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Financial risk management - Changes in gains or losses on valuation at the transaction date (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss [abstract]    
Beginning balance ₩ (89,230) ₩ (81,747)
New transactions (40,646) (33,712)
Recognized in profit for the year 40,199 26,229
Ending balance ₩ (89,677) ₩ (89,230)