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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
member
vice-president
$ / shares
MW
shares
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2021
R$ / shares
Aug. 05, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
R$ / shares
Dec. 31, 2019
R$ / shares
Feb. 28, 2019
Dec. 31, 2018
USD ($)
Disclosure of unconsolidated structured entities [line items]                    
Investments in associates $ 681,700 $ 422,900                
Revenue 16,090,744 8,735,435 $ 10,192,818              
Net sales 16,090,744 8,735,435 10,192,818              
Non-current assets 8,491,363 8,289,460                
Current assets 8,606,544 4,566,775                
Non-current liabilities 1,649,105 2,559,485                
Current liabilities 3,213,764 1,853,597                
Equity 12,235,038 8,443,153 $ 7,714,873             $ 7,484,576
Borrowings 1,479,038 1,722,893                
Non-consolidated parties                    
Disclosure of unconsolidated structured entities [line items]                    
Investments in associates 653,900 756,300                
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 SIDEÚRGICAS DE MINAS GERAIS S.A.                    
Disclosure of unconsolidated structured entities [line items]                    
Revenue 6,270,000 3,133,000                
Net sales 6,270,000 3,133,000                
Equity $ 3,897,381 2,861,000                
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | 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 $ 419,000 314,000                
Number of megawatts (MW) | MW 900                  
Net sales $ 419,000 314,000                
Profit (loss) from continuing operations 45,000 44,000                
Non-current assets 791,000 833,000                
Current assets 91,000 59,000                
Non-current liabilities 614,000 709,000                
Current liabilities 134,000 95,000                
Equity 134,000 $ 89,000                
Subordinated liabilities $ 127,400                  
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.a.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 $ 423,000         $ 463,000        
Debt instrument, average life           2 years 7 months 24 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 $ 62,000                  
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) $ 2.60 $ 3.02   R$ 14.51     R$ 15.69      
Ordinary shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | 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)   $ 2.72 $ 2.81       R$ 15.16 R$ 14.61    
Preferred shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | 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