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Securities at fair value through other comprehensive income and securities at amortized cost - Income or loss on equity securities at fair value through other comprehensive income (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Income or loss on equity securities at fair value through other comprehensive income [Line Items] |  |
Fair value at the date of disposal | ₩ 156,691 | ₩ 109,833
Cumulative net gain at the time of disposal | 4,478 | 9,434
Stocks [Member] |  |
Income or loss on equity securities at fair value through other comprehensive income [Line Items] |  |
Fair value at the date of disposal | 155,004 | 106,810
Cumulative net gain at the time of disposal | 4,467 | 9,429
Contingent Convertible Bonds [Member] |  |
Income or loss on equity securities at fair value through other comprehensive income [Line Items] |  |
Fair value at the date of disposal | 1,687 | 3,023
Cumulative net gain at the time of disposal | ₩ 11 | ₩ 5

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- Definition The cumulative gain (loss) on disposal of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 11B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_11B_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The fair value at the date of the derecognition of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Investments in equity instruments designated at fair value through other comprehensive income [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 11B -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_11B_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Details
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