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Financial risk management - Maximum exposure to credit risk (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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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.

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2025-03-27 + Details
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