Annual report [Section 13 and 15(d), not S-K Item 405]

CAPITAL STOCK - Narrative (Details)

v3.25.4
CAPITAL STOCK - Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Oct. 31, 2025
$ / shares
shares
Nov. 01, 2024
$ / shares
shares
Dec. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Nov. 01, 2024
$ / shares
Apr. 22, 2024
USD ($)
Feb. 10, 2022
USD ($)
Class of Stock [Line Items]                
Authorized amount of stock repurchase | $             $ 1,500 $ 1,000
Repurchase of common shares | $     $ 0 $ 733 $ 152      
Remaining authorized purchase amount | $     $ 1,400          
Shares sold (in shares) 75,000,000              
Price per share of shares sold (in dollars per share) | $ / shares $ 12.69              
Common Stock                
Class of Stock [Line Items]                
Common stock repurchases (in shares)       37,900,000 10,400,000      
Common Shares in Treasury                
Class of Stock [Line Items]                
Repurchase of common shares | $       $ 733        
Stelco Holdings Inc                
Class of Stock [Line Items]                
Share price (in dollars per share) | (per share)   $ 60.00       $ 13.27    
Common stock per share   25,862,021            
Acquisition (in shares)     25,900,000          
Stock Issued During Period, Value, Acquisitions | $     $ 343 $ 343        
Business Acquisition, Shares Exchange Ratio   0.454            
Stelco Holdings Inc | Common Stock                
Class of Stock [Line Items]                
Acquisition (in shares)       25,900,000        
Stelco Holdings Inc | Common Shares in Treasury                
Class of Stock [Line Items]                
Stock Issued During Period, Value, Acquisitions | $       $ 473        
Series B Preferred Stock                
Class of Stock [Line Items]                
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