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, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 4,025 $ 4,306
Unamortized discounts and issuance costs (62) (57)
Long-term Debt 3,963 4,249
ABL Facility    
Debt Instrument [Line Items]    
Long-term Line of Credit $ 833  
Cleveland-Cliffs Inc. | 6.750% 2026 Senior Secured Notes    
Debt Instrument [Line Items]    
Stated interest rate 6.75%  
Annual Effective Interest Rate 6.99%  
Long-term Debt, Gross $ 829 829
Cleveland-Cliffs Inc. | 7.000% 2027 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 7.00%  
Annual Effective Interest Rate 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%  
Annual Effective Interest Rate 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%  
Annual Effective Interest Rate 4.625%  
Long-term Debt, Gross $ 368 368
Cleveland-Cliffs Inc. | 4.875% 2031 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 4.875%  
Annual Effective Interest Rate 4.875%  
Long-term Debt, Gross $ 325 325
Cleveland-Cliffs Inc. | 6.250% 2040 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 6.25%  
Annual Effective Interest Rate 6.34%  
Long-term Debt, Gross $ 235 $ 235
Cleveland-Cliffs Inc. | ABL Facility    
Debt Instrument [Line Items]    
Annual Effective Interest Rate 7.091% 5.602%
Long-term Line of Credit $ 833 $ 1,864
Cleveland-Cliffs Inc. | 6.750% 2030 Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 6.75%  
Annual Effective Interest Rate 6.75%  
Long-term Debt, Gross $ 750 0
AK Steel | 7.000% 2027 AK Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate 7.00%  
Annual Effective Interest Rate 9.24%  
Long-term Debt, Gross $ 56 $ 56