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, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Total debt $ 4,306 $ 5,369
Unamortized discounts and issuance costs (57) (131)
Total long-term debt $ 4,249 5,238
9.875% 2025 Senior Secured Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 9.875%  
Annual Effective Interest Rate 10.57%  
Total debt $ 0 607
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 $ 829 845
1.500% 2025 Convertible Senior Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 1.50%  
Annual Effective Interest Rate 6.26%  
Total debt $ 0 294
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 4.63%  
Total debt $ 368 500
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 4.875%  
Annual Effective Interest Rate 4.88%  
Total debt $ 325 500
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 $ 235 263
Industrial Revenue Bonds | AK Steel    
Debt Instrument [Line Items]    
Total debt 0 $ 66
ABL Facility    
Debt Instrument [Line Items]    
Credit facility, amount outstanding $ 1,864  
ABL Facility | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Annual Effective Interest Rate 5.60% 1.87%
Credit facility, amount outstanding $ 1,864 $ 1,609