Quarterly report pursuant to Section 13 or 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
Mar. 31, 2021
Feb. 17, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Total Principal Amount $ 5,893    
Long-term Debt     $ 5,424
Long-term Debt, Current Maturities     34
Total long-term debt 5,734   $ 5,390
ABC Facility      
Debt Instrument [Line Items]      
Long-term Line of Credit 1,630    
Maximum borrowing capacity 3,500    
Cleveland-Cliffs Inc.      
Debt Instrument [Line Items]      
Annual Effective Interest Rate     3.25%
Cleveland-Cliffs Inc. | EDC Revolving Facilities - outstanding balance      
Debt Instrument [Line Items]      
Long-term Line of Credit 53   $ 18
Maximum borrowing capacity 80   $ 40
Cleveland-Cliffs Inc. | ABC Facility      
Debt Instrument [Line Items]      
Annual Effective Interest Rate     2.15%
Maximum borrowing capacity $ 3,500   $ 3,500
Cleveland-Cliffs Inc. | 9.875% 2025 Senior Secured Notes      
Debt Instrument [Line Items]      
Stated interest rate 9.875%   9.875%
Annual Effective Interest Rate 10.57%   10.57%
Total Principal Amount $ 633   $ 955
Unamortized Debt Issuance Costs (5)   (8)
Unamortized (Discounts) (16)   (25)
Long-term Debt $ 612   $ 922
Cleveland-Cliffs Inc. | 6.75% 2026 Senior Secured Notes      
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 (19)   (20)
Unamortized (Discounts) (8)   (9)
Long-term Debt $ 818   $ 816
Cleveland-Cliffs Inc. | 1.50% 2025 Convertible Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate 1.50%   1.50%
Annual Effective Interest Rate 6.26%   6.26%
Total Principal Amount $ 296   $ 296
Unamortized Debt Issuance Costs (3)   (4)
Unamortized (Discounts) (47)   (49)
Long-term Debt $ 246   $ 243
Cleveland-Cliffs Inc. | 5.75% 2025 Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate 5.75%   5.75%
Annual Effective Interest Rate 6.01%   6.01%
Total Principal Amount $ 396   $ 396
Unamortized Debt Issuance Costs (2)   (3)
Unamortized (Discounts) (4)   (4)
Long-term Debt $ 390   $ 389
Cleveland-Cliffs Inc. | 7.00% 2027 Senior Notes      
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)
Long-term Debt $ 66   $ 65
Cleveland-Cliffs Inc. | 5.875% 2027 Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate 5.875%   5.875%
Annual Effective Interest Rate 6.49%   6.49%
Total Principal Amount $ 556   $ 556
Unamortized Debt Issuance Costs (4)   (4)
Unamortized (Discounts) (17)   (18)
Long-term Debt $ 535   $ 534
Cleveland-Cliffs Inc. | 4.625% 2029 Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate 4.625%    
Annual Effective Interest Rate 4.63%    
Total Principal Amount $ 500 $ 500  
Unamortized Debt Issuance Costs (9)    
Unamortized (Discounts) 0    
Long-term Debt $ 491    
Cleveland-Cliffs Inc. | 4.875% 2031 Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate 4.875%    
Annual Effective Interest Rate 4.88%    
Total Principal Amount $ 500 $ 500  
Unamortized Debt Issuance Costs (9)    
Unamortized (Discounts) 0    
Long-term Debt $ 491    
Cleveland-Cliffs Inc. | 6.25% 2040 Senior Notes      
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)
Long-term Debt $ 258   258
Cleveland-Cliffs Inc. | ABC Facility      
Debt Instrument [Line Items]      
Annual Effective Interest Rate 2.14%    
Long-term Line of Credit $ 1,630   $ 1,510
Cleveland-Cliffs Inc. | 4.875% 2024 Senior Notes      
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)
Long-term Debt     $ 391
Cleveland-Cliffs Inc. | 6.375% 2025 Senior Notes      
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)
Long-term Debt     60
AK Steel | Industrial Revenue Bonds      
Debt Instrument [Line Items]      
Total Principal Amount     92
Unamortized Debt Issuance Costs     0
Unamortized Premiums     2
Long-term Debt     $ 94
AK Steel | 7.00% 2027 AK Senior Notes      
Debt Instrument [Line Items]      
Stated interest rate 7.00%   7.00%
Annual Effective Interest Rate 9.24%   9.24%
Total Principal Amount $ 56   $ 56
Unamortized Debt Issuance Costs 0   0
Unamortized (Discounts) (6)   (6)
Long-term Debt 50   $ 50
AK Steel | Industrial Revenue Bonds      
Debt Instrument [Line Items]      
Total Principal Amount 92    
Unamortized Debt Issuance Costs 0    
Unamortized Premiums 2    
Long-term Debt $ 94    
AK Steel | 7.625% 2021 AK Senior Notes      
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
Long-term Debt     $ 34
AK Steel | 7.50% Senior Secured Notes due July 2023      
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
Long-term Debt     $ 13
AK Steel | 6.375% 2025 AK Senior Notes      
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)
Long-term Debt     $ 27