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Provisions - Summary of changes in provision for unused credit commitments and financial guarantee contracts issued (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in provisions [Line Items]    
Beginning balance ₩ 1,308,896  
Ending balance 1,363,345 ₩ 1,308,896
Provision for unused credit commitments and financial guarantee contracts issued    
Changes in provisions [Line Items]    
Beginning balance 498,363 395,589
Transfer (from) to 12 months expected credit loss 0 0
Transfer (from) to life time expected credit loss 0 0
Transfer (from) to impaired financial asset 0 0
Provided   41,910
Reversed (105,879)  
Change in foreign exchange rate (4,020) 9,795
Others 11,184 51,069
Ending balance 399,648 498,363
Unused credit commitments provision | 12-month expected credit losses    
Changes in provisions [Line Items]    
Beginning balance 229,415 206,687
Transfer (from) to 12 months expected credit loss 48,121 68,071
Transfer (from) to life time expected credit loss (13,183) (11,698)
Transfer (from) to impaired financial asset (767) (806)
Reversed (50,312) (40,306)
Change in foreign exchange rate (3,089) 5,340
Others (295) 2,127
Ending balance 209,890 229,415
Unused credit commitments provision | Lifetime expected credit losses    
Changes in provisions [Line Items]    
Beginning balance 88,843 129,182
Transfer (from) to 12 months expected credit loss (47,999) (67,931)
Transfer (from) to life time expected credit loss 13,237 11,723
Transfer (from) to impaired financial asset (972) (1,561)
Provided 40,278 16,043
Change in foreign exchange rate (445) 1,347
Others 0 40
Ending balance 92,942 88,843
Unused credit commitments provision | Impaired financial asset    
Changes in provisions [Line Items]    
Beginning balance 93,017 19,722
Transfer (from) to 12 months expected credit loss (122) (140)
Transfer (from) to life time expected credit loss (54) (25)
Transfer (from) to impaired financial asset 1,739 2,367
Provided   71,093
Reversed (91,457)  
Change in foreign exchange rate 0 0
Others 0 0
Ending balance 3,123 93,017
Financial guarantee contracts    
Changes in provisions [Line Items]    
Beginning balance 87,088  
Ending balance 93,693 87,088
Financial guarantee contracts | 12-month expected credit losses    
Changes in provisions [Line Items]    
Beginning balance 80,780 32,002
Transfer (from) to 12 months expected credit loss 1,420 4,968
Transfer (from) to life time expected credit loss (3,336) (366)
Transfer (from) to impaired financial asset 0 0
Reversed (3,308) (3,783)
Change in foreign exchange rate (333) 2,316
Others 6,915 45,643
Ending balance 82,138 80,780
Financial guarantee contracts | Lifetime expected credit losses    
Changes in provisions [Line Items]    
Beginning balance 6,296 7,590
Transfer (from) to 12 months expected credit loss (1,420) (4,968)
Transfer (from) to life time expected credit loss 3,336 366
Transfer (from) to impaired financial asset 0 0
Reversed (1,077) (1,139)
Change in foreign exchange rate (154) 791
Others 4,573 3,656
Ending balance 11,554 6,296
Financial guarantee contracts | Impaired financial asset    
Changes in provisions [Line Items]    
Beginning balance 12 406
Transfer (from) to 12 months expected credit loss 0 0
Transfer (from) to life time expected credit loss 0 0
Transfer (from) to impaired financial asset 0 0
Provided   2
Reversed (3)  
Change in foreign exchange rate 1 1
Others (9) (397)
Ending balance 1 12
Other provisions    
Changes in provisions [Line Items]    
Beginning balance 810,533 974,077
Provided 349,146 369,755
Provision used (204,225) (540,997)
Change in foreign exchange rate (79) 1,929
Others 8,322 5,769
Ending balance 963,697 810,533
Asset retirement    
Changes in provisions [Line Items]    
Beginning balance 99,306 99,927
Provided 6,739 957
Provision used (3,363) (7,282)
Change in foreign exchange rate 0 0
Others 3,443 5,704
Ending balance 106,125 99,306
Litigation    
Changes in provisions [Line Items]    
Beginning balance 114,750 31,371
Provided 26,032 83,862
Provision used (69,713) (483)
Change in foreign exchange rate 0 0
Others 73,104 0
Ending balance 144,173 114,750
Guarantee    
Changes in provisions [Line Items]    
Beginning balance 17,363 23,163
Provided 404  
Reversed   (8,471)
Provision used 0 0
Change in foreign exchange rate (245) 2,412
Others 92 259
Ending balance 17,614 17,363
Other    
Changes in provisions [Line Items]    
Beginning balance 579,114 819,616
Provided 315,971 293,407
Provision used (131,149) (533,232)
Change in foreign exchange rate 166 (483)
Others (68,317) (194)
Ending balance 695,785 ₩ 579,114
Gross carrying amount [member]    
Changes in provisions [Line Items]    
Others ₩ 72,868