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
Sep. 30, 2021
Dec. 31, 2020
Apr. 24, 2020
Mar. 13, 2020
Debt Instrument [Line Items]        
Total Principal Amount $ 5,514      
Long-term Debt   $ 5,424    
Debt, Long-term and Short-term, Combined Amount 5,376      
Long-term Debt, Current Maturities 26 34    
Total long-term debt 5,350 $ 5,390    
ABL Facility        
Debt Instrument [Line Items]        
Long-term Line of Credit 1,673      
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 55 $ 18    
Maximum borrowing capacity 80 $ 40    
Cleveland-Cliffs Inc. | ABL 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% 9.875%  
Annual Effective Interest Rate 10.57% 10.57%    
Total Principal Amount $ 607 $ 955    
Unamortized Debt Issuance Costs (4) (8)    
Unamortized (Discounts) (14) (25)    
Long-term Debt $ 589 $ 922    
Cleveland-Cliffs Inc. | 6.750% 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 (16) (20)    
Unamortized (Discounts) (8) (9)    
Long-term Debt $ 821 $ 816    
Cleveland-Cliffs Inc. | 1.500% 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 $ 294 $ 296    
Unamortized Debt Issuance Costs (3) (4)    
Unamortized (Discounts) (42) (49)    
Long-term Debt $ 249 $ 243    
Cleveland-Cliffs Inc. | 7.000% 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) (16) (18)    
Long-term Debt $ 536 $ 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      
Unamortized Debt Issuance Costs (8)      
Unamortized (Discounts) 0      
Long-term Debt $ 492      
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      
Unamortized Debt Issuance Costs (8)      
Unamortized (Discounts) 0      
Long-term Debt $ 492      
Cleveland-Cliffs Inc. | 6.250% 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. | ABL Facility        
Debt Instrument [Line Items]        
Annual Effective Interest Rate 2.23%      
Long-term Line of Credit $ 1,673 $ 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    
Cleveland-Cliffs Inc. | 5.750% 2025 Senior Notes        
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)    
Long-term Debt   389    
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 | Industrial Revenue Bonds due 2024        
Debt Instrument [Line Items]        
Long-term Debt, Current Maturities $ 26      
AK Steel | 7.000% 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) (5) (6)    
Long-term Debt 51 $ 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 | 7.500% 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