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Liability under insurance contracts and reinsurance contracts - Summary of information about expected recognition of contractual service margin in profit or loss (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | ₩ 9,943,412 | ₩ 9,769,333
1 year or less |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | 608,355 | 613,018
1~2 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | 542,852 | 527,795
2~5 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | 1,365,661 | 1,331,128
5~10 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | 1,682,380 | 1,664,754
More than 10 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | 5,744,164 | 5,632,638
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract assets [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (279,139) | (169,179)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract assets [member] | 1 year or less |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (19,328) | (12,551)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract assets [member] | 1~2 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (18,168) | (11,363)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract assets [member] | 2~5 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (49,285) | (29,455)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract assets [member] | 5~10 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (67,992) | (38,460)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract assets [member] | More than 10 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (124,366) | (77,350)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract liabilities [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (211,895) | (185,780)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract liabilities [member] | 1 year or less |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (18,802) | (13,874)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract liabilities [member] | 1~2 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (16,756) | (12,036)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract liabilities [member] | 2~5 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (38,942) | (30,495)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract liabilities [member] | 5~10 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (43,802) | (35,569)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contract liabilities [member] | More than 10 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (93,593) | (93,806)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (491,034) | (354,959)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | 1 year or less |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (38,130) | (26,425)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | 1~2 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (34,924) | (23,399)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | 2~5 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (88,227) | (59,950)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | 5~10 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | (111,794) | (74,029)
Insurance contracts other than those to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | More than 10 years [member] |  |
Disclosure of information about expected recognition of contractual service margin in profit or loss [line items] |  |
Contractual service margin | ₩ (217,959) | ₩ (171,156)

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- Definition The amount of the contractual service margin. [Refer: Contractual service margin [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 109 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_109&doctype=Standard -URIDate 2025-03-27 + Details
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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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