v3.26.1
Insurance Contracts - Summary of the impact on the consolidated statement of financial position of insurance contracts (Details)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Disclosure of effect of insurance contracts initially recognised [line items]  
Initial recognition of new insurance contracts - Non-onerous contracts ₩ 0 [1]
Initial recognition of new insurance contracts - Onerous contracts 8,174 [1]
Sub-total 8,174
Business Combination 47,067,270
Total 47,075,444
Insurance acquisition cash flow  
Disclosure of effect of insurance contracts initially recognised [line items]  
Initial recognition of new insurance contracts - Non-onerous contracts 608,795 [1]
Initial recognition of new insurance contracts - Onerous contracts 46,026 [1]
Sub-total 654,821
Business Combination 630,150
Total 1,284,971
Insurance expenses and insurance  
Disclosure of effect of insurance contracts initially recognised [line items]  
Initial recognition of new insurance contracts - Non-onerous contracts 3,444,352 [1]
Initial recognition of new insurance contracts - Onerous contracts 227,758 [1]
Sub-total 3,672,110
Business Combination 101,042,991
Total 104,715,101
The estimates of the present value of future cash inflows  
Disclosure of effect of insurance contracts initially recognised [line items]  
Initial recognition of new insurance contracts - Non-onerous contracts (4,546,284) [1]
Initial recognition of new insurance contracts - Onerous contracts (268,857) [1]
Sub-total (4,815,141)
Business Combination (58,962,475)
Total (63,777,616)
Risk adjustment for non-financial risk [member]  
Disclosure of effect of insurance contracts initially recognised [line items]  
Initial recognition of new insurance contracts - Non-onerous contracts 46,095 [1]
Initial recognition of new insurance contracts - Onerous contracts 3,247 [1]
Sub-total 49,342
Business Combination 773,337
Total 822,679
Contractual Service Margin  
Disclosure of effect of insurance contracts initially recognised [line items]  
Initial recognition of new insurance contracts - Non-onerous contracts 447,042 [1]
Initial recognition of new insurance contracts - Onerous contracts 0 [1]
Sub-total 447,042
Business Combination 3,583,267
Total 4,030,309
Loss at initial recognition  
Disclosure of effect of insurance contracts initially recognised [line items]  
Initial recognition of new insurance contracts - Non-onerous contracts 0 [1]
Initial recognition of new insurance contracts - Onerous contracts 8,174 [1]
Sub-total 8,174
Business Combination 121
Total ₩ 8,295
[1] There are no insurance contracts acquired in a transfer.