v3.26.1
Risk Management - Foreign currency risk exposure of financial instruments in foreign currency (Details)
€ in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, $ in Millions
Dec. 31, 2025
USD ($)
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
JPY (¥)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2024
JPY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
EUR (€)
Won equivalent | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   ₩ 85,077,102         ₩ 73,645,822      
Won equivalent | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   18,866,286         14,629,293      
Won equivalent | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   3,244,407         1,572,891      
Won equivalent | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   48,800,517         49,125,031      
Won equivalent | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   13,086,590         6,763,137      
Won equivalent | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   1,079,302         1,555,470      
Won equivalent | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   82,168,074         80,516,300      
Won equivalent | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   89,421         167,251      
Won equivalent | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   55,430,046         50,986,169      
Won equivalent | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   14,497,663         16,921,778      
Won equivalent | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   6,773,701         7,431,448      
Won equivalent | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   5,377,243         5,009,654      
Won equivalent | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts   17,632,707         16,749,532      
USD | Foreign currency | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | $ $ 40,722         $ 35,137        
USD | Foreign currency | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | $ 10,382         8,258        
USD | Foreign currency | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | $ 1,713         887        
USD | Foreign currency | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | $ 22,828         21,637        
USD | Foreign currency | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | $ 5,189         3,588        
USD | Foreign currency | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | $ 610         767        
USD | Foreign currency | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | $ 38,416         38,693        
USD | Foreign currency | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | $ 62         112        
USD | Foreign currency | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | $ 22,954         23,607        
USD | Foreign currency | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | $ 7,846         8,302        
USD | Foreign currency | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | $ 4,406         4,549        
USD | Foreign currency | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | $ 3,148         2,123        
USD | Foreign currency | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts | $ $ 10,487         $ 9,109        
USD | Won equivalent | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   58,433,103         51,620,552      
USD | Won equivalent | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   14,897,814         12,139,283      
USD | Won equivalent | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   2,458,578         1,304,438      
USD | Won equivalent | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   32,755,775         31,775,374      
USD | Won equivalent | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   7,445,013         5,274,144      
USD | Won equivalent | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   875,923         1,127,313      
USD | Won equivalent | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   55,123,656         56,878,737      
USD | Won equivalent | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   88,508         164,400      
USD | Won equivalent | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   32,937,144         34,702,743      
USD | Won equivalent | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   11,258,513         12,203,906      
USD | Won equivalent | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   6,322,500         6,687,333      
USD | Won equivalent | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   4,516,991         3,120,355      
USD | Won equivalent | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts   15,046,017         13,390,339      
JPY | Foreign currency | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥     ¥ 265,068         ¥ 187,272    
JPY | Foreign currency | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥     163,681         80,851    
JPY | Foreign currency | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥     1,587         1,836    
JPY | Foreign currency | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥     99,204         104,585    
JPY | Foreign currency | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥     596         0    
JPY | Foreign currency | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥     0         0    
JPY | Foreign currency | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥     269,254         327,713    
JPY | Foreign currency | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥     0         36    
JPY | Foreign currency | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥     215,351         250,528    
JPY | Foreign currency | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥     41,724         56,465    
JPY | Foreign currency | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥     0         0    
JPY | Foreign currency | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥     12,179         20,684    
JPY | Foreign currency | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts | ¥     ¥ 19,765         ¥ 23,905    
JPY | Won equivalent | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   2,979,325         1,753,766      
JPY | Won equivalent | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   1,501,990         757,154      
JPY | Won equivalent | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   14,562         17,190      
JPY | Won equivalent | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   915,492         979,422      
JPY | Won equivalent | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   547,281         0      
JPY | Won equivalent | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   0         0      
JPY | Won equivalent | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   2,470,757         3,068,966      
JPY | Won equivalent | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   1         334      
JPY | Won equivalent | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   1,976,126         2,346,146      
JPY | Won equivalent | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   382,874         528,785      
JPY | Won equivalent | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   0         0      
JPY | Won equivalent | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   111,756         193,701      
JPY | Won equivalent | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts   181,369         223,864      
CNY | Foreign currency | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥       ¥ 28,472         ¥ 32,093  
