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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
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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.

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