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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Commitments) (Details)
m³ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
MW
May 25, 2018
USD ($)
Apr. 24, 2017
MW
Mar. 31, 2008
electrical_plant
Dec. 20, 2000
electrical_plant
Dec. 31, 2018
USD ($)
BTU
t
MW
m³
Dec. 31, 2006
distributor
MW
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of contingent liabilities [line items]                  
Number of electrical plants terminated | electrical_plant       2          
Borrowings $ 2,036,957,000         $ 2,036,957,000     $ 3,221,907,000
Dividend payables $ 2,900,000,000         $ 2,900,000,000      
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   $ 60,800,000              
Guarantor obligations, percentage of amount payable if counterparty terminates agreement   78.00%              
Ternium Mexico S.A. de C.V.                  
Disclosure of contingent liabilities [line items]                  
Number of electrical plants | electrical_plant         4        
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           25.00%      
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, length that rates are similar to previous term           7 months      
Short-term contract for purchase of electric power, percentage discount on contract           2.50%      
Gas Industrial de Monterrey, S.A. de C.V.                  
Disclosure of contingent liabilities [line items]                  
Guarantor obligations, borrowing outstanding $ 25,000,000         $ 25,000,000      
Guarantor obligations, current carrying value 16,700,000         16,700,000      
Kinder Morgan Gas                  
Disclosure of contingent liabilities [line items]                  
Guarantor obligations, borrowing outstanding 250,000,000         $ 250,000,000      
Long-term contract for purchase of natural gas transportation, capacity | BTU           150,000,000,000      
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, amount           $ 129,800,000      
Long-term purchase commitment, period for maintenance services of turbines           20 years      
Primetals Technologies Brazil Ltda.                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           $ 223,500,000      
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 343,300,000                
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%      
Long-term purchase commitment, amount           $ 33,900,000      
Long-term purchase commitment, volume | m³           61.3      
Stahllog Solucao Logisticas Ltda.                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount 26,800,000                
Public utilities inventory, fuel | Air Liquide Argentina S.A.                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           $ 21,900,000      
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           $ 764,000,000      
Iron Ore, Pellets and Iron Ore Fines | Vale S.A.                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, total purchased volume | t           8,000,000      
Freight Services                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, minimum quantity required (per month) | t           200,000      
Long-term purchase commitment, quantity required | t           1,200,000      
Freight Services | Ferrocarril Mexicano, S. A. de C. V.                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, period           5 years      
Long-term purchase commitment, period to make investments to improve loading and unloading of gondolas           36 months      
Ternium S.A. | Kinder Morgan Gas                  
Disclosure of contingent liabilities [line items]                  
Guarantor obligations, borrowing outstanding 120,000,000         $ 120,000,000      
Guarantor obligations, percentage           48.00%      
Techgen S.A. de C.V. | Syndicated Loan                  
Disclosure of contingent liabilities [line items]                  
Borrowings 800,000,000         $ 800,000,000      
Borrowings outstanding 600,000,000         600,000,000      
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee                  
Disclosure of contingent liabilities [line items]                  
Guarantor obligations, outstanding 288,000,000         $ 288,000,000      
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee                  
Disclosure of contingent liabilities [line items]                  
Threshold percentage, right to purchase energy           78.00%      
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%      
Forecast | Natural Gas | Ternium Argentina S.A.                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           $ 33,700,000      
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%      
Borrowings $ 400,000,000         $ 400,000,000