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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Fishermen association claims, Tax assessment relating to the use of certain ICMS tax credits) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 07, 2017
Dec. 31, 2020
Dec. 31, 2019
Disclosure of contingent liabilities [line items]      
Asset recognised for expected reimbursement, contingent liabilities in business combination   $ 0 $ 254,446
Gain from derecognition of contingent liabilities   186,000  
Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda.      
Disclosure of contingent liabilities [line items]      
Tax benefit recognised as of acquisition date $ 1,089,000    
Acquisitions through business combinations, other provisions 651,800    
Asset recognised for expected reimbursement, contingent liabilities in business combination 325,900 194,100 254,400
Contingent liabilities recognised in business combination   380,100 508,900
Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda. | Other environment related provision      
Disclosure of contingent liabilities [line items]      
Other provisions 24,500 10,900 14,100
Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda. | Legal proceedings contingent liability      
Disclosure of contingent liabilities [line items]      
Other provisions $ 57,700 $ 34,900 $ 45,000