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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Commitments: m-ac) (Details)
m³ in Thousands, T in Millions, $ in Millions
 1 Months Ended 12 Months Ended 108 Months Ended
Mar. 31, 2017
Jun. 30, 2016
MW
Dec. 31, 2023
USD ($)
m³
credit
T
Dec. 31, 2006
distributor
MW
Dec. 31, 2023
USD ($)
m³
credit
T
Feb. 13, 2019
USD ($)
Oct. 15, 2012
Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 139.7        
24 Distributos (CCEAR)              
Disclosure of contingent liabilities [line items]              
Long-term contract for purchase of electric power, term       15 years      
Number of distributors | distributor       24      
Long-term contract for purchase of electric power, electrical demand | MW       200      
Vale S.A. | Iron Ore, Pellets and Iron Ore Fines              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, total purchased volume | T     8.0        
Primetals Technologies Brazil Ltda. | Maintenance Services              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 21.3        
Air Liquide Brasil Ltda., AirSteel Ltda., White Martins Gases Industriais Ltda., White Martins Steel Ltda. and ThyssenKrupp MinEnergy GmbH | Industrial Gas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 170.2        
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            
Long-term purchase commitment, extension period for maintenance services of turbines     4 years        
GE Global Parts and Products GMBH, General Electric International Inc. and Alstom Energia Térmica e Indústria Ltda. | Turbine Maintenance              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 176.9        
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%        
Companhia Distribuidora de Gás do Rio de Janeiro | Natural Gas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 38.6        
Long-term purchase commitment, renewal period     2 years        
Long-term purchase commitment, volume | m³     61,300        
LSI Logistica S.A.              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 1.4        
Unicarbo Ltda.              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     49.6        
Cemig S.A. | Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     199.2        
Cemig S.A. | Usiminas | Bottom of range              
Disclosure of contingent liabilities [line items]              
Long-term contract for purchase of electric power, electrical demand | MW   32          
Cemig S.A. | Usiminas | Top of range              
Disclosure of contingent liabilities [line items]              
Long-term contract for purchase of electric power, electrical demand | MW   65.4          
Engie S.A | Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     55.1        
Enel S.A | Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     58.6        
Canadian Solar S.A. | Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     149.5        
Comgas S.A | Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 53.8        
Long-term contract for purchase of electric power, capacity | m³     240   240    
Long-term contract for purchase of electric power, daily capacity deviation     0.05   0.05    
Long-term contract for purchase of electric power, take or pay volume     0.80   0.80    
Gasmig S.A. | Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 197.9        
Long-term contract for purchase of electric power, capacity | m³     850   850    
Long-term contract for purchase of electric power, daily capacity deviation     0.10   0.10    
Long-term contract for purchase of electric power, take or pay volume     0.80   0.80    
MBL Materiais Básicos Ltda. | Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, amount     $ 336.9        
Long-term purchase commitment, term             30 years
MBL Materiais Básicos Ltda. | Iron Ore | Usiminas              
Disclosure of contingent liabilities [line items]              
Long-term purchase commitment, minimum volume | T         3.6    
Syndicated Loan | Techgen S.A. de C.V.              
Disclosure of contingent liabilities [line items]              
Original principal amount           $ 640.0  
Borrowings outstanding     49.6   $ 49.6    
Financial Guarantee | Syndicated Loan | Techgen S.A. de C.V.              
Disclosure of contingent liabilities [line items]              
Guarantor obligations, outstanding     $ 23.8   $ 23.8    
Financial Guarantee | Syndicated Loan | Techgen S.A. de C.V.              
Disclosure of contingent liabilities [line items]              
Number of stand-by letters of credit | credit     2   2    
Guarantor obligations, percentage     48.00%