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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 12,655   $ 12,655   $ 12,388
Allowance for depreciation and depletion (3,777)   (3,777)   (3,318)
Property, plant and equipment, net 8,878   8,878   9,070
Finance lease, right-of-use asset 467   467   408
Depreciation and depletion expense 246 $ 249 485 $ 547  
Indiana Harbor          
Property, Plant and Equipment [Line Items]          
Accelerated depreciation       68  
Middletown          
Property, Plant and Equipment [Line Items]          
Accelerated depreciation   $ 23   $ 23  
Land, land improvements and mineral rights          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 1,388   1,388   1,388
Buildings          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 932   932   921
Equipment          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 9,578   9,578   9,289
Other          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 247   247   238
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 510   $ 510   $ 552