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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
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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

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 + Details
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