CNY | Foreign currency | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥       1,440         1,331  
CNY | Foreign currency | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥       11         16  
CNY | Foreign currency | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥       18,707         26,856  
CNY | Foreign currency | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥       8,043         2,910  
CNY | Foreign currency | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | ¥       271         980  
CNY | Foreign currency | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥       24,605         31,531  
CNY | Foreign currency | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥       0         0  
CNY | Foreign currency | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥       21,625         27,301  
CNY | Foreign currency | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥       957         110  
CNY | Foreign currency | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥       600         0  
CNY | Foreign currency | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | ¥       1,423         4,120  
CNY | Foreign currency | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts | ¥       ¥ 1,163         ¥ 1,702  
CNY | Won equivalent | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   4,879,685         6,459,301      
CNY | Won equivalent | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   294,862         267,802      
CNY | Won equivalent | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   2,350         3,318      
CNY | Won equivalent | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   3,830,414         5,405,371      
CNY | Won equivalent | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   696,669         585,622      
CNY | Won equivalent | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   55,390         197,188      
CNY | Won equivalent | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   5,038,178         6,346,325      
CNY | Won equivalent | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   0         0      
CNY | Won equivalent | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   4,428,000         5,494,893      
CNY | Won equivalent | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   195,936         22,235      
CNY | Won equivalent | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   122,856         0      
CNY | Won equivalent | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   291,386         829,197      
CNY | Won equivalent | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts   238,158         342,576      
EUR | Foreign currency | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | €         € 4,569         € 2,656
EUR | Foreign currency | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | €         396         223
EUR | Foreign currency | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | €         279         149
EUR | Foreign currency | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | €         2,122         2,211
EUR | Foreign currency | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | €         1,765         37
EUR | Foreign currency | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies | €         7         36
EUR | Foreign currency | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | €         6,397         3,009
EUR | Foreign currency | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | €         0         1
EUR | Foreign currency | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | €         5,781         2,024
EUR | Foreign currency | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | €         359         545
EUR | Foreign currency | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | €         195         195
EUR | Foreign currency | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies | €         62         244
EUR | Foreign currency | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts | €         € 953         € 841
EUR | Won equivalent | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   7,703,059         4,060,739      
EUR | Won equivalent | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   667,551         341,326      
EUR | Won equivalent | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   470,231         227,858      
EUR | Won equivalent | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   3,577,181         3,380,628      
EUR | Won equivalent | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   2,975,486         55,853      
EUR | Won equivalent | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   12,610         55,074      
EUR | Won equivalent | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   10,783,569         4,599,774      
EUR | Won equivalent | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   774         1,766      
EUR | Won equivalent | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   9,744,458         3,094,378      
EUR | Won equivalent | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   605,116         832,661      
EUR | Won equivalent | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   328,345         297,766      
EUR | Won equivalent | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   104,876         373,203      
EUR | Won equivalent | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts   1,605,830         1,286,110      
Others | Won equivalent | Total Asset                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   11,081,930         9,751,464      
Others | Won equivalent | Cash and cash equivalents                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   1,504,069         1,123,728      
Others | Won equivalent | Financial assets at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   298,686         20,087      
Others | Won equivalent | Loans and other financial assets at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   7,721,655         7,584,236      
Others | Won equivalent | Financial assets at FVTOCI                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   1,422,141         847,518      
Others | Won equivalent | Securities at amortized cost                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial assets denominated in foregin currencies   135,379         175,895      
Others | Won equivalent | Total Liability                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   8,751,914         9,622,498      
Others | Won equivalent | Financial liabilities at FVTPL                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   138         751      
Others | Won equivalent | Deposits due to customers                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   6,344,318         5,348,009      
Others | Won equivalent | Borrowings                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   2,055,224         3,334,191      
Others | Won equivalent | Debentures                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   0         446,349      
Others | Won equivalent | Other financial liabilities                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Financial liabilities denominated in foregin currencies   352,234         493,198      
Others | Won equivalent | Off-balance accounts                    
Financial statement lineitems with diffrences in reported amount and reporting currency denominated amounts [Line Items]                    
Off balance accounts   ₩ 561,333         ₩ 1,506,643