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Financial risk management - Maximum exposure to credit risk (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk ₩ 1,005,061,068 ₩ 956,791,920
Due from banks and loans at amortized cost    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1],[2] 501,633,507 487,523,988
Due from banks and loans at amortized cost | Retail    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1],[2] 208,308,298 199,809,576
Due from banks and loans at amortized cost | Government/Public sector/ Central bank    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1],[2] 26,417,332 27,228,308
Due from banks and loans at amortized cost | Corporations    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1],[2] 226,554,125 218,713,457
Deposits and loans at FVTPL    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1] 1,456,116 1,915,396
Deposits and loans at FVTPL | Corporations    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1] 1,286,144 1,780,787
Securities at FVTPL    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk 71,727,860 67,134,121
Securities at FVOCI    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk 101,282,906 92,016,210
Securities at amortized cost    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [2] 31,944,368 33,315,999
Derivative assets    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk 7,153,950 10,279,257
Other financial assets    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [2],[3] 43,323,340 23,116,960
Guarantee contracts    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk 26,221,968 22,509,195
Loan commitments and other credit liabilities    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk 220,317,053 218,980,794
Banks | Due from banks and loans at amortized cost    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1],[2] 12,658,709 14,058,051
Banks | Deposits and loans at FVTPL    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1] 169,972 134,609
Card receivable | Due from banks and loans at amortized cost    
Maximum exposure to credit risk [Line Items]    
Maximum exposure to credit risk [1],[2] ₩ 27,695,043 ₩ 27,714,596
[1] Classified as similar credit risk group based on calculation of the BIS ratio under new Basel Capital Accord (Basel III).
[2] The maximum exposure amounts for due from banks, loans, securities at amortized cost and other financial assets at amortized cost are the net carrying amount after deducting the allowance for credit losses.
[3] Other financial assets mainly comprise of accounts receivable, accrued income, deposits, domestic exchange settlement debit and suspense payments.