Annual report pursuant to Section 13 and 15(d)

CAPITAL STOCK - Narrative (Details)

v3.24.0.1
CAPITAL STOCK - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 01, 2021
Mar. 11, 2021
Dec. 09, 2020
Sep. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Feb. 10, 2022
Apr. 29, 2021
Mar. 31, 2021
Feb. 11, 2021
Dec. 31, 2020
Class of Stock [Line Items]                        
Authorized amount of stock repurchase               $ 1,000        
Repurchase of common shares         $ 152 $ 240 $ 0          
Remaining authorized purchase amount         $ 608              
1.500% 2025 Convertible Senior Notes redemption           $ (25) $ (5)          
Common shares, issued (in shares)         531,051,530 531,051,530         20,000,000  
Common shares, sold (in shares)                     40,000,000  
Common stock, shares issued, price per share (in usd per share)                     $ 16.12  
Redeemable preferred stock, issued (in shares)                       583,273
Redeemable preferred stock, outstanding (in shares)                       583,273
Common shares, authorized (in shares)         1,200,000,000 1,200,000,000     1,200,000,000 600,000,000    
Common Stock                        
Class of Stock [Line Items]                        
Common stock repurchases (in shares)         10,400,000 12,500,000            
1.500% 2025 Convertible Senior Notes redemption (in shares)           24,200,000            
Common Shares in Treasury                        
Class of Stock [Line Items]                        
Repurchase of common shares         $ 152              
1.500% 2025 Convertible Senior Notes                        
Class of Stock [Line Items]                        
Redemption of debt $ 294                      
Repayments of debt 294                      
1.500% 2025 Convertible Senior Notes redemption $ 499                      
9.875% 2025 Senior Secured Notes                        
Class of Stock [Line Items]                        
Redemption of debt   $ 322                    
ArcelorMittal                        
Class of Stock [Line Items]                        
Common shares, sold (in shares)                     40,000,000  
Common Stock                        
Class of Stock [Line Items]                        
1.500% 2025 Convertible Senior Notes redemption (in shares) 24,000,000                      
Common Stock | ArcelorMittal USA                        
Class of Stock [Line Items]                        
Acquisition (in shares)     78,000,000                  
Series B Preferred Stock                        
Class of Stock [Line Items]                        
Stock redeemed during period (in shares)       583,273                
Stock redeemed during period       $ 1,300                
Preferred stock authorized (in shares)         4,000,000              
Preferred stock issued (in shares)         0              
Preferred stock outstanding (in shares)         0              
Series A Preferred Stock                        
Class of Stock [Line Items]                        
Preferred stock authorized (in shares)         3,000,000              
Preferred stock issued (in shares)         0              
Preferred stock outstanding (in shares)         0