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Liability under insurance contracts and reinsurance contracts - Summary of fair value amounts of basic items of insurance contracts (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items] |  |
Fair value amounts of basic items of insurance contracts | ₩ 4,469,969 | ₩ 3,958,036
Cash and amortized cost measurement deposits |  |
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items] |  |
Fair value amounts of basic items of insurance contracts | 371,582 | 294,963
Financial assets measured at FVTPL |  |
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items] |  |
Fair value amounts of basic items of insurance contracts | 4,004,935 | 3,561,126
Amortized cost loan receivables |  |
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items] |  |
Fair value amounts of basic items of insurance contracts | 40,245 | 32,489
Derivatives |  |
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items] |  |
Fair value amounts of basic items of insurance contracts | 429 | (150)
Other |  |
Disclosure Of Composition Details And Fair Value Amount Of Basic Items Of Insurance Contract With Direct Participants [Line Items] |  |
Fair value amounts of basic items of insurance contracts | ₩ 52,778 | ₩ 69,608

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- Definition The fair value of the underlying items for contracts with direct participation features. [Refer: Description of composition of underlying items for contracts with direct participation features] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 111 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_111&doctype=Standard -URIDate 2025-03-27 + Details
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