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EQUITY AND NON-CONTROLLING INTERESTS (Details)
€ / shares in Units, $ / shares in Units, € in Millions, $ in Millions, R$ in Billions
 6 Months Ended 7 Months Ended
Jun. 08, 2022
USD ($)
$ / shares
Jun. 08, 2022
EUR (€)
€ / shares
shares
May 18, 2022
shares
May 04, 2022
USD ($)
$ / shares
Apr. 25, 2022
USD ($)
$ / shares
Apr. 25, 2022
EUR (€)
€ / shares
shares
Mar. 30, 2022
BRL (R$)
multiple
Jan. 14, 2021
shares
Jun. 30, 2022
USD ($)
shares
Jul. 29, 2022
USD ($)
shares
Jun. 30, 2022
BRL (R$)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 28, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of classes of share capital [line items]                              
Number of treasury shares cancelled (in shares) | shares     60,000,000         45,000,000              
Treasury share repurchase program, authorised amount $ 1,000       $ 1,000       $ 2,000       $ 1,000    
Number of shares issued (in shares) | shares                 877,809,772   877,809,772 982,809,772      
Equity                 $ 56,446     $ 51,344   $ 46,325 $ 40,237
Authorised share capital                 $ 404     $ 442      
Shares authorized (in shares) | shares                 1,136,418,599   1,136,418,599 1,241,418,599      
Dividends (in USD per share) | $ / shares       $ 0.38                      
Dividends paid, ordinary shares       $ 332                      
Dividends recognised as distributions to non-controlling interests                 $ 158            
Dividends paid to non-controlling interests                 $ 178            
Shares buyback (in shares) | shares   33,349,597       31,751,960                  
Payments for repurchase of equity | €   € 943       € 911                  
Average cost per share (in USD/EUR per share) | (per share) $ 29.99 € 28.26     $ 31.49 € 28.68                  
Treasury shares (in shares) | shares                 31,200,000   31,200,000 71,900,000      
EBITDA Mutiple | multiple             6                
ArcelorMittal Brasil S.A.                              
Disclosure of classes of share capital [line items]                              
Net debt | R$             R$ 6.2                
Percentage of 6x EBITDA             15.00%                
Consideration payable related to put option                 $ 200   R$ 0.8        
ArcelorMittal Brasil S.A. | Votorantim S.A.                              
Disclosure of classes of share capital [line items]                              
Proportion of ownership interests held by non-controlling interests             2.99%                
Potential ordinary share transactions                              
Disclosure of classes of share capital [line items]                              
Treasury share repurchase program, authorised amount                   $ 1,400          
Treasury share repurchase program, authorised no of shares (in shares) | shares                   60,431,380          
Treasury share repurchase program, total authorised amount in period                   $ 3,400          
Share capital                              
Disclosure of classes of share capital [line items]                              
Equity                 $ 312     $ 350   $ 393 $ 393