v3.26.1
Derivatives - Summary Of Carrying Amounts Of Hedged Item And Amount Of Hedge Adjustments Due To Hedge Accounting (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
For fair value hedging | Interest rate risk | Debentures    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets ₩ 0 [1] ₩ 0 [2]
Carrying amounts of the hedging item, liabilities 4,046,624 [1] 3,952,047 [2]
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0 [1] 0 [2]
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 36,892 [1] ₩ 129,306 [2]
Line item in the statement of financial position in which the hedged item is included Debentures [1] Debentures [2]
Changing in fair value used for calculating hedge ineffectiveness ₩ (80,760) [1] ₩ (17,417) [2]
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] 0 [1] 0 [4]
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 36,892 [1] 129,306 [2]
For fair value hedging | Interest rate risk | Debentures on foreign currency as hedged items [member]    
Disclosure of detailed information about hedged items [line items]    
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities 29,538 124,647
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 29,538 124,647
For fair value hedging | Interest rate risk | Debentures on local currency as hedged items [member]    
Disclosure of detailed information about hedged items [line items]    
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities 7,354 4,659
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 7,354 4,659
For fair value hedging | Foreign currencies translation risk    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 226,555  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets (4,121)  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0  
Line item in the statement of financial position in which the hedged item is included FTVPL  
Changing in fair value used for calculating hedge ineffectiveness ₩ 70,015  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] 0  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
For fair value hedging | Foreign currencies translation risk | Foreign private bonds    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 76,793  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets (7,717)  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0  
Line item in the statement of financial position in which the hedged item is included Financial assetsat amortized cost  
Changing in fair value used for calculating hedge ineffectiveness ₩ 6,567  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] 0  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
For fair value hedging | Foreign currencies translation risk | Foreign currency securities    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 569,122  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 131,018  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0  
Line item in the statement of financial position in which the hedged item is included FVTOCI  
Changing in fair value used for calculating hedge ineffectiveness ₩ 169,469  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] 0  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
For cash flow hedging | Interest rate risk | Debentures    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 0 0
Carrying amounts of the hedging item, liabilities 59,952 139,987
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0 0
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0 ₩ 0
Line item in the statement of financial position in which the hedged item is included Debentures Debentures
Changing in fair value used for calculating hedge ineffectiveness ₩ (1,083) ₩ (211)
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied 655 [3] (133) [4]
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0 0
For cash flow hedging | Interest rate risk | Anticipated bond purchase    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 0  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities 0  
Changing in fair value used for calculating hedge ineffectiveness 183,177  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] (150,651)  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
For cash flow hedging | Foreign currencies translation risk and interest rate risk    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 55,671  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0  
Line item in the statement of financial position in which the hedged item is included FTVPL  
Changing in fair value used for calculating hedge ineffectiveness ₩ (321)  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] (77)  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
For cash flow hedging | Foreign currencies translation risk and interest rate risk | Debentures    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 0 0
Carrying amounts of the hedging item, liabilities 878,855 1,275,768
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0 0
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0 ₩ 0
Line item in the statement of financial position in which the hedged item is included Debentures Debentures
Changing in fair value used for calculating hedge ineffectiveness ₩ 53,508 ₩ (110,714)
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied (188) [3] (7,825) [4]
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0 0
For cash flow hedging | Foreign currencies translation risk and interest rate risk | Foreign private bonds    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 176,540  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0  
Line item in the statement of financial position in which the hedged item is included Financial assetsat amortized cost  
Changing in fair value used for calculating hedge ineffectiveness ₩ 11,016  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] (1,722)  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
For cash flow hedging | Foreign currencies translation risk and interest rate risk | Foreign currency securities    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 256,487  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0  
Line item in the statement of financial position in which the hedged item is included FVTOCI  
Changing in fair value used for calculating hedge ineffectiveness ₩ 13,062  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] (1,105)  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
For cash flow hedging | Foreign currencies translation risk    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 605,631  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0  
Line item in the statement of financial position in which the hedged item is included FTVPL  
Changing in fair value used for calculating hedge ineffectiveness ₩ (13,091)  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] (321)  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
For cash flow hedging | Foreign currencies translation risk | Debentures    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 0 0
Carrying amounts of the hedging item, liabilities 471,707 444,345
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0 0
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0 ₩ 0
Line item in the statement of financial position in which the hedged item is included Debentures Debentures
Changing in fair value used for calculating hedge ineffectiveness ₩ (33,199) ₩ (41,134)
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied (2,242) [3] (7,479) [4]
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0 0
For cash flow hedging | Foreign currencies translation risk | Foreign currency securities    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 4,996,548  
Carrying amounts of the hedging item, liabilities 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0  
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0  
Line item in the statement of financial position in which the hedged item is included FVTOCI  
Changing in fair value used for calculating hedge ineffectiveness ₩ 141,426  
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied [3] (26,141)  
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 0  
Hedges of net investment in foreign operations | Exchange risk | Foreign currency bond    
Disclosure of detailed information about hedged items [line items]    
Carrying amounts of the hedging item, assets 0 0
Carrying amounts of the hedging item, liabilities 1,239,695 1,270,020
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, assets 0 0
Accumulated amount of fair value hedge adjustments on the hedged item included in the carrying amount of the hedged item, liabilities ₩ 0 ₩ 0
Line item in the statement of financial position in which the hedged item is included Foreignoperations netasset Foreign operations net asset
Changing in fair value used for calculating hedge ineffectiveness ₩ (30,325) ₩ 156,015
Reserve of cash flow hedges, hedging relationships for which hedge accounting is no longer applied (127,258) [3] (149,577) [4]
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities ₩ 0 ₩ 0
[1] The accumulated profit on debentures on foreign currency amounted to 29,538 million Won, and the accumulated profit on debentures on local currency amounted to 7,354 million Won, as of December 31, 2025.
[2] The accumulated profit on debentures on foreign currency amounted to 124,647 million Won, and the accumulated loss on debentures on local currency amounted to 4,659 million Won, as of December 31, 2024.
[3] After tax amount.
[4] The accumulated profit on debentures on foreign currency amounted to 141,818 million Won, and the accumulated loss on debentures on local currency amounted to 1,084 million Won, as of December 31, 2023.