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Liability under insurance contracts and reinsurance contracts - Summary of insurance contract liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | ₩ (760) | ₩ (5,639)
Insurance contract liabilities | 50,471,303 | 51,124,991
Net insurance contract liabilities (assets) | 50,470,543 | 51,119,352
Reinsurance contract assets | 603,442 | 184,754
Reinsurance contract liabilities | (56,378) | (98,063)
Total net reinsurance contract assets (liabilities) | 547,064 | 86,691
Death [member] |  |
Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | 0 | 0
Insurance contract liabilities | 20,174,773 | 20,021,186
Net insurance contract liabilities (assets) | 20,174,773 | 20,021,186
Reinsurance contract assets | 0 | 0
Reinsurance contract liabilities | (24,641) | (26,214)
Total net reinsurance contract assets (liabilities) | (24,641) | (26,214)
Health [member] |  |
Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | 0 | 0
Insurance contract liabilities | 5,081,797 | 5,556,614
Net insurance contract liabilities (assets) | 5,081,797 | 5,556,614
Reinsurance contract assets | 0 | 0
Reinsurance contract liabilities | (31,737) | (71,844)
Total net reinsurance contract assets (liabilities) | (31,737) | (71,844)
Pension Savings [member] |  |
Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | 0 | 0
Insurance contract liabilities | 19,060,216 | 20,227,829
Net insurance contract liabilities (assets) | 19,060,216 | 20,227,829
Reinsurance contract assets | 0 | 0
Reinsurance contract liabilities | 0 | 0
Total net reinsurance contract assets (liabilities) | 0 | 0
Variable [member] |  |
Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | 0 | 0
Insurance contract liabilities | 5,984,497 | 5,157,827
Net insurance contract liabilities (assets) | 5,984,497 | 5,157,827
Reinsurance contract assets | 0 | 0
Reinsurance contract liabilities | 0 | 0
Total net reinsurance contract assets (liabilities) | 0 | 0
Complex [member] |  |
Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | 0 | 0
Insurance contract liabilities | 0 | 0
Net insurance contract liabilities (assets) | 0 | 0
Reinsurance contract assets | 494,226 | 107,668
Reinsurance contract liabilities | 0 | 0
Total net reinsurance contract assets (liabilities) | 494,226 | 107,668
Long-term [member] |  |
Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | (760) | (1,051)
Insurance contract liabilities | 433 | 0
Net insurance contract liabilities (assets) | (327) | (1,051)
Reinsurance contract assets | 241 | 21
Reinsurance contract liabilities | 0 | 0
Total net reinsurance contract assets (liabilities) | 241 | 21
General [member] |  |
Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | 0 | (4,588)
Insurance contract liabilities | 168,767 | 160,346
Net insurance contract liabilities (assets) | 168,767 | 155,758
Reinsurance contract assets | 108,975 | 77,065
Reinsurance contract liabilities | 0 | (5)
Total net reinsurance contract assets (liabilities) | 108,975 | 77,060
Automobile [member] |  |
Disclosure Of Analysis Of Insurance Contract Liability [Line Items] |  |
Insurance contract assets | 0 | 0
Insurance contract liabilities | 820 | 1,189
Net insurance contract liabilities (assets) | 820 | 1,189
Reinsurance contract assets | 0 | 0
Reinsurance contract liabilities | 0 | 0
Total net reinsurance contract assets (liabilities) | ₩ 0 | ₩ 0

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- Definition The amount of insurance contracts liability (asset). [Refer: Assets; Liabilities; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_99_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of insurance contracts that are assets. [Refer: Assets; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_99_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of insurance contracts that are liabilities. [Refer: Liabilities; Insurance contracts [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 99 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_99_b&doctype=Standard -URIDate 2025-03-27 + Details
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