v3.26.1
Derivatives - Summary Of Amounts Related To Items Designated As Hedging Instruments (Details)
₩ in Millions
12 Months Ended
Dec. 31, 2025
KRW (₩)
USD ($)
Dec. 31, 2024
KRW (₩)
USD ($)
EUR (€)
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
AUD ($)
Dec. 31, 2025
GBP (£)
Dec. 31, 2025
SEK (kr)
Dec. 31, 2025
JPY (¥)
Dec. 31, 2025
CAD ($)
Disclosure of detailed information about hedging instruments [line items]                  
Description of line item in statement of financial position where the hedging instrument is located Derivatives held for trading are classified into financial assets at FVTPL (Note 8) and financial liabilities at FVTPL (Note 21), and derivatives designated for hedging are presented as a separate line item in the consolidated statements of financial position. Derivatives held for trading are classified into financial assets at FVTPL (Note 8) and financial liabilities at FVTPL (Note 21), and derivatives designated for hedging are presented as a separate line item in the consolidated statements of financial position.              
Foreign currencies translation risk and interest rate risk | Currency swap | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $   870,000,000              
Foreign currencies translation risk | Currency swap | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $   100,000,000              
Foreign currencies translation risk | Currency swap | EUR                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | €   194,780,000              
For fair value hedging | Interest rate risk | Interest rate swap | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $ 2,650,000,000 2,675,000,000              
Carrying amounts of the hedging instrument, assets   ₩ 10,102 ₩ 37,010            
Carrying amounts of the hedging instrument, liabilities   ₩ 102,635 ₩ 27,050            
Description of line item in statement of financial position where the hedging instrument is located Derivative assets (designated for hedging) Derivative liabilities (designated for hedging) Derivative assets (designated for hedging) Derivative liabilities (designated for hedging)              
Changing in fair value used for calculating hedge ineffectiveness ₩ 93,549 ₩ 5,265              
For fair value hedging | Interest rate risk | Interest rate swap | KRW                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 290,000 155,000 290,000            
For fair value hedging | Foreign currencies translation risk | Currency forward | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $ 479,859,358                
Carrying amounts of the hedging instrument, assets     ₩ 1,201            
Carrying amounts of the hedging instrument, liabilities     40,408            
Description of line item in statement of financial position where the hedging instrument is located Derivative assets (designated for hedging) Derivative liabilities (designated for hedging)                
Changing in fair value used for calculating hedge ineffectiveness ₩ (252,432)                
For fair value hedging | Foreign currencies translation risk | Currency forward | EUR                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 72,961,301     72,961,301          
Carrying amounts of the hedging instrument, assets     0            
Carrying amounts of the hedging instrument, liabilities     13,904            
Changing in fair value used for calculating hedge ineffectiveness ₩ 44,644                
For fair value hedging | Foreign currencies translation risk | Currency forward | AUD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 235,764,330       235,764,330        
Carrying amounts of the hedging instrument, assets     0            
Carrying amounts of the hedging instrument, liabilities     15,575            
Changing in fair value used for calculating hedge ineffectiveness ₩ (23,061)                
For fair value hedging | Foreign currencies translation risk | Currency forward | GBP                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 15,700,000         15,700,000      
Carrying amounts of the hedging instrument, assets     0            
Carrying amounts of the hedging instrument, liabilities     ₩ 1,101            
Description of line item in statement of financial position where the hedging instrument is located Derivative liabilities (designated for hedging)                
Changing in fair value used for calculating hedge ineffectiveness ₩ (1,408)                
For cash flow hedging | Interest rate risk | Interest rate swap | KRW                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 60,000 140,000 60,000            
Carrying amounts of the hedging instrument, assets   ₩ 0 ₩ 903            
Carrying amounts of the hedging instrument, liabilities   ₩ 180 0            
Description of line item in statement of financial position where the hedging instrument is located   Derivative assets (designated for hedging)              
Changing in fair value used for calculating hedge ineffectiveness ₩ 1,084 ₩ 211              
For cash flow hedging | Interest rate risk | Interest Forward | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $ 320,000,000                
Carrying amounts of the hedging instrument, assets     4,848            
Carrying amounts of the hedging instrument, liabilities     27            
Description of line item in statement of financial position where the hedging instrument is located Derivative assets (designated for hedging) Derivative liabilities (designated for hedging)                
