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Derivatives - Gain or loss on fair value hedges (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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.