Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES - Debt Redemption (Details)

v3.23.3
DEBT AND CREDIT FACILITIES - Debt Redemption (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Apr. 14, 2023
Dec. 31, 2022
Debt Instrument, Redemption [Line Items]      
Aggregate principal amount $ 3,517   $ 4,306
6.750% 2030 Senior Notes | Cleveland-Cliffs Inc.      
Debt Instrument, Redemption [Line Items]      
Aggregate principal amount $ 750 $ 750 $ 0
Repurchase price if triggering event occurs 101.00%    
6.750% 2030 Senior Notes | Cleveland-Cliffs Inc. | Minimum      
Debt Instrument, Redemption [Line Items]      
Redemption notice period 10 days    
6.750% 2030 Senior Notes | Cleveland-Cliffs Inc. | Maximum      
Debt Instrument, Redemption [Line Items]      
Redemption notice period 60 days    
6.750% 2030 Senior Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc.      
Debt Instrument, Redemption [Line Items]      
Redemption price percentage 100.00%    
6.750% 2030 Senior Notes | Debt Instrument, Redemption, Period One, Upon Equity Issuance | Cleveland-Cliffs Inc.      
Debt Instrument, Redemption [Line Items]      
Redemption price percentage 106.75%    
Percentage of principal available for redemption 35.00%    
6.750% 2030 Senior Notes | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc.      
Debt Instrument, Redemption [Line Items]      
Redemption price percentage 103.375%    
6.750% 2030 Senior Notes | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc.      
Debt Instrument, Redemption [Line Items]      
Redemption price percentage 101.688%