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Insurance Risk - Summary of The amount of claims development (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
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