v3.25.2
ASSETS HELD FOR SALE Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of associates [line items]    
Cost of sales $ 28,548 $ 29,157
Income from investments in associates, joint ventures and other investments 346 423
Gains (losses) on exchange differences on translation of foreign operations, before tax (2,992) $ 1,761
ArcelorMittal Zenica and ArcelorMittal Prijedor    
Disclosure of associates [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  
Gains (losses) on exchange differences on translation of foreign operations, before tax 43  
ArcelorMittal Zenica and ArcelorMittal Prijedor | Impairment loss    
Disclosure of associates [line items]    
Cost of sales 194  
Income from investments in associates, joint ventures and other investments 11  
ArcelorMittal Zenica and ArcelorMittal Prijedor | Property, plant and equipment | Impairment loss    
Disclosure of associates [line items]    
Cost of sales 143  
ArcelorMittal Zenica and ArcelorMittal Prijedor | Current assets | Impairment loss    
Disclosure of associates [line items]    
Cost of sales 51  
AMTBA    
Disclosure of associates [line items]    
Gains (losses) on exchange differences on translation of foreign operations, before tax $ 1