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Equity - Capital stock of the Group (Details) - KRW (₩)
₩ / shares in Units, ₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of classes of share capital [line items]      
Number of authorized shares 1,000,000,000 1,000,000,000  
Ordinary shares      
Disclosure of classes of share capital [line items]      
Par value per share in won ₩ 5,000 [1] ₩ 5,000 ₩ 5,000
Number of shares issued 485,494,934 [1] 503,445,325 512,759,471
Capital stock ₩ 2,695,586 ₩ 2,695,586  
Preferred shares      
Disclosure of classes of share capital [line items]      
Par value per share in won ₩ 0 ₩ 0  
Number of shares issued 0 0  
Capital stock ₩ 274,055 ₩ 274,055  
[1] The proposed dividend is scheduled to be resolved at the general meeting of shareholders on March 26, 2026, and therefore has not been recognized as a distribution to owners during the current period.