Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS - AK Steel Allocation of Consideration (Details)

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ACQUISITIONS - AK Steel Allocation of Consideration (Details) - USD ($)
$ in Millions
13 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Mar. 13, 2020
Business Acquisition [Line Items]        
Goodwill   $ 1,072 $ 1,406  
AK Steel        
Business Acquisition [Line Items]        
Cash and cash equivalents $ 39     $ 38
Measurement Period Adjustments, Cash and cash equivalents 1      
Accounts receivable, net 664     666
Measurement Period Adjustments, Accounts receivable, net (2)      
Inventories 1,320     1,563
Measurement Period Adjustments, Inventories (243)      
Other current assets 52     68
Measurement Period Adjustments, Other current assets (16)      
Property, plant and equipment 2,274     2,184
Measurement Period Adjustments, Property, plant, and equipment 90      
Deferred income taxes 69     0
Measurement Period Adjustments, Deferred income taxes 69      
Other non-current assets 471     475
Measurement Period Adjustments, Other non-current assets (4)      
Accounts payable (644)     (636)
Measurement Period Adjustments, Accounts payable (8)      
Accrued employment costs (93)     (94)
Measurement Period Adjustments, Accrued employment costs 1      
Pension and OPEB liabilities, current (78)     (75)
Measurement Period Adjustments, Pension and OPEB liabilities, current (3)      
Other current liabilities (227)     (236)
Measurement Period Adjustments, Other current liabilities 9      
Long-term debt (1,179)     (1,179)
Measurement Period Adjustments, Long-term debt 0      
Pension and OPEB liabilities, non-current (871)     (873)
Measurement Period Adjustments, Pension and OPEB liabilities, noncurrent 2      
Other non-current liabilities (435)     (507)
Measurement Period Adjustments, Other non-current liabilities 72      
Noncontrolling interest (1)     0
Measurement Period Adjustments, Noncontrolling interest (1)      
Net identifiable assets acquired 1,361     1,394
Measurement Period Adjustments, Net identifiable assets acquired (33)      
Goodwill 174     141
Measurement Period Adjustments, Goodwill 33      
Total net assets acquired 1,535     $ 1,535
Measurement Period Adjustments, Total net assets acquired $ 0