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Liability under insurance contracts and reinsurance contracts - Summary of reconciliation of changes in insurance contracts by remaining coverage and incurred claims for which the applying the premium distribution approach (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Beginning balance, Reinsurance contract assets | ₩ 184,754 |  |
Beginning balance, Reinsurance contract liabilities | 98,063 |  |
Reinsurance revenue | 3,364,322 | ₩ 3,116,553 | ₩ 2,899,599
Reinsurance finance income and expense, Other comprehensive income | (211,733) | (2,073) | (28,283)
Reinsurance finance income and expense | (1,191,195) | (99,439) | (516,097)
Ending balance, Reinsurance contract assets | 603,442 | 184,754 |
Ending balance, Reinsurance contract liabilities | 56,378 | 98,063 |
Insurance contracts to which premium allocation approach has been applied [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Reinsurance revenue | 101,942 | 64,554 | 39,641
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Beginning balance, Reinsurance contract assets | 77,065 | 25,539 |
Beginning balance, Reinsurance contract liabilities | (5) | (78) |
Beginning balance, Net reinsurance contract assets (liabilities) | 77,060 | 25,461 |
Reinsurance revenue, Incurred reinsurance claims | 35,435 | 16,498 |
Reinsurance revenue-Changes in liabilities for incurred claims | 112 | 4,059 |
Reinsurance revenue, Other | 1,778 | (120) |
Reinsurance revenue | 37,325 | 20,437 |
Reinsurance service expense | (38,642) | (18,052) |
Recovery of investment elements and reinsurance premiums | 0 | 0 |
Reinsurance finance income and expense, profit or loss | 3,133 | 2,175 |
Reinsurance finance income and expense, Other comprehensive income | (24) | 18 |
Reinsurance finance income and expense | 3,109 | 2,193 |
Cash flow for the period, Reinsurance premium paid | 42,773 | 2,128 |
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income | (12,650) | 33,051 |
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums | 0 | 0 |
Cash flow for the period | 30,123 | 35,179 |
Other increases (decreases) | 0 | 11,842 |
Ending balance, Reinsurance contract assets | 108,975 | 77,065 | 25,539
Ending balance, Reinsurance contract liabilities | 0 | (5) | (78)
Ending balance, Net reinsurance contract assets (liabilities) | 108,975 | 77,060 | 25,461
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | Present value estimate of future cash flows [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Beginning balance, Reinsurance contract assets | 23,144 | 4,244 |
Beginning balance, Reinsurance contract liabilities | (5) | (19) |
Beginning balance, Net reinsurance contract assets (liabilities) | 23,139 | 4,225 |
Reinsurance revenue, Incurred reinsurance claims | 33,682 | 15,934 |
Reinsurance revenue-Changes in liabilities for incurred claims | 136 | 3,476 |
Reinsurance revenue, Other | 0 | 0 |
Reinsurance revenue | 33,818 | 19,410 |
Reinsurance service expense | 0 | 0 |
Recovery of investment elements and reinsurance premiums | 0 | 0 |
Reinsurance finance income and expense, profit or loss | 114 | 97 |
Reinsurance finance income and expense, Other comprehensive income | (19) | 14 |
Reinsurance finance income and expense | 95 | 111 |
Cash flow for the period, Reinsurance premium paid | 0 | 0 |
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income | (12,650) | 33,051 |
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums | 0 | 0 |
Cash flow for the period | (12,650) | 33,051 |
Other increases (decreases) | 0 | (33,658) |
Ending balance, Reinsurance contract assets | 44,402 | 23,144 | 4,244
Ending balance, Reinsurance contract liabilities | 0 | (5) | (19)
Ending balance, Net reinsurance contract assets (liabilities) | 44,402 | 23,139 | 4,225
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | Risk adjustment for non-financial risks [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Beginning balance, Reinsurance contract assets | 1,517 | 104 |
