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Financial risk management - Credit risk exposures per credit quality of derivative assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of Credit quality of derivative assets [Line Items]    
Derivative assets ₩ 7,153,950 ₩ 10,279,257
Grade 1    
Disclosure of Credit quality of derivative assets [Line Items]    
Derivative assets 6,797,321 9,578,458
Grade 2    
Disclosure of Credit quality of derivative assets [Line Items]    
Derivative assets ₩ 356,629 ₩ 700,799