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
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 5,115 $ 5,369  
Unamortized discounts and issuance costs (87) (131)  
Long-term Debt 5,028 5,238  
ABL Facility      
Debt Instrument [Line Items]      
Long-term Line of Credit $ 1,715    
Cleveland-Cliffs Inc. | 9.875% 2025 Senior Secured Notes      
Debt Instrument [Line Items]      
Stated interest rate 9.875%   9.875%
Debt Instrument, Interest Rate, Effective Percentage 10.57%    
Long-term Debt, Gross $ 607 607  
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 $ 845 845  
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 $ 500 500  
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 $ 500 500  
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 2.00% 1.87%  
Long-term Line of Credit $ 1,715 $ 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