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Treasury Shares (Tables)
12 Months Ended
Dec. 31, 2025
TextBlock 1 [Abstract]  
Changes in Treasury Shares
(shares, in millions of Won)
  
2024
    
2025
 
    
Number of shares
    
Amount
    
Number of shares
    
Amount
 
Beginning
     8,695,023     
1,889,658        7,003,598     
1,550,862  
Acquisition of treasury shares
     255,428        92,311        —         —   
Retirement of treasury shares
     (1,946,853      (431,107      (1,691,425      (374,546
  
 
 
    
 
 
    
 
 
    
 
 
 
Ending
     7,003,598     
1,550,862        5,312,173     
1,176,316