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Derivatives - Notional amounts of derivatives (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | ₩ 547,997,163 | ₩ 480,094,055
Trading purpose | Interest Rates Related | Over the counter |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 66,773,009 | 57,994,398
Trading purpose | Interest Rates Related | Over the counter | Interest Rate Option |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 926,000 | 825,057
Trading purpose | Interest Rates Related | Over the counter | Interest rate forwards and swaps |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 65,847,009 | 57,169,341
Trading purpose | Foreign currency related |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 260,467,828 | 231,164,037
Trading purpose | Foreign currency related | Over the counter |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 258,485,272 | 229,629,273
Trading purpose | Foreign currency related | Over the counter | Currency forward |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 186,552,883 | 167,805,176
Trading purpose | Foreign currency related | Over the counter | Currency swap |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 68,522,136 | 59,641,567
Trading purpose | Foreign currency related | Over the counter | Currency options |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 3,410,253 | 2,182,530
Trading purpose | Foreign currency related | Exchange traded | Currency futures |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 1,982,556 | 1,534,764
Trading purpose | Interest rates related |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 246,328,584 | 205,064,890
Trading purpose | Interest rates related | Exchange traded |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 179,555,575 | 147,070,492
Trading purpose | Interest rates related | Exchange traded | Interest rate swap contract |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives | [1] | 175,593,544 | 142,194,805
Trading purpose | Interest rates related | Exchange traded | Interest Rate Future |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 3,962,031 | 4,875,687
Trading purpose | Credit related | Over the counter |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 5,921,861 | 5,041,093
Trading purpose | Credit related | Over the counter | Credit Swaps |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 5,079,897 | 4,231,106
Trading purpose | Credit related | Over the counter | Total return swaps |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 841,964 | 809,987
Trading purpose | Equity related |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 6,945,470 | 10,952,283
Trading purpose | Equity related | Over the counter |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 5,095,229 | 8,899,619
Trading purpose | Equity related | Over the counter | Equity Swaps And Forwards |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 2,811,480 | 5,975,657
Trading purpose | Equity related | Over the counter | Equity Options |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 2,283,749 | 2,923,962
Trading purpose | Equity related | Exchange traded |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 1,850,241 | 2,052,664
Trading purpose | Equity related | Exchange traded | Equity Options |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 492,549 | 452,322
Trading purpose | Equity related | Exchange traded | Equity Futures |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 1,357,692 | 1,600,342
Trading purpose | Commodity related |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 1,947,425 | 2,294,585
Trading purpose | Commodity related | Over the counter | Commodity Swaps And Forwards |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 1,698,190 | 2,121,686
Trading purpose | Commodity related | Exchange traded | Commodity Futures |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 249,235 | 172,899
Hedging purpose |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 26,385,995 | 25,577,167
Hedging purpose | Foreign currency related | Currency forward |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 3,713,759 | 4,345,149
Hedging purpose | Foreign currency related | Currency swap |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 9,059,479 | 7,993,851
Hedging purpose | Foreign currency related | Equity Options |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | 0 | 18,750
Hedging purpose | Foreign currency related | Interest rate forwards and swaps |  |  |
Notional amounts of derivatives [Line Items] |  |  |
Notional amounts of derivatives |  | ₩ 13,612,757 | ₩ 13,219,417
[1] | The notional amounts of derivatives outstanding that are to be settled in the ‘Central Counter Party (CCP)’system.

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