Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES - Other Financing Arrangements (Details)

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Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Aggregate principal amount $ 5,369  
AK Steel    
Debt Instrument [Line Items]    
Aggregate principal amount 56  
AK Steel | Industrial Revenue Bonds    
Debt Instrument [Line Items]    
Aggregate principal amount $ 66 $ 92
Weighted average fixed rate 6.86%