Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES - Debt Redemption (Details)

v3.24.3
DEBT AND CREDIT FACILITIES - Debt Redemption (Details) - USD ($)
$ in Millions
9 Months Ended
Aug. 16, 2024
Apr. 03, 2024
Mar. 18, 2024
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument, Redemption [Line Items]          
Aggregate principal amount       $ 3,835 $ 3,192
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc.          
Debt Instrument, Redemption [Line Items]          
Aggregate principal amount       $ 0 829
Stated interest rate       6.75%  
Amount of debt extinguished   $ 189 $ 640    
7.000% 2032 Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument, Redemption [Line Items]          
Aggregate principal amount $ 600   $ 825 $ 1,425 $ 0
Stated interest rate       7.00%  
Repurchase price if triggering event occurs       101.00%  
Debt issuance price as a percent of face amount 99.25%        
7.000% 2032 Senior Notes | Cleveland-Cliffs Inc. | Minimum          
Debt Instrument, Redemption [Line Items]          
Redemption notice period       10 days  
7.000% 2032 Senior Notes | Cleveland-Cliffs Inc. | Maximum          
Debt Instrument, Redemption [Line Items]          
Redemption notice period       60 days  
7.000% 2032 Senior Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc.          
Debt Instrument, Redemption [Line Items]          
Redemption price percentage       100.00%  
7.000% 2032 Senior Notes | Debt Instrument, Redemption, Period One, Upon Equity Issuance | Cleveland-Cliffs Inc.          
Debt Instrument, Redemption [Line Items]          
Redemption price percentage       107.00%  
Percentage of principal available for redemption       35.00%  
7.000% 2032 Senior Notes | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc.          
Debt Instrument, Redemption [Line Items]          
Redemption price percentage       103.50%  
7.000% 2032 Senior Notes | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc.          
Debt Instrument, Redemption [Line Items]          
Redemption price percentage       101.75%