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Financial risk management - Fair Value measurement of financial assets measured at fair value (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value ₩ 188,424,277 ₩ 176,231,471
Due from banks at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 40,862 35,450
Loans at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 1,415,254 1,879,946
Securities at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 76,597,261 70,231,449
Securities at FVTPL | Debt securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 71,104,192 67,005,824
Securities at FVTPL | Equity securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 4,869,401 3,097,328
Securities at FVTPL | Gold/silver deposits    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 623,668 128,297
Derivative assets    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 7,153,950 10,279,257
Derivative assets | Trading    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 6,536,859 9,576,896
Derivative assets | Hedging    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 617,091 702,361
Securities at FVOCI    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 103,216,950 93,805,369
Securities at FVOCI | Debt securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 101,282,906 92,016,210
Securities at FVOCI | Equity securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 1,934,044 1,789,159
Level 1    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 53,862,040 50,554,491
Level 1 | Securities at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 15,722,584 13,617,190
Level 1 | Securities at FVTPL | Debt securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 12,198,754 11,870,768
Level 1 | Securities at FVTPL | Equity securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 2,900,162 1,618,125
Level 1 | Securities at FVTPL | Gold/silver deposits    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 623,668 128,297
Level 1 | Derivative assets    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 63,896 85,439
Level 1 | Derivative assets | Trading    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 63,896 85,439
Level 1 | Securities at FVOCI    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 38,075,560 36,851,862
Level 1 | Securities at FVOCI | Debt securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 37,077,188 35,984,894
Level 1 | Securities at FVOCI | Equity securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 998,372 866,968
Level 2    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 113,164,135 105,403,285
Level 2 | Due from banks at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 40,862 35,450
Level 2 | Loans at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 506,781 745,412
Level 2 | Securities at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 41,926,088 39,116,466
Level 2 | Securities at FVTPL | Debt securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 41,464,110 39,052,189
Level 2 | Securities at FVTPL | Equity securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 461,978 64,277
Level 2 | Derivative assets    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 6,493,825 9,474,641
Level 2 | Derivative assets | Trading    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 5,876,734 8,772,280
Level 2 | Derivative assets | Hedging    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 617,091 702,361
Level 2 | Securities at FVOCI    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 64,196,579 56,031,316
Level 2 | Securities at FVOCI | Debt securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 64,196,579 56,031,316
Level 3    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 21,398,102 20,273,695
Level 3 | Loans at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 908,473 1,134,534
Level 3 | Securities at FVTPL    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 18,948,589 17,497,793
Level 3 | Securities at FVTPL | Debt securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 17,441,328 16,082,867
Level 3 | Securities at FVTPL | Equity securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 1,507,261 1,414,926
Level 3 | Derivative assets    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 596,229 719,177
Level 3 | Derivative assets | Trading    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 596,229 719,177
Level 3 | Securities at FVOCI    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 944,811 922,191
Level 3 | Securities at FVOCI | Debt securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value 9,139  
Level 3 | Securities at FVOCI | Equity securities    
Fair Value measurement of financial assets measured at fair value [Line Items]    
Carrying value ₩ 935,672 ₩ 922,191