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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
Dec. 30, 2019
MMBTU
Mar. 05, 2019
USD ($)
payment
May 09, 2018
MMBTU
Apr. 24, 2017
MW
Jun. 30, 2008
USD ($)
m³
Jan. 31, 2023
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2017
Dec. 31, 2022
USD ($)
stand-byLetterOfCredit
t
m³
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2006
distributor
MW
Dec. 13, 2019
payment
Feb. 13, 2019
USD ($)
Jun. 30, 2018
USD ($)
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                 $ 62,000,000            
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            
Long-term purchase commitment, obligations outstanding                 17,000,000            
Gas Industrial de Monterrey, S.A. de C.V. | Guarantee Letter Contract                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, amount           $ 28,800,000                  
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            
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            
Kinder Morgan Gas                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, obligations outstanding                 $ 193,200,000            
24 Distributos (CCEAR)                              
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                 $ 4,500,000            
Unicarbo Ltda.                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, amount                 40,900,000            
Public utilities inventory, fuel | Air Liquide Argentina S.A.                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, amount                 72,500,000            
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                 $ 190,000,000            
Iron Ore, Pellets and Iron Ore Fines | ValeS.A.MineracaoCorumbaenseReunidaS.A.                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, minimum percentage of volume required                 80.00%            
Long-term purchase commitment, amount                 $ 688,800,000            
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                 $ 192,100,000            
Maintenance Services | Primetals Technologies Brazil Ltda.                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, amount                 38,900,000            
Natural Gas | Tecpetrol                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, amount                 62,500,000            
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                 13,400,000            
Natural Gas | Companhia Distribuidora de Gás do Rio de Janeiro                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, amount                 $ 39,400,000            
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                 $ 92,800,000            
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            
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee                              
Disclosure of contingent liabilities [line items]                              
Guarantor obligations, outstanding                 $ 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 | stand-byLetterOfCredit                 2            
Guarantor obligations, percentage                 48.00%            
Scenario one | ValeS.A.MineracaoCorumbaenseReunidaS.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 | ValeS.A.MineracaoCorumbaenseReunidaS.A.                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, percentage of total volume actually operated                 70.00%            
Scenario one | Top of range | ValeS.A.MineracaoCorumbaenseReunidaS.A.                              
Disclosure of contingent liabilities [line items]                              
Long-term purchase commitment, percentage of total volume actually operated                 75.00%            
Scenario two | ValeS.A.MineracaoCorumbaenseReunidaS.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 | ValeS.A.MineracaoCorumbaenseReunidaS.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
Number of loan payments | payment                         8    
Borrowings, net senior leverage ratio                 350.00%            
Line of credit facility, disbursed             $ 600,000,000       $ 400,000,000        
Borrowings outstanding                 $ 125,000,000            
Ternium Investments Syndicated Loan                              
Disclosure of contingent liabilities [line items]                              
Original principal amount   $ 1,500,000,000                          
Number of loan payments | payment   8                          
Repayments of non-current borrowings                   $ 725,000,000 $ 375,000,000        
Ternium Investments Syndicated Loan | Ternium Investments S.à.r.l.                              
Disclosure of contingent liabilities [line items]                              
Debt instrument, term   5 years