v3.25.4
SCOPE OF CONSOLIDATION - Divestments Narrative (Details)
$ in Millions
 12 Months Ended
Oct. 30, 2025
USD ($)
facility
Dec. 07, 2023
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about business combination [line items]            
Total assets     $ 97,703 $ 89,385    
Total liabilities     41,167 38,099    
Cost of sales     56,976 56,653 $ 63,538  
Income from investments in associates, joint ventures and other investments     806 779 1,184  
Gain (loss) arising during the period     2,922 (3,325) 1,013  
Cash and cash equivalents     5,392 $ 6,400 $ 7,686 $ 9,300
AMZ            
Disclosure of detailed information about business combination [line items]            
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation     205      
AMZ | Impairment Loss            
Disclosure of detailed information about business combination [line items]            
Cost of sales     194      
Income from investments in associates, joint ventures and other investments     11      
AMZ | Impairment Loss | Property, plant and equipment            
Disclosure of detailed information about business combination [line items]            
Cost of sales     143      
AMZ | Impairment Loss | Current assets            
Disclosure of detailed information about business combination [line items]            
Cost of sales     51      
AMZ | Disposal group, disposed of by sale, not discontinued operations            
Disclosure of detailed information about business combination [line items]            
Consideration received $ 0          
Total assets 131          
Total liabilities 83          
Gain (loss) arising during the period     (61)      
Reclassification of foreign exchange reserve 43   43      
Cash and cash equivalents $ 10          
ArcelorMittal Temirtau | Disposal group, disposed of by sale, not discontinued operations            
Disclosure of detailed information about business combination [line items]            
Consideration received   $ 286        
Total assets   1,650        
Total liabilities   1,372        
Reclassification of foreign exchange reserve   1,469        
Consideration paid (received) net of cash disposed of   254        
Cash and cash equivalents   24        
Transaction costs   8        
Consideration received through repayment of intra-group dues   250        
Sovereign-fund guaranteed payment     $ 450      
Impairment loss recognised in profit or loss, property, plant and equipment   732        
Impairment of goodwill   $ 194        
AMTPI | Disposal group, disposed of by sale, not discontinued operations            
Disclosure of detailed information about business combination [line items]            
Number of tubular products facilities | facility 2