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Financial risk management - Summary of transfers that do not qualify for derecognition (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Securities at FVTPL |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | ₩ 7,687,437 | ₩ 10,141,306
Bonds sold under repurchase agreements |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | 12,401,078 | 11,007,055
Associated financial liabilities | 14,988,698 | 11,542,956
Financial assets at FVOCI |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | 4,615,372 | 645,888
Securities at amortized cost |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | 87,569 | 199,261
Loans at amortized cost |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | 10,700 | 20,600
Securities loaned |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | 15,961,633 | 14,699,783
Government bonds |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | 14,992,877 | 13,611,571
Financial institutions bonds |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | 408,766 | 607,175
Corporation bonds |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | 519,713 | 465,211
Equity securities |  |
Transfers that do not qualify for derecognition [Line Items] |  |
Transferred financial assets | ₩ 40,277 | ₩ 15,826

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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 liabilities associated with transferred financial assets that are not derecognised in their entirety. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 42D -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_42D_d&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The fair value of transferred financial assets that are not derecognised in their entirety. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 42D -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_42D_d&doctype=Standard -URIDate 2025-03-27 + Details
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