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Liability under insurance contracts and reinsurance contracts - Summary of reinsurance contracts that did not apply the premium allocation approach recognized for the first time (Details) - Insurance contracts other than those to which premium allocation approach has been applied [member] - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | ₩ 32,646 | ₩ 27,640
Reinsurance contracts held |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 1,638 | 1,480
Reinsurance contracts held | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 1,638 | 1,480
Reinsurance contracts held | Groups of contracts issued other than net profit contracts [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 1,364 | 490
Reinsurance contracts held | Groups of net profit contracts issued [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 274 | 990
Other than insurance acquisition cash flow amount [member] | Reinsurance contracts held | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | (1,808,769) | (224,169)
Other than insurance acquisition cash flow amount [member] | Reinsurance contracts held | Groups of contracts issued other than net profit contracts [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | (1,746,549) | (160,095)
Other than insurance acquisition cash flow amount [member] | Reinsurance contracts held | Groups of net profit contracts issued [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | (62,220) | (64,074)
Insurance acquisition cash flow amount [member] | Reinsurance contracts held | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 0 | 0
Insurance acquisition cash flow amount [member] | Reinsurance contracts held | Groups of contracts issued other than net profit contracts [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 0 | 0
Insurance acquisition cash flow amount [member] | Reinsurance contracts held | Groups of net profit contracts issued [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 0 | 0
Present value estimate of future cash inflows [member] | Reinsurance contracts held | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 1,539,839 | 178,048
Present value estimate of future cash inflows [member] | Reinsurance contracts held | Groups of contracts issued other than net profit contracts [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 1,478,971 | 109,889
Present value estimate of future cash inflows [member] | Reinsurance contracts held | Groups of net profit contracts issued [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 60,868 | 68,159
Risk adjustment for non-financial risks [member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 224,776 | 157,279
Risk adjustment for non-financial risks [member] | Reinsurance contracts held |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 16,978 | 4,672
Risk adjustment for non-financial risks [member] | Reinsurance contracts held | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 16,978 | 4,672
Risk adjustment for non-financial risks [member] | Reinsurance contracts held | Groups of contracts issued other than net profit contracts [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 15,475 | 3,098
Risk adjustment for non-financial risks [member] | Reinsurance contracts held | Groups of net profit contracts issued [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 1,503 | 1,574
Contractual service margin [member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 1,649,798 | 1,266,258
Contractual service margin [member] | Reinsurance contracts held |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 253,590 | 42,929
Contractual service margin [member] | Reinsurance contracts held | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 253,590 | 42,929
Contractual service margin [member] | Reinsurance contracts held | Groups of contracts issued other than net profit contracts [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | 253,467 | 47,598
Contractual service margin [member] | Reinsurance contracts held | Groups of net profit contracts issued [Member] | Premium Allocation Approach [Member] |  |
Disclosure of effect of insurance contracts initially recognised [line items] |  |
Increase (decrease) through effects of contracts initially recognised in period, insurance contracts liability (asset) | ₩ 123 | ₩ (4,669)

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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 increase (decrease) in insurance contracts liability (asset) resulting from the effects of contracts initially recognised in the period. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 107 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_107&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 104 -Subparagraph a -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_104_a_iii&doctype=Standard -URIDate 2025-03-27 + Details
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