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
Dec. 31, 2020
Mar. 13, 2020
Business Acquisition [Line Items]      
Goodwill $ 994 $ 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
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable (2)    
Inventories 1,320   1,563
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory (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    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Income Taxes 69   0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, 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    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt (1,179)   (1,179)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, 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