v3.26.1
Treasury Shares - Summary of Changes in Treasury Shares (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of Changes in treasury shares [Line Items]      
Increase (decrease) through treasury share transactions, equity     ₩ 265,120
Payment to acquire treasury shares   ₩ 15,788 ₩ 285,487
Number of Treasury shares Retired 0 4,043,091  
Bonus payment to employees [Member]      
Disclosure of Changes in treasury shares [Line Items]      
Distribution of treasury shares 4,860 503,612  
Proceeds from sale or issue of treasury shares ₩ 238 ₩ 24,807  
Gain loss on disposal treasury share 24 ₩ 181  
Exercise Of Stock Option [Member]      
Disclosure of Changes in treasury shares [Line Items]      
Increase (decrease) through treasury share transactions, equity 4,191    
Gain loss on disposal treasury share ₩ 1,164    
Treasury Shares Granted 91,073    
Kako Co Ltd [Member]      
Disclosure of Changes in treasury shares [Line Items]      
Number of share acquired   317,000  
Payment to acquire treasury shares   ₩ 15,788