Beginning balance, Reinsurance contract liabilities | 0 | 0 |
Beginning balance, Net reinsurance contract assets (liabilities) | 1,517 | 104 |
Reinsurance revenue, Incurred reinsurance claims | 1,753 | 564 |
Reinsurance revenue-Changes in liabilities for incurred claims | (24) | 838 |
Reinsurance revenue, Other | 0 | 0 |
Reinsurance revenue | 1,729 | 1,402 |
Reinsurance service expense | 0 | 0 |
Recovery of investment elements and reinsurance premiums | 0 | 0 |
Reinsurance finance income and expense, profit or loss | 35 | 7 |
Reinsurance finance income and expense, Other comprehensive income | (5) | 4 |
Reinsurance finance income and expense | 30 | 11 |
Cash flow for the period, Reinsurance premium paid | 0 | 0 |
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income | 0 | 0 |
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums | 0 | 0 |
Cash flow for the period | 0 | 0 |
Other increases (decreases) | 0 | 0 |
Ending balance, Reinsurance contract assets | 3,276 | 1,517 | 104
Ending balance, Reinsurance contract liabilities | 0 | 0 | 0
Ending balance, Net reinsurance contract assets (liabilities) | 3,276 | 1,517 | 104
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | Excluding loss recovery factors [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Beginning balance, Reinsurance contract assets | 51,439 | 19,971 |
Beginning balance, Reinsurance contract liabilities | 0 | (59) |
Beginning balance, Net reinsurance contract assets (liabilities) | 51,439 | 19,912 |
Reinsurance revenue, Incurred reinsurance claims | 0 | 0 |
Reinsurance revenue-Changes in liabilities for incurred claims | 0 | 0 |
Reinsurance revenue, Other | 0 | (120) |
Reinsurance revenue | 0 | (120) |
Reinsurance service expense | (38,642) | (18,052) |
Recovery of investment elements and reinsurance premiums | 0 | 0 |
Reinsurance finance income and expense, profit or loss | 2,984 | 2,071 |
Reinsurance finance income and expense, Other comprehensive income | 0 | 0 |
Reinsurance finance income and expense | 2,984 | 2,071 |
Cash flow for the period, Reinsurance premium paid | 42,773 | 2,128 |
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income | 0 | 0 |
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums | 0 | 0 |
Cash flow for the period | 42,773 | 2,128 |
Other increases (decreases) | 0 | 45,500 |
Ending balance, Reinsurance contract assets | 58,554 | 51,439 | 19,971
Ending balance, Reinsurance contract liabilities | 0 | 0 | (59)
Ending balance, Net reinsurance contract assets (liabilities) | 58,554 | 51,439 | 19,912
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | Loss recovery factor [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |  |
Beginning balance, Reinsurance contract assets | 965 | 1,220 |
Beginning balance, Reinsurance contract liabilities | 0 | 0 |
Beginning balance, Net reinsurance contract assets (liabilities) | 965 | 1,220 |
Reinsurance revenue, Incurred reinsurance claims | 0 | 0 |
Reinsurance revenue-Changes in liabilities for incurred claims | 0 | (255) |
Reinsurance revenue, Other | 1,778 | 0 |
Reinsurance revenue | 1,778 | (255) |
Reinsurance service expense | 0 | 0 |
Recovery of investment elements and reinsurance premiums | 0 | 0 |
Reinsurance finance income and expense, profit or loss | 0 | 0 |
Reinsurance finance income and expense, Other comprehensive income | 0 | 0 |
Reinsurance finance income and expense | 0 | 0 |
Cash flow for the period, Reinsurance premium paid | 0 | 0 |
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income | 0 | 0 |
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums | 0 | 0 |
Cash flow for the period | 0 | 0 |
Other increases (decreases) | 0 | 0 |
Ending balance, Reinsurance contract assets | 2,743 | 965 | 1,220
Ending balance, Reinsurance contract liabilities | 0 | 0 | 0
Ending balance, Net reinsurance contract assets (liabilities) | ₩ 2,743 | ₩ 965 | ₩ 1,220

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