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Derivatives - Fair values of derivative instruments (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative Fair Value [Line Items] |  |
Derivative assets | ₩ 7,153,950 | ₩ 10,279,257
Derivative liabilities | 7,020,846 | 10,058,532
Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 102,997 | 259,419
Derivative liabilities | 91,478 | 267,063
Interest Rates Related | Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 819,038 | 738,370
Derivative liabilities | 785,008 | 888,984
Credit Related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 499,112 | 507,677
Derivative liabilities | 13,697 | 9,764
Equity Related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 49,001 | 192,014
Derivative liabilities | 65,980 | 249,487
Commodity Related | Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 19,232 | 14,618
Derivative liabilities | 119,404 | 133,475
Hedge Funds |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 617,091 | 702,361
Derivative liabilities | 1,148,443 | 1,022,071
Currency forward | Hedge Funds |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 18,997 | 12,100
Derivative liabilities | 176,304 | 213,015
Currency swap | Hedge Funds |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 521,120 | 539,015
Derivative liabilities | 344,888 | 181,413
Interest Rate Future | Interest Rates Related | Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 1,605 | 2,929
Derivative liabilities | 808 | 675
Credit Swaps | Credit Related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 40,643 | 40,325
Derivative liabilities | 7,187 | 5,208
Total return swaps | Credit Related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 458,469 | 467,352
Derivative liabilities | 6,510 | 4,556
Equity Swaps And Forwards | Equity Related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 43,121 | 96,841
Derivative liabilities | 48,500 | 137,399
Equity Options | Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 43,595 | 66,177
Derivative liabilities | 24,835 | 4,274
Equity Options | Equity Related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 5,880 | 95,173
Derivative liabilities | 17,480 | 112,088
Equity Options | Hedge Funds |  |
Derivative Fair Value [Line Items] |  |
Derivative liabilities |  | 3,941
Equity Futures | Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 10,401 | 1,228
Derivative liabilities | 663 | 13,302
Commodity Swaps And Forwards | Commodity Related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 11,044 | 914
Derivative liabilities | 110,854 | 129,833
Commodity Futures | Commodity Related | Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 8,188 | 13,704
Derivative liabilities | 8,550 | 3,642
Interest rate forwards and swaps | Hedge Funds |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 76,974 | 151,246
Derivative liabilities | 627,251 | 623,702
Trading purpose | Foreign currency related |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 5,096,480 | 8,056,812
Derivative liabilities | 4,862,816 | 7,737,175
Trading purpose | Foreign currency related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 5,096,373 | 8,055,285
Derivative liabilities | 4,859,451 | 7,736,347
Trading purpose | Foreign currency related | Currency forward | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 3,384,263 | 5,731,971
Derivative liabilities | 2,215,089 | 3,887,398
Trading purpose | Foreign currency related | Currency swap | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 1,703,067 | 2,299,084
Derivative liabilities | 2,625,865 | 3,823,249
Trading purpose | Foreign currency related | Currency futures | Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 107 | 1,527
Derivative liabilities | 3,365 | 828
Trading purpose | Foreign currency related | Currency options | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 9,043 | 24,230
Derivative liabilities | 18,497 | 25,700
Trading purpose | Interest rates related | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 817,433 | 735,441
Derivative liabilities | 784,200 | 888,309
Trading purpose | Interest rates related | Interest Rate Option | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 0 | 1,157
Derivative liabilities | 29,468 | 28,907
Trading purpose | Interest rates related | Interest rate forwards and swaps | Over the counter |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 817,433 | 734,284
Derivative liabilities | 754,732 | 859,402
Trading purpose | Equity related | Exchange traded |  |
Derivative Fair Value [Line Items] |  |
Derivative assets | 53,996 | 67,405
Derivative liabilities | ₩ 25,498 | ₩ 17,576

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