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Net other operating income and expenses - Summary of Other operating income and expenses (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Other operating income |  |  |  |
Loans at amortized cost |  | ₩ 249,842 | ₩ 206,643 | ₩ 178,158
Miscellaneous other operating income |  |  |  |
Gain on hedged items |  | 607,993 | 753,798 | 422,074
Reversal of allowance for guarantees and acceptances |  | 0 | 8,471 | 4,856
Gain on other trust accounts |  | 0 | 0 | 2
Reversal of other allowance |  | 1,086 | 8,022 | 1,790
Others |  | 747,904 | 750,170 | 547,573
Miscellaneous other operating income |  | 1,356,983 | 1,520,461 | 976,295
Other operating income |  | 1,606,825 | 1,727,104 | 1,154,453
Other operating expense |  |  |  |
Loans at amortized cost |  | (161,910) | (97,821) | (19,723)
Miscellaneous other operating expense |  |  |  |
Loss on hedged items |  | (753,529) | (626,116) | (448,664)
Fund contribution |  | (559,455) | (526,196) | (470,227)
Provision for payment guarantee liabilities |  | (404) | 0 | 0
Provision for other debt allowances |  | (35,164) | (98,344) | (15,516)
Depreciation of operating lease assets |  | (445,157) | (465,716) | (445,006)
Others | [1] | (1,977,199) | (1,979,135) | (1,942,047)
Miscellaneous other operating expense |  | (3,770,908) | (3,695,507) | (3,321,460)
Other operating expense |  | (3,932,818) | (3,793,328) | (3,341,183)
Other operating expenses, net |  | ₩ (2,325,993) | ₩ (2,066,224) | ₩ (2,186,730)
[1] | Includes W293,824 million for vulnerable groups such as self-employed people, small business owners and institutions supporting vulnerable groups, etc. in accordance with the “Banking financial support plan for people’s livelihood” for the year ended December 31, 2023.

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