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

CAPITAL STOCK - Narrative (Details)

v3.25.0.1
CAPITAL STOCK - Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Nov. 01, 2024
$ / shares
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
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 | $   $ 733 $ 152 $ 240      
Remaining authorized purchase amount | $   $ 1,400          
Common Stock              
Class of Stock [Line Items]              
Common stock repurchases (in shares)   37,900,000 10,400,000 12,500,000      
Common Shares in Treasury              
Class of Stock [Line Items]              
Repurchase of common shares | $   $ 733 $ 152        
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)   25.9          
Stock Issued During Period, Value, Acquisitions | $   $ 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