Quarterly report pursuant to Section 13 or 15(d)

PROPERTY, PLANT AND EQUIPMENT (Details)

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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment $ 12,500   $ 12,388
Allowance for depreciation and depletion (3,550)   (3,318)
Property, plant and equipment, net 8,950   9,070
Finance lease, right-of-use asset 424   408
Depreciation and depletion expense 239 $ 298  
Indiana Harbor      
Property, Plant and Equipment [Line Items]      
Accelerated depreciation   $ 68  
Land, land improvements and mineral rights      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 1,390   1,388
Buildings      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 927   921
Equipment      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 9,359   9,289
Other      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment 244   238
Construction in progress      
Property, Plant and Equipment [Line Items]      
Total property, plant and equipment $ 580   $ 552