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Derivatives - Gain or loss on fair value hedges (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Gain or loss on fair value hedges [Line Items] |  |  |  |
Gains and losses on fair value hedges (hedged items) |  | ₩ (124,140) | ₩ (2,718) | ₩ (267,323)
Gains and losses on fair value hedges (hedging instruments) |  | 156,904 | (2,486) | 277,571
Hedge ineffectiveness recognized in profit or loss | [1] | 32,764 | (5,204) | 10,248
Interest rate swap |  |  |  |
Gain or loss on fair value hedges [Line Items] |  |  |  |
Gains and losses on fair value hedges (hedged items) | [2] | (120,061) | (45,264) | (271,425)
Gains and losses on fair value hedges (hedging instruments) | [2] | 138,277 | 42,787 | 282,835
Foreign Exchange Risk |  |  |  |
Gain or loss on fair value hedges [Line Items] |  |  |  |
Gains and losses on fair value hedges (hedged items) | [2] | 278 | 44,094 | 4,102
Gains and losses on fair value hedges (hedging instruments) | [2] | 14,686 | (46,382) | (5,264)
Other price risk [member] |  |  |  |
Gain or loss on fair value hedges [Line Items] |  |  |  |
Gains and losses on fair value hedges (hedged items) | [2] | (4,357) | (1,548) |
Gains and losses on fair value hedges (hedging instruments) | [2] | 3,941 | 1,109 |
Hedge ineffectiveness recognized in profit or loss | [1],[2] | (416) | (439) |
Interest rate risk |  |  |  |
Gain or loss on fair value hedges [Line Items] |  |  |  |
Hedge ineffectiveness recognized in profit or loss | [1],[2] | 18,216 | (2,477) | 11,410
Foreign exchange risk |  |  |  |
Gain or loss on fair value hedges [Line Items] |  |  |  |
Hedge ineffectiveness recognized in profit or loss | [1],[2] | ₩ 14,964 | ₩ (2,288) | ₩ (1,162)
[1] | Hedging ineffectiveness represents the difference between the changes in fair value of the hedging instruments and the hedged items.
[2] | The related account categories are presented in the amounts of interest rate swap assets and liabilities, currency forward assets and liabilities, and equity option liabilities.

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