Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES - Debt Extinguishments (Details)

v3.22.0.1
DEBT AND CREDIT FACILITIES - Debt Extinguishments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 18, 2022
Oct. 15, 2021
Mar. 12, 2021
Mar. 11, 2021
Apr. 24, 2020
Mar. 27, 2020
Mar. 13, 2020
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 11, 2021
Extinguishment of Debt [Line Items]                            
Repayments under credit facilities                     $ 5,889 $ 550 $ 0  
Total Principal Amount               $ 5,369     5,369      
Debt Extinguished         $ 736           $ 1,306 $ 1,513 724  
Common shares, issued (in shares)               506,832,537     506,832,537 506,832,537   20,000,000
Gain (loss) on extinguishment of debt                     $ (88) $ 130 (18)  
Reduction of Principal Long-Term Debt         $ 181                  
AK Steel                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount               $ 56     56      
Senior notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                       35    
Industrial Revenue Bonds | AK Steel                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                       7    
EDC Revolving Credit Facility                            
Extinguishment of Debt [Line Items]                            
Repayments under credit facilities               55            
Industrial Revenue Bonds                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished   $ 26                 26      
Gain (loss) on extinguishment of debt                     0      
Industrial Revenue Bonds | AK Steel                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount               66     66 92    
1.500% 2025 Convertible Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                 $ 2   2 20    
Gain (loss) on extinguishment of debt                     0 1    
1.500% 2025 Convertible Senior Notes | Subsequent Event                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished $ 294                          
1.500% 2025 Convertible Senior Notes | Cleveland-Cliffs Inc.                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount               294     294 296    
5.750% 2025 Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                   $ 396 396 77 600  
Gain (loss) on extinguishment of debt                     (17) 16 (13)  
5.750% 2025 Senior Notes | Cleveland-Cliffs Inc.                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount                       396    
9.875% 2025 Senior Secured Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished       $ 322           $ 25 347      
Gain (loss) on extinguishment of debt                     (47)      
9.875% 2025 Senior Secured Notes | Cleveland-Cliffs Inc.                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount               607     607 955    
Senior notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished     $ 535                      
4.875% 2024 Senior Secured Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                     395 6    
Gain (loss) on extinguishment of debt                     (14) 1    
4.875% 2024 Senior Secured Notes | Cleveland-Cliffs Inc.                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount                       395    
7.625% 2021 AK Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished           $ 9 $ 364       34 373    
Gain (loss) on extinguishment of debt                     0 0    
7.625% 2021 AK Senior Notes | AK Steel                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount                       34    
7.500% 2023 AK Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished           $ 56 $ 311       13 367    
Gain (loss) on extinguishment of debt                     0 3    
7.500% 2023 AK Senior Notes | AK Steel                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount                       13    
6.375% 2025 Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                     64 168    
Gain (loss) on extinguishment of debt                     (7) 21    
6.375% 2025 Senior Notes | Cleveland-Cliffs Inc.                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount                       64    
6.375% 2025 AK Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                     29 9    
Gain (loss) on extinguishment of debt                     (3) (1)    
6.375% 2025 AK Senior Notes | AK Steel                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount                       29    
7.000% 2027 Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                       262    
Gain (loss) on extinguishment of debt                       27    
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc.                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount               73     73 73    
5.875% 2027 Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                       195    
Gain (loss) on extinguishment of debt                       49    
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc.                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount               556     556 556 750  
6.250% 2040 Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                       36    
Gain (loss) on extinguishment of debt                       13    
6.250% 2040 Senior Notes | Cleveland-Cliffs Inc.                            
Extinguishment of Debt [Line Items]                            
Total Principal Amount               $ 263     $ 263 $ 263    
4.875% 2021 Senior Notes                            
Extinguishment of Debt [Line Items]                            
Debt Extinguished                         124  
Gain (loss) on extinguishment of debt                         $ (5)