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CONTINGENCIES (Details)
$ in Millions
 1 Months Ended 6 Months Ended 60 Months Ended
Jan. 04, 2022
bankAccount
Jan. 31, 2022
USD ($)
Aug. 31, 2021
USD ($)
Apr. 30, 2017
USD ($)
Jun. 30, 2022
USD ($)
claim
Dec. 31, 2018
USD ($)
claim
Apr. 30, 2022
USD ($)
Social Security tax              
Disclosure of other provisions [line items]              
Unused provision reversed         $ 240    
Social Security tax | ArcelorMittal Brasil S.A.              
Disclosure of other provisions [line items]              
Number of claims filed | claim         6 6  
Tax penalty sought   $ 13       $ 38  
Reduction in tax penalty sought           $ 4  
Other legal claims and contingencies | Shareholder of Siderurgica Tres Lagoas              
Disclosure of other provisions [line items]              
Damages sought       $ 32      
Estimated financial effect of contingent liabilities             $ 126
Estimated financial effect of contingent liabilities, net             $ 67
Ukrainian tax audit | ArcelorMittal Kryvyi Rih              
Disclosure of other provisions [line items]              
Damages sought     $ 96        
Number of bank accounts, blocked | bankAccount 3            
Number of bank accounts, restrictions lifted | bankAccount 2