Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS - Preliminary purchase price allocation (Details)

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ACQUISITIONS - Preliminary purchase price allocation (Details) - USD ($)
$ in Millions
 13 Months Ended
Dec. 31, 2021
Mar. 31, 2021
Nov. 18, 2021
Dec. 31, 2020
Dec. 09, 2020
Mar. 13, 2020
Business Acquisition [Line Items]            
Goodwill $ 1,116     $ 1,406    
Measurement Period Adjustments, Other non-current liabilities   $ (72)        
Ferrous Processing and Trading            
Business Acquisition [Line Items]            
Cash and cash equivalents     $ 9      
Accounts receivable, net     233      
Inventories     137      
Other current assets     4      
Property, plant and equipment     179      
Other non-current assets     74      
Accounts payable     (122)      
Accrued employment costs     (8)      
State and local taxes     (1)      
Other current liabilities     (8)      
Other non-current liabilities     (21)      
Net identifiable assets acquired     476      
Goodwill     279      
Total net assets acquired     $ 755      
ArcelorMittal USA            
Business Acquisition [Line Items]            
Cash and cash equivalents 35       $ 35  
Accounts receivable, net 346       349  
Inventories 2,129       2,115  
Other current assets 36       34  
Property, plant and equipment 4,404       4,017  
Deferred income taxes 285       0  
Other non-current assets 165       158  
Accounts payable (728)       (736)  
Accrued employment costs (266)       (271)  
State and local taxes (76)       (76)  
Other current liabilities (430)       (453)  
Pension liability, non-current (730)       (730)  
OPEB liability, non-current (2,465)       (2,465)  
Other non-current liabilities (769)       (598)  
Noncontrolling interest (8)       (13)  
Net identifiable assets acquired 1,944       1,366  
Goodwill 660       1,230  
Total net assets acquired 2,604       $ 2,596  
Measurement Period Adjustments, Cash and cash equivalents 0          
Measurement Period Adjustments, Accounts receivable, net (3)          
Measurement Period Adjustments, Inventories 14          
Measurement Period Adjustments, Other current assets 2          
Measurement Period Adjustments, Property, plant and equipment 387          
Measurement Period Adjustments, Deferred income taxes 285          
Measurement Period Adjustments, Other non-current assets 7          
Measurement Period Adjustments, Accounts payable 8          
Measurement Period Adjustments, Accrued employment costs 5          
Measurement Period Adjustments, State and local taxes 0          
Measurement Period Adjustments, Other current liabilities 23          
Measurement Period Adjustments, Pension liability, non-current 0          
Measurement Period Adjustments, OPEB liability, non-current 0          
Measurement Period Adjustments, Other non-current liabilities (171)          
Measurement Period Adjustments, Noncontrolling interest 21          
Measurement Period Adjustments, Net identifiable assets acquired 578          
Measurement Period Adjustments, Goodwill (570)          
Measurement Period Adjustments, Total net assets acquired $ 8          
AK Steel            
Business Acquisition [Line Items]            
Cash and cash equivalents   39       $ 38
Accounts receivable, net   664       666
Inventories   1,320       1,563
Other current assets   52       68
Property, plant and equipment   2,274       2,184
Deferred income taxes   69       0
Other non-current assets   471       475
Accounts payable   (644)       (636)
Accrued employment costs   (93)       (94)
State and local taxes   (31)       (35)
Other current liabilities   (274)       (276)
Long-term debt   (1,179)       (1,179)
Pension liability, non-current   (463)       (473)
OPEB liability, non-current   (408)       (400)
Other non-current liabilities   (435)       (507)
Noncontrolling interest   (1)       0
Net identifiable assets acquired   1,361       1,394
Goodwill   174       141
Total net assets acquired   1,535       $ 1,535
Measurement Period Adjustments, Cash and cash equivalents   1        
Measurement Period Adjustments, Accounts receivable, net   (2)        
Measurement Period Adjustments, Inventories   243        
Measurement Period Adjustments, Other current assets   16        
Measurement Period Adjustments, Property, plant and equipment   90        
Measurement Period Adjustments, Deferred income taxes   69        
Measurement Period Adjustments, Other non-current assets   4        
Measurement Period Adjustments, Accounts payable   8        
Measurement Period Adjustments, Accrued employment costs   1        
Measurement Period Adjustments, State and local taxes   4        
Measurement Period Adjustments, Other current liabilities   2        
Measurement Period Adjustments, Long-term debt   0        
Measurement Period Adjustments, Pension liability, non-current   10        
Measurement Period Adjustments, OPEB liability, non-current   (8)        
Measurement Period Adjustments, Noncontrolling interest   1        
Measurement Period Adjustments, Net identifiable assets acquired   (33)        
Measurement Period Adjustments, Goodwill   33        
Measurement Period Adjustments, Total net assets acquired   $ 0