Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.2.2
DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 11, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 41   $ 1,315  
Gain (Loss) on Extinguishment   4 $ 0 (76) $ (88)
9.875% 2025 Senior Secured Notes          
Extinguishment of Debt [Line Items]          
Debt Extinguished $ 322 0   607  
Gain (Loss) on Extinguishment   $ 0   $ (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   $ 0   $ 16  
Gain (Loss) on Extinguishment   $ 0   $ (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   $ 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   $ 0   $ 130  
Gain (Loss) on Extinguishment   $ 0   $ 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   $ 13   $ 174  
Gain (Loss) on Extinguishment   $ 1   $ 13  
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc.          
Extinguishment of Debt [Line Items]          
Stated interest rate   4.875%   4.875%  
6.250% 2040 Senior Notes          
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 28   $ 28  
Gain (Loss) on Extinguishment   $ 3   $ 3  
6.250% 2040 Senior Notes | Cleveland-Cliffs Inc.          
Extinguishment of Debt [Line Items]          
Stated interest rate   6.25%   6.25%  
Industrial Revenue Bonds          
Extinguishment of Debt [Line Items]          
Debt Extinguished   $ 0   $ 66  
Gain (Loss) on Extinguishment   $ 0   $ 2