Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES - Debt Redemption (Details)

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DEBT AND CREDIT FACILITIES - Debt Redemption (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 03, 2024
Mar. 18, 2024
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument, Redemption [Line Items]        
Aggregate principal amount     $ 3,719 $ 3,192
7.000% 2032 Senior Notes | Cleveland-Cliffs Inc.        
Debt Instrument, Redemption [Line Items]        
Aggregate principal amount   $ 825 $ 825 0
Stated interest rate     7.00%  
Repurchase price if triggering event occurs     101.00%  
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%  
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc.        
Debt Instrument, Redemption [Line Items]        
Aggregate principal amount     $ 189 $ 829
Stated interest rate     6.75%  
Amount of debt extinguished   $ 640    
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. | Subsequent Event        
Debt Instrument, Redemption [Line Items]        
Amount of debt extinguished $ 189