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
Apr. 14, 2023
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Long-term Debt, Gross   $ 4,613 $ 4,306
Unamortized discounts and issuance costs   (54) (57)
Long-term Debt   4,559 4,249
ABL Facility      
Debt Instrument [Line Items]      
Long-term Line of Credit   $ 2,171  
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   4.63%  
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   4.88%  
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   6.40% 5.60%
Long-term Line of Credit   $ 2,171 $ 1,864
Cleveland-Cliffs Inc. | 6.750% 2030 Senior Notes | Subsequent Event      
Debt Instrument [Line Items]      
Stated interest rate 6.75%    
Long-term Debt, Gross $ 750    
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