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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Commitments) (Details)
MMBTU in Thousands, t in Millions, m³ in Millions
 1 Months Ended 12 Months Ended 13 Months Ended
Dec. 31, 2021
USD ($)
MW
Dec. 30, 2019
MMBTU
Mar. 05, 2019
USD ($)
payment
May 09, 2018
MMBTU
Apr. 24, 2017
MW
Jun. 30, 2008
USD ($)
m³
Mar. 31, 2008
electrical_plant
Dec. 20, 2000
electrical_plant
Mar. 31, 2017
Dec. 31, 2021
USD ($)
t
MW
m³
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2006
distributor
MW
Jun. 30, 2019
USD ($)
Dec. 13, 2019
payment
Feb. 13, 2019
USD ($)
Jun. 30, 2018
USD ($)
Disclosure of contingent liabilities [line items]                                  
Number of electrical plants terminated | electrical_plant             2                    
Techgen S.A. de C.V.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term contract for purchase of electric power, term         25 years                        
Long-term contract for purchase of electric power, electrical demand | MW         699                        
Percentage of electricity needs supplied         78.00%                        
Guarantor obligations, outstanding $ 61,800,000                 $ 61,800,000              
Iberdrola Energia Monterey, S.A. de C.V.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term contract for purchase of electric power, term               25 years                  
Long-term contract for purchase of electric power, electrical demand | MW 51.7                 111.2              
Percentage of electricity needs supplied                   7.00%              
Long-term contract for purchase of electric power, credit (per megawatt)                   $ 750,000              
Long-term contract for purchase of electric power, credit                   83,400,000              
Long-term contract for purchase of electric power, discount                   $ 15,000,000              
Short-term contract for purchase of electric power, percentage discount on contract                   2.50%              
Ternium Mexico S.A. de C.V.                                  
Disclosure of contingent liabilities [line items]                                  
Number of electrical plants | electrical_plant               4                  
Gas Industrial de Monterrey, S.A. de C.V.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount $ 17,000,000                                
Guarantor obligations, amount 16,600,000                 $ 16,600,000              
Long-term purchase commitment, obligations outstanding 11,500,000                 11,500,000              
Praxair Mexico | Minimum Annual Oxygen Consumption                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment , minimum annual consumption, amount           $ 4,500,000                      
Kinder Morgan Texas Pipeline L.L.C., Kinder Morgan Tejas Pipeline L.L.C. and Kinder Morgan Border Pipeline L.L.C.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term contract for purchase of natural gas transportation, period       10 years                          
Long-term contract for purchase of natural gas transportation, capacity | MMBTU       60                          
Long-term contract for purchase of natural gas transportation, amount 3,700,000                 3,700,000              
Kinder Morgan Texas Pipeline L.L.C., Kinder Morgan Tejas Pipeline L.L.C. and Kinder Morgan Gas Natural de México S. de R.L. de C.V.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term contract for purchase of natural gas transportation, period   15 years                              
Long-term contract for purchase of natural gas transportation, capacity | MMBTU   31                              
Long-term contract for purchase of natural gas transportation, amount 4,800,000                 4,800,000              
Kinder Morgan Gas                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, obligations outstanding 206,700,000                 $ 206,700,000              
Ternium Brasil Ltda.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term contract for purchase of electric power, term                         15 years        
Long-term contract for purchase of electric power, electrical demand | MW                         200        
Number of distributors | distributor                         24        
GE Global Parts and Products GMBH, General Electric International Inc. and Alstom Energia Térmica e Indústria Ltda.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, period for maintenance services of turbines                 20 years                
Companhia Distribuidora de Gás do Rio de Janeiro                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, minimum percentage of volume required                   85.00%              
LSI Logistica S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount 7,200,000                                
Public utilities inventory, fuel | Air Liquide Argentina S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                   $ 16,200,000              
Industrial Gas | Praxair Mexico                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount           $ 421,000,000                      
Long-term purchase commitment , minimum annual consumption, volume | m³           96.0                      
Industrial Gas | Air Liquide Brasil Ltda., AirSteel Ltda., White Martins Gases Industriais Ltda., White Martins Steel Ltda. and ThyssenKrupp MinEnergy GmbH                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount 202,000,000                                
Iron Ore, Pellets and Iron Ore Fines | Ternium Argentina S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, minimum percentage of volume required                   80.00%              
Long-term purchase commitment, amount                   $ 890,000,000              
Iron Ore, Pellets and Iron Ore Fines | Vale S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, total purchased volume | t                   8.0              
Turbine Maintenance | GE Global Parts and Products GMBH, General Electric International Inc. and Alstom Energia Térmica e Indústria Ltda.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                   $ 138,300,000              
Maintenance Services | Primetals Technologies Brazil Ltda.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                   44,700,000              
Natural Gas | Tecpetrol                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                   82,600,000              
Natural Gas | Transportadora de Gas del Norte S.A. and Energy Consulting Services S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                   20,600,000              
Natural Gas | Companhia Distribuidora de Gás do Rio de Janeiro                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                   $ 24,100,000              
Long-term purchase commitment, renewal period                   2 years              
Long-term purchase commitment, volume | m³                   61.3              
Ternium S.A. | Kinder Morgan Gas                                  
Disclosure of contingent liabilities [line items]                                  
Guarantor obligations, outstanding 99,200,000                 $ 99,200,000              
Guarantor obligations, percentage                   48.00%              
Techgen S.A. de C.V. | Syndicated Loan                                  
Disclosure of contingent liabilities [line items]                                  
Original principal amount                               $ 640,000,000  
Borrowings outstanding 46,800,000                 $ 46,800,000              
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee                                  
Disclosure of contingent liabilities [line items]                                  
Guarantor obligations, outstanding $ 22,400,000                 $ 22,400,000              
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee                                  
Disclosure of contingent liabilities [line items]                                  
Number of stand-by letters of credit 2                 2              
Guarantor obligations, percentage                   48.00%              
Scenario one | Ternium Argentina S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, minimum percentage of volume required                   80.00%              
Long-term purchase commitment, percentage of penalty                   7.00%              
Scenario one | Bottom of range | Ternium Argentina S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, percentage of total volume actually operated                   70.00%              
Scenario one | Top of range | Ternium Argentina S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, percentage of total volume actually operated                   75.00%              
Scenario two | Ternium Argentina S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, minimum percentage of volume required                   80.00%              
Long-term purchase commitment, percentage of penalty                   15.00%              
Scenario two | Bottom of range | Ternium Argentina S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, percentage of total volume actually operated                   70.00%              
Ternium Mexico Syndicated Loan Due June 2023                                  
Disclosure of contingent liabilities [line items]                                  
Original principal amount $ 1,000,000,000                 $ 1,000,000,000             $ 1,000,000,000
Number of loan payments | payment                             8    
Borrowings, net senior leverage ratio 350.00%                 350.00%              
Line of credit facility, disbursed                       $ 400,000,000   $ 600,000,000      
Borrowings outstanding $ 250,000,000                 $ 250,000,000              
Ternium Investments Syndicated Loan                                  
Disclosure of contingent liabilities [line items]                                  
Original principal amount     $ 1,500,000,000                            
Number of loan payments | payment     8                            
Borrowings outstanding $ 375,000,000                 $ 375,000,000              
Repayments of non-current borrowings                     $ 725,000,000 $ 375,000,000          
Ternium Investments Syndicated Loan | Ternium Investments S.a.r.l.                                  
Disclosure of contingent liabilities [line items]                                  
Debt instrument, term     5 years