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Derivatives - Gain or loss on valuation of derivatives (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives ₩ 245,952 ₩ 324,563 ₩ 619,499
Exchange traded      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 41,714 (43,907) (143,178)
Foreign Currency Related | Over the counter      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 252,056 (429) 173,957
Foreign Currency Related | Over the counter | Currency forward      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 273,413 1,734,704 36,890
Foreign Currency Related | Over the counter | Currency swap      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives (28,745) (1,739,525) 135,712
Foreign Currency Related | Over the counter | Currency options      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 7,388 4,392 1,355
Foreign Currency Related | Exchange traded      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 248,798 375 173,002
Foreign Currency Related | Exchange traded | Currency futures      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives (3,258) 804 (955)
Interest Rates Related | Over the counter      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 189,315 112,821 179,101
Interest Rates Related | Over the counter | Interest rate options      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 1,476 (2,413) (2,886)
Interest Rates Related | Over the counter | Interest rate forwards and swaps      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 187,839 115,234 181,987
Interest Rates Related | Exchange traded      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 189,467 115,074 169,590
Interest Rates Related | Exchange traded | Interest rate futures and others      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 152 2,253 (9,511)
Credit Related | Over the counter      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 4,405 44,223 53,042
Credit Related | Over the counter | Credit Swaps      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives (5,507) 44,223 53,042
Credit Related | Over the counter | Total return swaps      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 9,912    
Equity Related | Over the counter      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 36,815 (32,899) (179,258)
Equity Related | Over the counter | Equity Options      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 6,807 28,708 (159,324)
Equity Related | Over the counter | Equity Swaps And Forwards      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 30,008 (61,607) (19,934)
Equity Related | Exchange traded | Equity Options      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives (5,036) 1,085 (13,929)
Equity Related | Exchange traded | Equity Futures      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 9,935 (12,093) 50,009
Commodity Related | Over the counter      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 26,502 (43,643) 38,543
Commodity Related | Over the counter | Commodity swaps and forwards      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 26,502 (43,643) 37,027
Commodity Related | Over the counter | Commodity options      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 0 0 1,516
Commodity Related | Exchange traded      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives 26,140 (33,581) 40,027
Commodity Related | Exchange traded | Commodity futures      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives (362) 10,062 1,484
Hedge Funds      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives (264,572) 242,379 327,016
Trading purpose | Equity related | Exchange traded      
Gain or loss on valuation of derivatives [Line Items]      
Gain or loss on valuation of derivatives ₩ 4,899 ₩ (11,008) ₩ 36,080