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Securities at fair value through other comprehensive income and securities at amortized cost - Changes in carrying value of securities at fair value through other comprehensive income and securities at amortized cost (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt securities at fair value through other comprehensive income    
Changes in carrying value of securities at fair value through other comprehensive income and securities at amortized cost [Line Items]    
Beginning balance ₩ 92,016,210 ₩ 88,637,000
Transfer (from) to 12-month expected credit loss 0 0
Transfer (from) to life time expected credit loss 0 0
Net increase and decrease [1] 9,266,696 3,379,210
Ending balance 101,282,906 92,016,210
Debt securities at fair value through other comprehensive income | 12-month expected credit losses    
Changes in carrying value of securities at fair value through other comprehensive income and securities at amortized cost [Line Items]    
Beginning balance 91,955,452 88,545,051
Transfer (from) to 12-month expected credit loss 5,276 3,798
Transfer (from) to life time expected credit loss (2,939) 0
Net increase and decrease [1] 9,298,286 3,406,603
Ending balance 101,256,075 91,955,452
Debt securities at fair value through other comprehensive income | Lifetime expected credit losses    
Changes in carrying value of securities at fair value through other comprehensive income and securities at amortized cost [Line Items]    
Beginning balance 60,758 91,949
Transfer (from) to 12-month expected credit loss (5,276) (3,798)
Transfer (from) to life time expected credit loss 2,939 0
Net increase and decrease [1] (31,590) (27,393)
Ending balance 26,831 60,758
Debt securities at amortized cost    
Changes in carrying value of securities at fair value through other comprehensive income and securities at amortized cost [Line Items]    
Beginning balance 33,326,187 35,697,910
Transfer (from) to 12-month expected credit loss 0 0
Transfer (from) to life time expected credit loss 0 0
Net increase and decrease [1] (1,373,128) (2,371,723)
Ending balance 31,953,059 33,326,187
Debt securities at amortized cost | 12-month expected credit losses    
Changes in carrying value of securities at fair value through other comprehensive income and securities at amortized cost [Line Items]    
Beginning balance 33,322,543 35,690,387
Transfer (from) to 12-month expected credit loss 0 0
Transfer (from) to life time expected credit loss 0 0
Net increase and decrease [1] (1,369,484) (2,367,844)
Ending balance 31,953,059 33,322,543
Debt securities at amortized cost | Lifetime expected credit losses    
Changes in carrying value of securities at fair value through other comprehensive income and securities at amortized cost [Line Items]    
Beginning balance 3,644 7,523
Transfer (from) to 12-month expected credit loss 0 0
Transfer (from) to life time expected credit loss 0 0
Net increase and decrease [1] (3,644) (3,879)
Ending balance ₩ 0 ₩ 3,644
[1] Includes the effects of purchases, disposals, redemptions, valuations, changes in foreign exchange rates, and the amortization of fair value adjustments recognized through business combination accounting, among others.