v3.25.4
SCOPE OF CONSOLIDATION - Summary of Divestments (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 30, 2025
Dec. 07, 2023
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items]            
Cash and cash equivalents     $ 5,392 $ 6,400 $ 7,686 $ 9,300
Property, plant and equipment     41,041 33,311    
Other assets     1,199 1,578    
Total assets     97,703 89,385    
Current liabilities     22,520 21,825    
Other long-term obligations     1,540 1,422    
Total liabilities     41,167 38,099    
Non-controlling interests     2,070 2,063    
Gain (loss) on disposal     (63) $ 0 $ (1,469)  
Disposal group, disposed of by sale, not discontinued operations | AMZ            
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items]            
Cash and cash equivalents $ 10          
Other current assets 120          
Property, plant and equipment 0          
Other assets 1          
Total assets 131          
Current liabilities 82          
Other long-term obligations 1          
Total liabilities 83          
Total net assets 48          
Non-controlling interests 30          
Total net assets disposed of 18          
Goodwill allocation 0          
Consideration 0          
Reclassification of foreign exchange and other (43)   $ (43)      
Gain (loss) on disposal (61)          
Disposal group, disposed of by sale, not discontinued operations | AMTPI            
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items]            
Cash and cash equivalents 0          
Other current assets 11          
Property, plant and equipment 0          
Other assets 3          
Total assets 14          
Current liabilities 10          
Other long-term obligations 10          
Total liabilities 20          
Total net assets (6)          
Non-controlling interests 0          
Total net assets disposed of (6)          
Goodwill allocation 0          
Consideration 0          
Reclassification of foreign exchange and other (8)          
Gain (loss) on disposal $ (2)          
Disposal group, disposed of by sale, not discontinued operations | ArcelorMittal Temirtau            
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items]            
Cash and cash equivalents   $ 24        
Other current assets   645        
Property, plant and equipment   972        
Other assets   9        
Total assets   1,650        
Current liabilities   882        
Other long-term obligations   490        
Total liabilities   1,372        
Total net assets   278        
Non-controlling interests   0        
Total net assets disposed of   278        
Goodwill allocation   (194)        
Consideration   278        
Reclassification of foreign exchange and other   (1,469)        
Gain (loss) on disposal   $ (1,663)