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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Shareholder claims, Mexican income tax adjustment & Argentine tax claim) (Details)
$ in Millions, R$ in Billions
 1 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2016
BRL (R$)
Comissão de Valores Mobiliários | Usinas Siderurgicas de Minas Gerais S.A. - USIMINAS      
Disclosure of contingent liabilities [line items]      
Increase in capital | R$     R$ 1
Mexican Tax Authority      
Disclosure of contingent liabilities [line items]      
Adjustments for current tax of prior periods   $ 47.2  
Mexican Tax Authority | 2008      
Disclosure of contingent liabilities [line items]      
Increase (Decrease) In Contingent Tax Liability   15.5  
Mexican Tax Authority | 2011      
Disclosure of contingent liabilities [line items]      
Increase (Decrease) In Contingent Tax Liability   $ 31.7  
Domestic Tax Authority | Mexican Tax Authority | 2008      
Disclosure of contingent liabilities [line items]      
Tax contingent liability $ 64.7    
Domestic Tax Authority | Mexican Tax Authority | 2011      
Disclosure of contingent liabilities [line items]      
Tax contingent liability $ 31.7