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, 2024
Mar. 18, 2024
Dec. 31, 2023
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 3,558   $ 3,192
Unamortized discounts and issuance costs (51)   (55)
Long-term Debt 3,507   3,137
ABL Facility      
Debt Instrument [Line Items]      
Long-term Line of Credit $ 370    
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 $ 0   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. | 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   750
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. | 7.000% 2032 Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate 7.00%    
Annual Effective Interest Rate 7.00%    
Long-term Debt, Gross $ 825 $ 825 0
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 6.69%    
Long-term Line of Credit $ 370   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