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Securities at fair value through other comprehensive income and securities at amortized cost - Gain or loss on disposal of securities at fair value through other comprehensive income and securities at amortized cost (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Gain or loss on disposal of financial assets at fair value through other comprehensive income and securities at amortized cost [Abstract] |  |  |  |
Gain on disposal of securities at FVOCI |  | ₩ 287,564 | ₩ 197,708 | ₩ 50,793
Loss on disposal of securities at FVOCI |  | (93,952) | (137,448) | (180,368)
Gain on disposal of securities at amortized cost | [1] | 2 | 0 | 358
Loss on disposal of securities at amortized cost | [1] | (58) | (23,155) | (107)
Total |  | ₩ 193,556 | ₩ 37,105 | ₩ (129,324)
[1] | The disposal of securities measured at amortized cost was driven by the exercise of early redemption options by the issuers and by the objective of securing additional asset duration for asset-liability management in response to changes in the interest rate environment.

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- Definition The gain, recognised in the statement of comprehensive income, that arises from the derecognition of financial assets measured at amortised cost. [Refer: Financial assets at amortised cost] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 20A -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_20A&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The loss recognised in the statement of comprehensive income arising from the derecognition of financial assets measured at amortised cost. [Refer: Financial assets at amortised cost] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 20A -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_20A&doctype=Standard -URIDate 2025-03-27 + Details
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