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Financial risk management - Recognized profit or loss of the changes in carrying value of financial instruments classified as Level 3 (Details) - Level 3 - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Recognized profit or loss of the changes in carrying value of financial instruments classified as Level 3 [Line Items] |  |
Amounts recognized in profit or loss | ₩ 70,943 | ₩ 53,858
Recognized profit or loss from the financial instruments held as of December 31 | 289,004 | 563,393
Net gain on financial assets at FVTPL |  |
Recognized profit or loss of the changes in carrying value of financial instruments classified as Level 3 [Line Items] |  |
Amounts recognized in profit or loss | 259,966 | 112,040
Recognized profit or loss from the financial instruments held as of December 31 | 250,113 | 443,935
Net gain (loss) on financial liabilities designated at FVTPL |  |
Recognized profit or loss of the changes in carrying value of financial instruments classified as Level 3 [Line Items] |  |
Amounts recognized in profit or loss | (225,030) | (74,680)
Recognized profit or loss from the financial instruments held as of December 31 | 2,884 | 102,961
Net other operating income |  |
Recognized profit or loss of the changes in carrying value of financial instruments classified as Level 3 [Line Items] |  |
Amounts recognized in profit or loss | 36,007 | 16,498
Recognized profit or loss from the financial instruments held as of December 31 | ₩ 36,007 | ₩ 16,497

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