 5                
Usiminas Control Group | Ternium Investments and NSC Group                  
Disclosure of unconsolidated structured entities [line items]                  
Length between electing chief executive officer 4 years                
Usiminas Control Group | Ternium Investments                  
Disclosure of unconsolidated structured entities [line items]                  
Number of board members to elect | member 3                
Usiminas Control Group | NSC Group                  
Disclosure of unconsolidated structured entities [line items]                  
Number of board members to elect | member 3                
Usiminas Control Group | T/T Group                  
Disclosure of unconsolidated structured entities [line items]                  
Percentage of voting equity interests acquired 47.10%                
Usiminas Control Group | Ternium S.A.                  
Disclosure of unconsolidated structured entities [line items]                  
Percentage of voting equity interests acquired 39.50%                
Usiminas Control Group | TenarisConfab                  
Disclosure of unconsolidated structured entities [line items]                  
Percentage of voting equity interests acquired 7.60%                
Usiminas Control Group | NSC Group                  
Disclosure of unconsolidated structured entities [line items]                  
Percentage of voting equity interests acquired 45.90%                
Usiminas Control Group | Previdencia Usiminas                  
Disclosure of unconsolidated structured entities [line items]                  
Percentage of voting equity interests acquired 7.00%                
Techgen S.A. de C.V.                  
Disclosure of unconsolidated structured entities [line items]                  
Revenue $ 580,000 419,000              
Number of megawatts (MW) | MW 900                
Net sales $ 580,000 419,000              
Profit (loss) from continuing operations 55,000 45,000              
Non-current assets 766,000 791,000              
Current assets 131,000 91,000              
Non-current liabilities 527,000 614,000              
Current liabilities 181,000 134,000              
Usiminas' shareholders' equity 189,000 $ 134,000              
Subordinated liabilities $ 126,800                
Techgen S.A. de C.V. | Ternium S.A.                  
Disclosure of unconsolidated structured entities [line items]                  
Proportion of ownership interest in associate (percent) 48.00%                
Proportion of ownership interest in associate's power supply (percent) 78.00%                
Techgen S.A. de C.V. | Tecpetrol International S.A.                  
Disclosure of unconsolidated structured entities [line items]                  
Proportion of ownership interest in associate (percent) 30.00%                
Techgen S.A. de C.V. | Ternium Investments S.à.r.l.                  
Disclosure of unconsolidated structured entities [line items]                  
Proportion of ownership interest in associate (percent) 22.00%                
Proportion of ownership interest in associate's power supply (percent) 22.00%                
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | Techgen S.A. de C.V. Syndicated Loan Due February 2026                  
Disclosure of unconsolidated structured entities [line items]                  
Borrowings $ 344,000                
Debt instrument, average life         4 years 3 months 18 days        
Debt instrument, percentage of debt service reserve account         10.00%        
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | Techgen S.A. de C.V. Syndicated Loan Due February 2026 | Ternium Investments                  
Disclosure of unconsolidated structured entities [line items]                  
Payment for purchase of participation in borrowing arrangement $ 51,000                
Techgen S.A. de C.V. | HSBC Mexico, Natixis, Credit Agricole, BNP, Santander, Intesa SP and Norinchukin | London Interbank Offered Rate (LIBOR)1 | Techgen S.A. de C.V. Syndicated Loan Due February 2026                  
Disclosure of unconsolidated structured entities [line items]                  
Borrowings, adjustment to interest rate basis                 1.70%
Ordinary shares                  
Disclosure of unconsolidated structured entities [line items]                  
Share price (per share) | (per share) $ 1.42 $ 2.60   R$ 7.41   R$ 14.51      
Ordinary shares | Usinas Siderurgicas de Minas Gerais S.A. - USIMINAS | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C.                  
Disclosure of unconsolidated structured entities [line items]                  
Number of shares outstanding (shares) | shares 242.6                
Ordinary shares | Usiminas Control Group                  
Disclosure of unconsolidated structured entities [line items]                  
Number of shares outstanding (shares) | shares 483.6                
Preferred shares                  
Disclosure of unconsolidated structured entities [line items]                  
Share price (per share) | (per share) $ 1.37 $ 2.72   R$ 7.16   R$ 15.16      
Preferred shares | Usinas Siderurgicas de Minas Gerais S.A. - USIMINAS | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C.                  
Disclosure of unconsolidated structured entities [line items]                  
Number of shares outstanding (shares) | shares 8.5