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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 6 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
MW
Dec. 30, 2019
MMBTU
Mar. 05, 2019
USD ($)
May 25, 2018
May 09, 2018
MMBTU
Apr. 24, 2017
MW
Jun. 30, 2008
USD ($)
m³
Mar. 31, 2008
electrical_plant
Dec. 20, 2000
electrical_plant
Mar. 31, 2017
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
t
MW
m³
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2006
distributor
MW
Feb. 13, 2019
USD ($)
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 $ 62,500,000                     $ 62,500,000          
Guarantor obligations, percentage of amount payable if counterparty terminates agreement       78.00%                          
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                       $ 15,000,000.0          
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 $ 25,000,000.0                                
Guarantor obligations, amount 25,000,000.0                     $ 25,000,000.0          
Long-term purchase commitment, obligations outstanding 9,500,000                     9,500,000          
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 221,800,000                     $ 221,800,000          
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 11,000,000.0                                
Public utilities inventory, fuel | Air Liquide Argentina S.A.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                       $ 18,700,000          
Industrial Gas | Praxair Mexico                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount 6,100,000           $ 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 228,900,000                                
Hydrogen | Praxair Mexico                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount 8,800,000                                
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                       $ 385,000,000.0          
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                       $ 171,300,000          
Maintenance Services | Primetals Technologies Brazil Ltda.                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                       57,300,000          
Natural Gas | Tecpetrol                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                       8,100,000          
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                       28,500,000          
Natural Gas | Companhia Distribuidora de Gás do Rio de Janeiro                                  
Disclosure of contingent liabilities [line items]                                  
Long-term purchase commitment, amount                       $ 25,800,000          
Long-term purchase commitment, volume | m³                       61.5          
Techgen S.A. de C.V. | Syndicated Loan                                  
Disclosure of contingent liabilities [line items]                                  
Original principal amount                               $ 640,000,000  
Borrowings outstanding 44,600,000                     $ 44,600,000          
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee                                  
Disclosure of contingent liabilities [line items]                                  
Guarantor obligations, outstanding 21,400,000                     21,400,000          
Ternium S.A. | Kinder Morgan Gas                                  
Disclosure of contingent liabilities [line items]                                  
Guarantor obligations, outstanding 106,500,000                     $ 106,500,000          
Guarantor obligations, percentage                       48.00%          
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee                                  
Disclosure of contingent liabilities [line items]                                  
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
Borrowings, net senior leverage ratio 350.00%                     350.00%          
Line of credit facility, disbursed                     $ 600,000,000     $ 400,000,000      
Borrowings outstanding $ 500,000,000                     $ 500,000,000          
Ternium Investments Syndicated Loan                                  
Disclosure of contingent liabilities [line items]                                  
Original principal amount     $ 1,500,000,000                            
Borrowings outstanding $ 400,000,000                     $ 400,000,000          
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