Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details)

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DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 11, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 914   $ 1,274  
Gain (Loss) on Extinguishment of Debt   (66) $ (22) (80) $ (88)
9.875% 2025 Senior Secured Notes          
Extinguishment of Debt [Line Items]          
Debt Extinguished $ 322 607   607  
Gain (Loss) on Extinguishment of Debt   $ (85)   $ (85)  
9.875% 2025 Senior Secured Notes | Cleveland-Cliffs Inc.          
Extinguishment of Debt [Line Items]          
Stated interest rate   9.875%   9.875%  
6.750% 2026 Senior Secured Notes          
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 16   $ 16  
Gain (Loss) on Extinguishment of Debt   $ (1)   $ (1)  
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc.          
Extinguishment of Debt [Line Items]          
Stated interest rate   6.75%   6.75%  
1.500% 2025 Convertible Senior Notes          
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 0   $ 294  
Gain (Loss) on Extinguishment of Debt   $ 0   $ (16)  
1.500% 2025 Convertible Senior Notes | Cleveland-Cliffs Inc.          
Extinguishment of Debt [Line Items]          
Stated interest rate   1.50%   1.50%  
4.625% 2029 Senior Notes          
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 130   $ 130  
Gain (Loss) on Extinguishment of Debt   $ 8   $ 8  
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc.          
Extinguishment of Debt [Line Items]          
Stated interest rate   4.625%   4.625%  
4.875% 2031 Senior Notes          
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 161   $ 161  
Gain (Loss) on Extinguishment of Debt   $ 12   $ 12  
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc.          
Extinguishment of Debt [Line Items]          
Stated interest rate   4.875%   4.875%  
Industrial Revenue Bonds          
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 0   $ 66  
Gain (Loss) on Extinguishment of Debt   $ 0   $ 2