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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 12,838   $ 12,838   $ 12,388
Allowance for depreciation and depletion (4,001)   (4,001)   (3,318)
Property, plant and equipment, net 8,837   8,837   9,070
Finance lease, right-of-use asset 485   485   408
Depreciation and depletion expense 247 $ 235 732 $ 782  
Middletown          
Property, Plant and Equipment [Line Items]          
Accelerated depreciation       23  
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 1,388   1,388   1,388
Buildings          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 934   934   921
Equipment          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 9,652   9,652   9,289
Other          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 253   253   238
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 611   $ 611   $ 552