Annual report pursuant to Section 13 and 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
Dec. 31, 2023
Apr. 14, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Total debt $ 3,192   $ 4,306
Unamortized discounts and issuance costs (55)   (57)
Total long-term debt $ 3,137   4,249
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Stated interest rate 6.75%    
Annual Effective Interest Rate 6.99%    
Total debt $ 829   829
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Stated interest rate 7.00%    
Annual Effective Interest Rate 9.24%    
Total debt $ 73   73
7.000% 2027 AK Senior Notes | AK Steel      
Debt Instrument [Line Items]      
Stated interest rate 7.00%    
Annual Effective Interest Rate 9.24%    
Total debt $ 56   56
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Stated interest rate 5.875%    
Annual Effective Interest Rate 6.49%    
Total debt $ 556   556
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Stated interest rate 4.625%    
Annual Effective Interest Rate 4.625%    
Total debt $ 368   368
6.750% 2030 Senior Notes | Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Stated interest rate 6.75%    
Annual Effective Interest Rate 6.75%    
Total debt $ 750 $ 750 0
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Stated interest rate 4.875%    
Annual Effective Interest Rate 4.875%    
Total debt $ 325   325
6.250% 2040 Senior Notes | Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Stated interest rate 6.25%    
Annual Effective Interest Rate 6.34%    
Total debt $ 235   $ 235
ABL Facility      
Debt Instrument [Line Items]      
Credit facility, amount outstanding 0    
ABL Facility | Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Annual Effective Interest Rate     5.60%
Credit facility, amount outstanding $ 0   $ 1,864