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Insurance finance income and expense - Summary of insurance finance income and expense (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Total insurance finance income and expense recognized in current profit or loss | ₩ (1,191,195) | ₩ (99,439) | ₩ (516,097)
Insurance finance income and expense recognized as other comprehensive income (*) | 1,748,627 | (3,171,486) | (2,961,019)
Reinsurance finance income and expense recognized in other comprehensive income (*) | (211,733) | (2,073) | (28,283)
Total insurance finance income and expense recognized in profit or loss and other comprehensive income | 345,699 | (3,272,998) | (3,505,399)
General life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Total insurance finance income and expense recognized in current profit or loss | 9,904 | (13,888) | 31,760
Insurance finance income and expense recognized as other comprehensive income (*) | 1,791,470 | (3,124,198) | (2,970,845)
Reinsurance finance income and expense recognized in other comprehensive income (*) | (211,718) | (2,098) | (28,276)
Total insurance finance income and expense recognized in profit or loss and other comprehensive income | 1,589,656 | (3,140,184) | (2,967,361)
Variable life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Total insurance finance income and expense recognized in current profit or loss | (1,201,088) | (85,506) | (547,819)
Insurance finance income and expense recognized as other comprehensive income (*) | (42,982) | (47,215) | 9,841
Reinsurance finance income and expense recognized in other comprehensive income (*) | 0 | 0 | 0
Total insurance finance income and expense recognized in profit or loss and other comprehensive income | (1,244,070) | (132,721) | (537,978)
Retirement life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Total insurance finance income and expense recognized in current profit or loss | 0 | 0 | 0
Insurance finance income and expense recognized as other comprehensive income (*) | 0 | 0 | 0
Reinsurance finance income and expense recognized in other comprehensive income (*) | 0 | 0 | 0
Total insurance finance income and expense recognized in profit or loss and other comprehensive income | 0 | 0 | 0
Long-term non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Total insurance finance income and expense recognized in current profit or loss | 0 | 0 | 0
Insurance finance income and expense recognized as other comprehensive income (*) | 107 | (47) | (15)
Reinsurance finance income and expense recognized in other comprehensive income (*) | 8 | 7 | (7)
Total insurance finance income and expense recognized in profit or loss and other comprehensive income | 115 | (40) | (22)
General non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Total insurance finance income and expense recognized in current profit or loss | (11) | (45) | (38)
Insurance finance income and expense recognized as other comprehensive income (*) | 32 | (26) | 0
Reinsurance finance income and expense recognized in other comprehensive income (*) | (23) | 18 | 0
Total insurance finance income and expense recognized in profit or loss and other comprehensive income | (2) | (53) | (38)
Automobile [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Total insurance finance income and expense recognized in current profit or loss | 0 | 0 | 0
Insurance finance income and expense recognized as other comprehensive income (*) | 0 | 0 | 0
Reinsurance finance income and expense recognized in other comprehensive income (*) | 0 | 0 | 0
Total insurance finance income and expense recognized in profit or loss and other comprehensive income | 0 | 0 | 0
Insurance contracts issued [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 43,858 | 202,370 | 143,102
Insurance finance expenses | 1,235,254 | 301,802 | 659,161
Insurance contracts issued [member] | General life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 25,736 | 35,658 | 52,040
Insurance finance expenses | 16,044 | 49,586 | 20,280
Insurance contracts issued [member] | Variable life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 18,122 | 166,710 | 91,062
Insurance finance expenses | 1,219,210 | 252,216 | 638,881
Insurance contracts issued [member] | Retirement life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Long-term non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | General non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 2 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Automobile [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Effect of Foreign Exchange Rate Changes [Member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 20,253 | 13,896 | 13,656
Insurance finance expenses | 15,824 | 48,410 | 19,345
Insurance contracts issued [member] | Effect of Foreign Exchange Rate Changes [Member] | General life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 20,253 | 13,896 | 13,656
Insurance finance expenses | 15,824 | 48,410 | 19,345
Insurance contracts issued [member] | Effect of Foreign Exchange Rate Changes [Member] | Variable life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Effect of Foreign Exchange Rate Changes [Member] | Retirement life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Effect of Foreign Exchange Rate Changes [Member] | Long-term non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Effect of Foreign Exchange Rate Changes [Member] | General non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Effect of Foreign Exchange Rate Changes [Member] | Automobile [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Other Effects [Member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 23,605 | 188,474 | 129,446
Insurance finance expenses | 1,219,430 | 253,392 | 639,816
Insurance contracts issued [member] | Other Effects [Member] | General life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 5,483 | 21,762 | 38,384
Insurance finance expenses | 220 | 1,176 | 935
Insurance contracts issued [member] | Other Effects [Member] | Variable life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 18,122 | 166,710 | 91,062
Insurance finance expenses | 1,219,210 | 252,216 | 638,881
Insurance contracts issued [member] | Other Effects [Member] | Retirement life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Other Effects [Member] | Long-term non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Other Effects [Member] | General non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 2 | 0
Insurance finance expenses | 0 | 0 | 0
Insurance contracts issued [member] | Other Effects [Member] | Automobile [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 | 0 | 0
Reinsurance contracts held [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 44,087 | 202,363 | 143,064
Insurance finance expenses | 1,235,282 |  |
Reinsurance contracts held [member] | General life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 25,965 | 35,698 | 52,040
Insurance finance expenses | 16,061 |  |
Reinsurance contracts held [member] | Variable life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 18,122 | 166,710 | 91,062
Insurance finance expenses | 1,219,210 |  |
Reinsurance contracts held [member] | Retirement life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 |  |
Reinsurance contracts held [member] | Long-term non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 |  |
Reinsurance contracts held [member] | General non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | (45) | (38)
Insurance finance expenses | 11 |  |
Reinsurance contracts held [member] | Automobile [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 |  |
Reinsurance contracts held [member] | Discount Rate Change Effect [Member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 229 | (7) | (38)
Insurance finance expenses | 28 |  |
Reinsurance contracts held [member] | Discount Rate Change Effect [Member] | General life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 229 | 40 | 0
Insurance finance expenses | 17 |  |
Reinsurance contracts held [member] | Discount Rate Change Effect [Member] | Variable life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 |  |
Reinsurance contracts held [member] | Discount Rate Change Effect [Member] | Retirement life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 |  |
Reinsurance contracts held [member] | Discount Rate Change Effect [Member] | Long-term non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | 0 | 0
Insurance finance expenses | 0 |  |
Reinsurance contracts held [member] | Discount Rate Change Effect [Member] | General non-life insurance [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | (47) | (38)
Insurance finance expenses | 11 |  |
Reinsurance contracts held [member] | Discount Rate Change Effect [Member] | Automobile [member] |  |  |
Disclosure of reconciliation of changes in insurance contracts by components [line items] |  |  |
Insurance finance income | 0 | ₩ 0 | ₩ 0
Insurance finance expenses | ₩ 0 |  |

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