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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 11,918   $ 11,918   $ 11,526
Allowance for depreciation and depletion (2,871)   (2,871)   (2,340)
Property, plant and equipment, net 9,047   9,047   9,186
Finance lease, right-of-use asset 389   389   411
Depreciation and depletion expense 249 $ 208 547 $ 423  
Middletown          
Property, Plant and Equipment [Line Items]          
Restructuring and Related Cost, Accelerated Depreciation 23   23    
Indiana Harbor          
Property, Plant and Equipment [Line Items]          
Restructuring and Related Cost, Accelerated Depreciation     68    
Land, land improvements and mineral rights          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 1,400   1,400   1,291
Buildings          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 906   906   889
Equipment          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 8,765   8,765   8,709
Other          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment 230   230   229
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total property, plant and equipment $ 617   $ 617   $ 408