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Derivatives - Effect of derivatives on statement financial position, statement of comprehensive income, statement of changes in equity (Details) ₩ in Millions, Unit_pure in Millions | 12 Months Ended
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Dec. 31, 2025 KRW (₩) | Dec. 31, 2024 KRW (₩) | Dec. 31, 2023 KRW (₩)
Fair value hedges | Interest rate forward and swap |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Notional values |  | 10,339,461 | 10,347,033 | 10,112,789
Carrying value of assets | [1] | ₩ 45,898 | ₩ 57,685 | ₩ 65,787
Carrying value of liabilities | [1] | 431,007 | 579,563 | 614,219
Changes in fair value in the period |  | ₩ 138,277 | ₩ 42,787 | ₩ 246,594
Fair value hedges | Currency forward |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Notional values |  | 434,282 | 429,939 | 308,117
Carrying value of assets | [1] | ₩ 1,079 | ₩ 0 | ₩ 2,949
Carrying value of liabilities | [1] | 14,708 | 39,395 | 791
Changes in fair value in the period |  | ₩ 14,686 | ₩ (46,382) | ₩ (327)
Fair value hedges | Equity options |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Notional values |  | 0 | 18,750 |
Carrying value of assets | [1] | ₩ 0 |  |
Carrying value of liabilities | [1] | 0 | ₩ 3,941 |
Changes in fair value in the period |  | ₩ 3,941 | ₩ 1,109 |
Cash flow hedges | Currency swap |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Notional values |  | 9,059,478 | 7,993,851 | 4,448,030
Carrying value of assets | [1] | ₩ 521,120 | ₩ 539,015 | ₩ 111,024
Carrying value of liabilities | [1] | 344,888 | 181,413 | 99,093
Changes in fair value in the period |  | ₩ (218,169) | ₩ 314,114 | ₩ (21,649)
Cash flow hedges | Interest rate forward and swap |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Notional values |  | 3,273,296 | 2,872,383 | 2,356,791
Carrying value of assets | [1] | ₩ 31,076 | ₩ 93,562 | ₩ 53,830
Carrying value of liabilities | [1] | 196,244 | 44,139 | 90,676
Changes in fair value in the period |  | ₩ (214,598) | ₩ 60,694 | ₩ 99,442
Cash flow hedges | Currency forward |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Notional values |  | 1,898,541 | 1,723,440 | 1,150,734
Carrying value of assets | [1] | ₩ 1,104 | ₩ 2,087 | ₩ 12,593
Carrying value of liabilities | [1] | 161,596 | 138,694 | 30,925
Changes in fair value in the period |  | ₩ 34,038 | ₩ (104,727) | ₩ 2,170
Hedge of Net Investment | Currency forward |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Notional values |  | 1,380,935 | 2,191,770 | 683,382
Carrying value of assets | [1] | ₩ 16,814 | ₩ 10,013 | ₩ 6,038
Carrying value of liabilities | [1] | 0 | 34,926 | 2,776
Changes in fair value in the period |  | ₩ 51,154 | ₩ (41,071) | ₩ 4,537
Hedge of Net Investment | Borrowings |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Notional values |  | 1,895,100 | 1,852,212 | 1,466,795
Carrying value of assets | [1] | ₩ 0 | ₩ 0 | ₩ 0
Carrying value of liabilities | [1] | 1,891,783 | 1,848,316 | 1,462,329
Changes in fair value in the period |  | ₩ 29,364 | ₩ (181,341) | ₩ (4,767)
[1] | The related account categories are presented as interest rate swap assets / liabilities and currency forward assets / liabilities etc.

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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 gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 60 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_60_c&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 60 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_60_c&doctype=Standard -URIDate 2025-03-27 + Details
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