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Derivatives - Notional amounts of derivatives (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
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.