Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details)

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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 4,731 $ 5,369
Unamortized discounts and issuance costs (63) (131)
Long-term Debt 4,668 5,238
ABL Facility    
Debt Instrument [Line Items]    
Long-term Line of Credit $ 2,245  
Cleveland-Cliffs Inc. | 9.875% 2025 Senior Secured Notes    
Debt Instrument [Line Items]    
Stated interest rate 9.875%  
Debt Instrument, Interest Rate, Effective Percentage 10.57%  
Long-term Debt, Gross $ 0 607
Cleveland-Cliffs Inc. | 6.750% 2026 Senior Secured Notes    
Debt Instrument [Line Items]    
Stated interest rate 6.75%  
Debt Instrument, Interest Rate, Effective Percentage 6.99%  
Long-term Debt, Gross $ 829 845
Cleveland-Cliffs Inc. | 1.500% 2025 Convertible Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 1.50%  
Debt Instrument, Interest Rate, Effective Percentage 6.26%  
Long-term Debt, Gross $ 0 294
Cleveland-Cliffs Inc. | 7.000% 2027 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 7.00%  
Debt Instrument, Interest Rate, Effective Percentage 9.24%  
Long-term Debt, Gross $ 73 73
Cleveland-Cliffs Inc. | 5.875% 2027 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 5.875%  
Debt Instrument, Interest Rate, Effective Percentage 6.49%  
Long-term Debt, Gross $ 556 556
Cleveland-Cliffs Inc. | 4.625% 2029 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 4.625%  
Debt Instrument, Interest Rate, Effective Percentage 4.63%  
Long-term Debt, Gross $ 370 500
Cleveland-Cliffs Inc. | 4.875% 2031 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 4.875%  
Debt Instrument, Interest Rate, Effective Percentage 4.88%  
Long-term Debt, Gross $ 339 500
Cleveland-Cliffs Inc. | 6.250% 2040 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 6.25%  
Debt Instrument, Interest Rate, Effective Percentage 6.34%  
Long-term Debt, Gross $ 263 $ 263
Cleveland-Cliffs Inc. | ABL Facility    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 2.75% 1.87%
Long-term Line of Credit $ 2,245 $ 1,609
AK Steel | 7.000% 2027 AK Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 7.00%  
Debt Instrument, Interest Rate, Effective Percentage 9.24%  
Long-term Debt, Gross $ 56 56
AK Steel | Industrial Revenue Bonds    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 0 $ 66