Quarterly report pursuant to Section 13 or 15(d)

CAPITAL STOCK - Narrative (Details)

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CAPITAL STOCK - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 11, 2021
Dec. 09, 2020
Mar. 31, 2022
Feb. 10, 2022
Dec. 31, 2021
Mar. 31, 2021
Feb. 11, 2021
Class of Stock [Line Items]              
Authorized amount of stock repurchase       $ 1,000      
Common stock repurchases     $ 19        
Common shares, issued (in shares)     531,051,530   506,832,537   20,000,000
Debt Extinguished     $ 360        
Common Stock              
Class of Stock [Line Items]              
Common stock repurchases (shares)     1,000,000        
Common Shares in Treasury              
Class of Stock [Line Items]              
Common stock repurchases     $ 19        
9.875% 2025 Senior Secured Notes              
Class of Stock [Line Items]              
Debt Extinguished $ 322            
Arcelor Mittal              
Class of Stock [Line Items]              
Common shares sold (in shares)             40,000,000
Cleveland-Cliffs Inc. | 9.875% 2025 Senior Secured Notes              
Class of Stock [Line Items]              
Stated interest rate     9.875%     9.875%  
Common Stock              
Class of Stock [Line Items]              
Share price (in dollars per share)             $ 16.12
Common Stock | ArcelorMittal USA              
Class of Stock [Line Items]              
Stock issued during period, shares, acquisitions (in shares)   78,000,000          
Series A Preferred Stock              
Class of Stock [Line Items]              
Preferred stock authorized (in shares)     3,000,000        
Preferred stock outstanding (in shares)     0        
Preferred stock issued (in shares)     0        
Series B Preferred Stock              
Class of Stock [Line Items]              
Preferred stock authorized (in shares)     4,000,000        
Preferred stock outstanding (in shares)     0        
Preferred stock issued (in shares)     0