Quarterly report [Sections 13 or 15(d)]

CAPITAL STOCK - Narrative (Details)

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CAPITAL STOCK - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Nov. 01, 2024
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2024
USD ($)
shares
Nov. 01, 2024
$ / 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 $ 608        
Remaining authorized amount of stock repurchase | $   $ 1,400          
Stelco Holdings Inc              
Class of Stock [Line Items]              
Price per share (in dollars per share) | (per share)       $ 60.00 $ 13.27    
Business Acquisition, Shares Exchange Ratio 0.454            
Stock Issued During Period, Shares, Acquisitions 25,900,000            
Stock Issued During Period, Value, Acquisitions | $ $ 343            
Common Stock              
Class of Stock [Line Items]              
Common stock repurchases (shares)   0 30,400,000        
Common Shares in Treasury              
Class of Stock [Line Items]              
Repurchase of common shares | $     $ 608        
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