Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES - Debt Issuances and Terms (Details)

v3.22.4
DEBT AND CREDIT FACILITIES - Debt Issuances and Terms (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Total debt $ 4,306 $ 5,369
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 6.75%  
Repurchase price if triggering event occurs 101.00%  
Total debt $ 829 845
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price, percentage 105.063%  
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price, percentage 103.375%  
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Three    
Debt Instrument [Line Items]    
Redemption price, percentage 101.688%  
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 7.00%  
Total debt $ 73 73
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price, percentage 103.50%  
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price, percentage 102.333%  
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Three    
Debt Instrument [Line Items]    
Redemption price, percentage 101.167%  
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 5.875%  
Total debt $ 556 556
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price, percentage 102.938%  
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price, percentage 101.958%  
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Three    
Debt Instrument [Line Items]    
Redemption price, percentage 100.979%  
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 4.625%  
Total debt $ 368 500
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price, percentage 102.313%  
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price, percentage 101.156%  
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One, Upon Equity Issuance    
Debt Instrument [Line Items]    
Redemption price, percentage 104.625%  
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 4.875%  
Total debt $ 325 500
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price, percentage 102.438%  
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price, percentage 101.625%  
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Three    
Debt Instrument [Line Items]    
Redemption price, percentage 100.813%  
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One, Upon Equity Issuance    
Debt Instrument [Line Items]    
Redemption price, percentage 104.875%  
6.250% 2040 Senior Notes | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Stated interest rate 6.25%  
Total debt $ 235 263
6.250% 2040 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price, percentage 100.00%  
7.000% 2027 AK Senior Notes | AK Steel    
Debt Instrument [Line Items]    
Stated interest rate 7.00%  
Total debt $ 56 $ 56
7.000% 2027 AK Senior Notes | AK Steel | Debt Instrument, Redemption, Period One    
Debt Instrument [Line Items]    
Redemption price, percentage 103.50%  
7.000% 2027 AK Senior Notes | AK Steel | Debt Instrument, Redemption, Period Two    
Debt Instrument [Line Items]    
Redemption price, percentage 102.333%  
7.000% 2027 AK Senior Notes | AK Steel | Debt Instrument, Redemption, Period Three    
Debt Instrument [Line Items]    
Redemption price, percentage 101.167%  
Unsecured Debt | Cleveland-Cliffs Inc.    
Debt Instrument [Line Items]    
Repurchase price if triggering event occurs 101.00%