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Hybrid Bonds - Summary of Hybrid Bonds (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Series hybrid bonds ₩ 398,509 ₩ 398,509
Series 3 hybrid bonds [member]    
Type Unsecured subordinated bearer bond  
Issuance date Jun. 05, 2023  
Maturity June 5, 2083  
Annual interest rate(%) 4.95%  
Series hybrid bonds ₩ 400,000 400,000
Issuance costs [Member]    
Series hybrid bonds ₩ (1,491) ₩ (1,491)