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Statements of Consolidated Changes in Equity - USD ($)
$ in Millions
Total
AK Steel [Member]
ArcelorMittal USA [Member]
Common Stock [Member]
Common Stock [Member]
AK Steel [Member]
Common Stock [Member]
ArcelorMittal USA [Member]
Capital in Excess of Par Value of Shares [Member]
Capital in Excess of Par Value of Shares [Member]
AK Steel [Member]
Capital in Excess of Par Value of Shares [Member]
ArcelorMittal USA [Member]
Retained Earnings [Member]
Common Shares in Treasury [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
AK Steel [Member]
Noncontrolling Interest [Member]
ArcelorMittal USA [Member]
Balance, beginning of period (in shares) at Dec. 31, 2017       297,000,000                      
Balance, beginning of period at Dec. 31, 2017 $ (445)     $ 37     $ 3,934     $ (4,207) $ (170) $ (39) $ 0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Adoption of accounting standard | Accounting Standards Update 2014-09 34                 34          
Comprehensive income 883                 1,128   (245) 0    
Stock and other incentive plans (in shares)       1,000,000                      
Stock and other incentive plans, APIC             (17)                
Stock and other incentive plans 14                   31        
Common stock repurchases (in shares)       (5,000,000)                      
Common stock repurchased (value) $ (47)                   (47)        
Common Stock, Dividends, Per Share, Declared $ 0.05                            
Common stock dividends $ (15)                 (15)          
Balance, end of period (in shares) at Dec. 31, 2018       293,000,000                      
Balance, end of period at Dec. 31, 2018 424     $ 37     3,917     (3,060) (186) (284) 0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Comprehensive income 258                 293   (35) 0    
Stock and other incentive plans (in shares)       2,000,000                      
Stock and other incentive plans, APIC             (44)                
Stock and other incentive plans 4                   48        
Common stock repurchases (in shares)       (24,000,000)                      
Common stock repurchased (value) $ (253)                   (253)        
Common Stock, Dividends, Per Share, Declared $ 0.27                            
Common stock dividends $ (75)                 (75)          
Balance, end of period (in shares) at Dec. 31, 2019 270,084,005     271,000,000                      
Balance, end of period at Dec. 31, 2019 $ 358     $ 37     3,873     (2,842) (391) (319) 0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Comprehensive income 105                 (122)   186 41    
Stock and other incentive plans (in shares)       2,000,000                      
Stock and other incentive plans, APIC             (24)                
Stock and other incentive plans $ 13                   37        
Stock Issued During Period, Shares, Acquisitions         127,000,000 78,000,000                  
Stock Issued During Period, Value, Acquisitions   $ 948 $ 1,003   $ 16 $ 10   $ 602 $ 980            
Noncontrolling Interest, Increase from Business Combination                           $ 330 $ 13
Common Stock, Dividends, Per Share, Declared $ 0.06                            
Common stock dividends $ (25)                 (25)          
Distributions of partnership equity $ (61)                       (61)    
Balance, end of period (in shares) at Dec. 31, 2020 477,517,372     478,000,000                      
Balance, end of period at Dec. 31, 2020 $ 2,341     $ 63     $ 5,431     $ (2,989) $ (354) $ (133) $ 323