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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Commitments: a-l) (Details)
MMBTU in Thousands, m³ in Millions
 1 Months Ended 12 Months Ended
Dec. 30, 2019
MMBTU
May 09, 2018
MMBTU
Apr. 24, 2017
MW
Jun. 30, 2008
USD ($)
m³
Jun. 30, 2019
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2018
USD ($)
Dec. 13, 2019
payment
Jun. 30, 2018
USD ($)
Ternium Mexico Syndicated Loan Due June 2023                  
Disclosure of contingent liabilities [line items]                  
Original principal amount                 $ 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    
Property, plant and equipment                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           $ 175,500,000      
Wind Generation Farm                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           $ 62,000,000      
ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario one                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, percentage of penalty           7.00%      
Long-term purchase commitment, minimum percentage of volume required           80.00%      
ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario one | Bottom of range                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, percentage of total volume actually operated           70.00%      
ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario one | Top of range                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, percentage of total volume actually operated           75.00%      
ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario two                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, percentage of penalty           15.00%      
Long-term purchase commitment, minimum percentage of volume required           80.00%      
ValeS.A.MineracaoCorumbaenseReunidaS.A. | Scenario two | Bottom of range                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, percentage of total volume actually operated           70.00%      
Air Liquide Argentina S.A. | Public utilities inventory, fuel                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           $ 167,100,000      
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           59,900,000      
Gas Industrial de Monterrey, S.A. de C.V.                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           19,800,000      
Guarantor obligations, amount           28,800,000      
Long-term purchase commitment, obligations outstanding           6,500,000      
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      
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           179,000,000      
Kinder Morgan Gas | Ternium S.A.                  
Disclosure of contingent liabilities [line items]                  
Guarantor obligations, outstanding           $ 85,900,000      
Guarantor obligations, percentage           48.00%      
Iron Ore, Pellets and Iron Ore Fines | ValeS.A.MineracaoCorumbaenseReunidaS.A.                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           $ 304,900,000      
Long-term purchase commitment, minimum percentage of volume required           80.00%      
Natural Gas | Tecpetrol                  
Disclosure of contingent liabilities [line items]                  
Long-term purchase commitment, amount           $ 48,600,000      
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           $ 5,300,000      
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