v3.26.1
Related Party Transaction - Summary Of Assets And Liabilities From Transactions With Related Parties (Details)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2023
KRW (₩)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2022
KRW (₩)
Disclosure of transactions between related parties [line items]            
Cash and cash equivalents ₩ 38,499,679 ₩ 27,281,123 ₩ 30,556,618 $ 26,651,676 $ 18,885,551 ₩ 34,219,148
Description of other related parties with outstanding balances Others include IGEN2022No. 1 Private Equity Fund and etc., as of December 31, 2024 and 2025. Others include IGEN2022No. 1 Private Equity Fund and etc., as of December 31, 2024 and 2025.        
W Service Networks Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Loans ₩ 30 ₩ 51        
Loans 30 [1] 51 [1] ₩ 108 [1]     120
Deposits due to customers 3,009 3,054        
Accrued expenses 7 86        
Other liabilities ₩ 316 ₩ 339        
Description of nature of related party relationship Associates Associates Associates      
Korea Credit Bureau Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Loans ₩ 0 ₩ 1        
Loans 0 [1] 1 [1] ₩ 1 [1]     2
Deposits due to customers 2,615 780        
Accrued expenses 0 13        
Other liabilities ₩ 10 ₩ 0        
Description of nature of related party relationship Associates Associates Associates      
Korea Finance Security Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Loans ₩ 3,435 ₩ 3,225        
Loans 3,435 [1] 3,225 [1] ₩ 3,228 [1]     3,433
Deposits due to customers 2,138 1,145        
Loss allowance (23) (43)        
Other liabilities ₩ 1 ₩ 3        
Description of nature of related party relationship Associates Associates Associates      
LOTTE CARD Co.,Ltd.            
Disclosure of transactions between related parties [line items]            
Loans ₩ 26,880 [1] ₩ 27,913 [1] ₩ 12,209 [1]     50,000
Deposits due to customers 22,869 20,207        
Accrued expenses 39 0        
Derivative assets 564 1,075        
Other assets 256 49        
Loss allowance (295) (297)        
Account receivables 35 21        
Derivative liabilities 807 0        
Other liabilities ₩ 289 ₩ 273        
Description of nature of related party relationship Associates Associates Associates      
K BANK Co., Ltd.            
Disclosure of transactions between related parties [line items]            
Cash and cash equivalents ₩ 192 ₩ 0        
Loans 17 [1] 18 [1] ₩ 54 [1]     ₩ 3
Other assets 43 0        
Account receivables 9 32        
Other liabilities ₩ 158,668 ₩ 193,719        
Description of nature of related party relationship Associates Associates Associates      
Others            
Disclosure of transactions between related parties [line items]            
Loans [2] ₩ 42,903 ₩ 38,819        
Deposits due to customers [2] 2,259 3,575        
Other assets [2] 9,116 66,088        
Loss allowance [2] (139) (273)        
Other liabilities [2] ₩ 541 ₩ 232        
Description of nature of related party relationship Associates Associates Associates      
[1] Payments that occurred for business reasons among related parties are excluded and net increase or decrease was used for limited credit loan.
[2] Others include IGEN2022No. 1 Private Equity Fund and etc., as of December 31, 2024 and 2025.