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Hybrid Bonds - Summary of Hybrid Bonds (Detail) - Hybrid bond 1-2 [member] - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2025
Disclosure of detailed information about borrowings [line items]    
Date of issue Dec. 18, 2024  
Date of maturity Dec. 18, 2054  
Interest rate (%) 4.64% 4.64%
Gross amount [member]    
Disclosure of detailed information about borrowings [line items]    
Hybrid bonds classified as equity ₩ 600,000 ₩ 600,000