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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