Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details)

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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Feb. 17, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]          
Total Principal Amount $ 5,369        
Total Debt       $ 5,424  
Less: current       34  
Total long-term debt 5,238     $ 5,390  
AK Steel          
Debt Instrument [Line Items]          
Total Principal Amount $ 56        
4.875% 2024 Senior Secured Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate       4.875%  
Annual Effective Interest Rate       5.00%  
Total Principal Amount       $ 395  
Unamortized Debt Issuance Costs       (3)  
Unamortized Discounts       (1)  
Total Debt       $ 391  
9.875% 2025 Senior Secured Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate 9.875%     9.875%  
Annual Effective Interest Rate 10.57%     10.57%  
Total Principal Amount $ 607     $ 955  
Unamortized Debt Issuance Costs (4)     (8)  
Unamortized Discounts (13)     (25)  
Total Debt $ 590     $ 922  
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate 6.75%     6.75%  
Annual Effective Interest Rate 6.99%     6.99%  
Total Principal Amount $ 845     $ 845  
Unamortized Debt Issuance Costs (16)     (20)  
Unamortized Discounts (7)     (9)  
Total Debt $ 822     $ 816  
7.625% 2021 AK Senior Notes | AK Steel          
Debt Instrument [Line Items]          
Stated interest rate       7.625%  
Annual Effective Interest Rate       7.33%  
Total Principal Amount       $ 34  
Unamortized Debt Issuance Costs       0  
Unamortized Discounts       0  
Total Debt       $ 34  
7.500% 2023 AK Senior Notes | AK Steel          
Debt Instrument [Line Items]          
Stated interest rate       7.50%  
Annual Effective Interest Rate       6.17%  
Total Principal Amount       $ 13  
Unamortized Debt Issuance Costs       0  
Unamortized Discounts       0  
Total Debt       $ 13  
6.375% 2025 Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate       6.375%  
Annual Effective Interest Rate       8.11%  
Total Principal Amount       $ 64  
Unamortized Debt Issuance Costs       0  
Unamortized Discounts       (4)  
Total Debt       $ 60  
6.375% 2025 AK Senior Notes | AK Steel          
Debt Instrument [Line Items]          
Stated interest rate       6.375%  
Annual Effective Interest Rate       8.11%  
Total Principal Amount       $ 29  
Unamortized Debt Issuance Costs       0  
Unamortized Discounts       (2)  
Total Debt       $ 27  
1.500% 2025 Convertible Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate 1.50%     1.50%  
Annual Effective Interest Rate 6.26%     6.26%  
Total Principal Amount $ 294     $ 296  
Unamortized Debt Issuance Costs (3)     (4)  
Unamortized Discounts (39)     (49)  
Total Debt $ 252     $ 243  
5.750% 2025 Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate       5.75%  
Annual Effective Interest Rate       6.01%  
Total Principal Amount       $ 396  
Unamortized Debt Issuance Costs       (3)  
Unamortized Discounts       (4)  
Total Debt       $ 389  
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate 7.00%     7.00%  
Annual Effective Interest Rate 9.24%     9.24%  
Total Principal Amount $ 73     $ 73  
Unamortized Debt Issuance Costs 0     0  
Unamortized Discounts (7)     (8)  
Total Debt $ 66     $ 65  
7.000% 2027 AK Senior Notes | AK Steel          
Debt Instrument [Line Items]          
Stated interest rate 7.00%     7.00%  
Annual Effective Interest Rate 9.24%     9.24%  
Total Principal Amount $ 56 $ 80   $ 56  
Unamortized Debt Issuance Costs 0     0  
Unamortized Discounts (5)     (6)  
Total Debt $ 51     $ 50  
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate 5.875%     5.875%  
Annual Effective Interest Rate 6.49%     6.49%  
Total Principal Amount $ 556     $ 556 $ 750
Unamortized Debt Issuance Costs (3)     (4)  
Unamortized Discounts (15)     (18)  
Total Debt $ 538     $ 534  
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate 4.625%        
Annual Effective Interest Rate 4.63%        
Total Principal Amount $ 500   $ 500    
Unamortized Debt Issuance Costs (8)        
Unamortized Discounts 0        
Total Debt $ 492        
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate 4.875%        
Annual Effective Interest Rate 4.88%        
Total Principal Amount $ 500   $ 500    
Unamortized Debt Issuance Costs (8)        
Unamortized Discounts 0        
Total Debt $ 492        
6.250% 2040 Senior Notes | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Stated interest rate 6.25%     6.25%  
Annual Effective Interest Rate 6.34%     6.34%  
Total Principal Amount $ 263     $ 263  
Unamortized Debt Issuance Costs (2)     (2)  
Unamortized Discounts (3)     (3)  
Total Debt 258     258  
Industrial Revenue Bonds | AK Steel          
Debt Instrument [Line Items]          
Total Principal Amount 66     92  
Unamortized Debt Issuance Costs 0     0  
Unamortized Premiums 2     2  
Total Debt 68     $ 94  
EDC Revolving Credit Facility | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Annual Effective Interest Rate       3.25%  
Credit facility, maximum borrowing capacity       $ 40  
Credit facility, amount outstanding       $ 18  
ABL Facility          
Debt Instrument [Line Items]          
Credit facility, amount outstanding $ 1,609        
ABL Facility | Cleveland-Cliffs Inc.          
Debt Instrument [Line Items]          
Annual Effective Interest Rate 1.87%     2.15%  
Credit facility, maximum borrowing capacity $ 4,500     $ 3,500  
Credit facility, amount outstanding $ 1,609     $ 1,510