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Insurance Risk - Summary of The amount of claims development (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of actual claims compared with previous estimates [line items] |  |
Estimate of undiscounted claims that arise from contracts within scope of IFRS 17 | ₩ 5,982,685 | ₩ 5,520,253
Actual claims that arise from contracts within scope of IFRS 17 | 5,559,449 | 5,152,016
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 1,683,333 | 1,720,678
Four years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Estimate of undiscounted claims that arise from contracts within scope of IFRS 17 | 1,069,793 | 959,974
Actual claims that arise from contracts within scope of IFRS 17 | 1,064,326 | 954,904
Three years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Estimate of undiscounted claims that arise from contracts within scope of IFRS 17 | 1,106,219 | 1,070,850
Actual claims that arise from contracts within scope of IFRS 17 | 1,095,401 | 1,060,354
Two years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Estimate of undiscounted claims that arise from contracts within scope of IFRS 17 | 1,154,705 | 1,104,112
Actual claims that arise from contracts within scope of IFRS 17 | 1,128,642 | 1,080,439
One year before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Estimate of undiscounted claims that arise from contracts within scope of IFRS 17 | 1,232,242 | 1,152,207
Actual claims that arise from contracts within scope of IFRS 17 | 1,172,745 | 1,098,606
Reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Estimate of undiscounted claims that arise from contracts within scope of IFRS 17 | 1,419,726 | 1,233,110
Actual claims that arise from contracts within scope of IFRS 17 | 1,098,335 | 957,713
The difference between the estimated ultimate loss and paid claims [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 423,236 | 368,237
The difference between the estimated ultimate loss and paid claims [Member] | Four years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 5,467 | 5,070
The difference between the estimated ultimate loss and paid claims [Member] | Three years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 10,818 | 10,496
The difference between the estimated ultimate loss and paid claims [Member] | Two years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 26,063 | 23,673
The difference between the estimated ultimate loss and paid claims [Member] | One year before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 59,497 | 53,601
The difference between the estimated ultimate loss and paid claims [Member] | Reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 321,391 | 275,397
Discount effect [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | (12,313) | (11,011)
Future loss adjustment expenses [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 9,205 | 7,316
Reported but unpaid claims [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 1,366,616 | 1,436,530
Risk adjustment for non-financial risk [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | 15,973 | 14,041
Reinsurance effect [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Liabilities for incurred claims that arise from contracts within scope of IFRS 17 | (119,384) | (94,435)
Current year [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 4,638,106 | 4,292,248
Current year [Member] | Four years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 832,601 | 746,984
Current year [Member] | Three years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 857,694 | 833,427
Current year [Member] | Two years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 896,770 | 857,650
Current year [Member] | One year before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 952,706 | 896,474
Current year [Member] | Reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 1,098,335 | 957,713
1 year after [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 803,617 | 750,645
1 year after [Member] | Four years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 187,431 | 166,072
1 year after [Member] | Three years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 194,972 | 187,415
1 year after [Member] | Two years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 201,175 | 195,026
1 year after [Member] | One year before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 220,039 | 202,132
2 years after [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 85,835 | 78,947
2 years after [Member] | Four years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 27,435 | 23,751
2 years after [Member] | Three years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 27,703 | 27,433
2 years after [Member] | Two years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 30,697 | 27,763
3 years after [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 27,032 | 25,327
3 years after [Member] | Four years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 12,000 | 13,248
3 years after [Member] | Three years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 15,032 | 12,079
4 years after [Member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | 4,859 | 4,849
4 years after [Member] | Four years before reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 | ₩ 4,859 | 4,849
4 years after [Member] | Reporting year [member] |  |
Disclosure of actual claims compared with previous estimates [line items] |  |
Actual claims that arise from contracts within scope of IFRS 17 |  | ₩ 0

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- Definition The amount of the actual claims that arise from contracts within the scope of IFRS 17. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 130 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_130&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The estimate of the undiscounted amount of the claims that arise from contracts within the scope of IFRS 17. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 130 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_130&doctype=Standard -URIDate 2025-03-27 + Details
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