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Derivatives - Due to the ineffectiveness of hedge of cash flow risk and hedge of net investment in foreign operations during the year (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash Flow Hedges | Interest rate risk      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains (losses) on hedges recognized in other comprehensive income [1] ₩ (209,145) ₩ 89,293 ₩ 99,268
Hedge ineffectiveness recognized in profit or loss [1],[2] (8,743) (5,034) (512)
From cash flow hedge reserve to profit or loss Reclassified amount [1] 1,567 (151) (1,760)
Cash Flow Hedges | Foreign Exchange Risk      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains (losses) on hedges recognized in other comprehensive income [1] (35,688) 2,548 (10,294)
Hedge ineffectiveness recognized in profit or loss [1],[2] 2,776 (6,184) (7,069)
From cash flow hedge reserve to profit or loss Reclassified amount [1] (160,443) 210,424 (25,698)
Cash Flow Hedges | Discontinuation of cash flow hedges      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains (losses) on hedges recognized in other comprehensive income 1,532 (39,621) (5,531)
Hedge ineffectiveness recognized in profit or loss [2]     0
From cash flow hedge reserve to profit or loss Reclassified amount (28) 47,957 14,659
Hedges of net investment      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains (losses) on hedges recognized in other comprehensive income (184,205) (169,001) 79,540
Hedge ineffectiveness recognized in profit or loss [2] 15,455 (12,409) (3,908)
From cash flow hedge reserve to profit or loss Reclassified amount (158,904) 258,230 (12,799)
Hedges of net investment | Foreign Exchange Risk      
Disclosure of risk management strategy related to hedge accounting [line items]      
Gains (losses) on hedges recognized in other comprehensive income [1] 59,096 (221,221) (3,903)
Hedge ineffectiveness recognized in profit or loss [1],[2] 21,422 (1,191) 3,673
From cash flow hedge reserve to profit or loss Reclassified amount [1] ₩ 0 ₩ 0 ₩ 0
[1] The related account categories are presented in the amounts of interest rate swap assets and liabilities, currency forwards assets and liabilities and borrowings.
[2] Hedging ineffectiveness represents the difference between the changes in fair value of the hedging instruments and the hedged items.