Changing in fair value used for calculating hedge ineffectiveness ₩ 3,732                
For cash flow hedging | Interest rate risk | Interest Forward | KRW                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $ 2,010,000                
Carrying amounts of the hedging instrument, assets     2,344            
Carrying amounts of the hedging instrument, liabilities     139,313            
Changing in fair value used for calculating hedge ineffectiveness ₩ (203,153)                
For cash flow hedging | Foreign currencies translation risk and interest rate risk | Currency swap | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $ 806,833,334 870,000,000              
Carrying amounts of the hedging instrument, assets   ₩ 104,320 51,040            
Carrying amounts of the hedging instrument, liabilities   ₩ 0 11,984            
Description of line item in statement of financial position where the hedging instrument is located Derivative assets (designated for hedging) Derivative liabilities (designated for hedging) Derivative assets (designated for hedging) Derivative liabilities (designated for hedging)              
Changing in fair value used for calculating hedge ineffectiveness ₩ (69,611) ₩ 110,714              
For cash flow hedging | Foreign currencies translation risk and interest rate risk | Currency swap | EUR                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 166,900,000     166,900,000          
Carrying amounts of the hedging instrument, assets     1,012            
Carrying amounts of the hedging instrument, liabilities     16,086            
Description of line item in statement of financial position where the hedging instrument is located Derivative liabilities (designated for hedging)                
Changing in fair value used for calculating hedge ineffectiveness ₩ (9,085)                
For cash flow hedging | Foreign currencies translation risk and interest rate risk | Currency swap | AUD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 80,000,000       80,000,000        
Carrying amounts of the hedging instrument, assets     605            
Carrying amounts of the hedging instrument, liabilities     632            
Changing in fair value used for calculating hedge ineffectiveness ₩ (5,494)                
For cash flow hedging | Foreign currencies translation risk and interest rate risk | Currency swap | JPY                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 5,000,000,000             5,000,000,000  
Carrying amounts of the hedging instrument, assets     819            
Carrying amounts of the hedging instrument, liabilities     0            
Changing in fair value used for calculating hedge ineffectiveness ₩ 819                
For cash flow hedging | Foreign currencies translation risk and interest rate risk | Currency swap | SEK                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 599,000,000           599,000,000    
Carrying amounts of the hedging instrument, assets     855            
Carrying amounts of the hedging instrument, liabilities     9,468            
Changing in fair value used for calculating hedge ineffectiveness ₩ (7,678)                
For cash flow hedging | Foreign currencies translation risk | Currency swap | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $ 657,884,000 100,000,000              
Carrying amounts of the hedging instrument, assets   ₩ 29,861 30,780            
Carrying amounts of the hedging instrument, liabilities   ₩ 0 27,168            
Description of line item in statement of financial position where the hedging instrument is located   Derivative assets (designated for hedging)              
Changing in fair value used for calculating hedge ineffectiveness ₩ (74,613) ₩ 18,623              
For cash flow hedging | Foreign currencies translation risk | Currency swap | EUR                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 1,206,780,000 194,780,000   1,206,780,000          
Carrying amounts of the hedging instrument, assets   ₩ 30,908 72,261            
Carrying amounts of the hedging instrument, liabilities   ₩ 0 60,932            
Description of line item in statement of financial position where the hedging instrument is located   Derivative assets (designated for hedging)              
Changing in fair value used for calculating hedge ineffectiveness ₩ (16,952) ₩ 22,512              
For cash flow hedging | Foreign currencies translation risk | Currency swap | AUD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 215,000,000       215,000,000        
Carrying amounts of the hedging instrument, assets     0            
Carrying amounts of the hedging instrument, liabilities     13,220            
Changing in fair value used for calculating hedge ineffectiveness ₩ (15,574)                
For cash flow hedging | Foreign currencies translation risk | Currency swap | JPY                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 65,000,000,000             65,000,000,000  
Carrying amounts of the hedging instrument, assets     10,943            
Carrying amounts of the hedging instrument, liabilities     1,814            
Changing in fair value used for calculating hedge ineffectiveness ₩ 8,981                
For cash flow hedging | Foreign currencies translation risk | Currency swap | CAD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 40,000,000               40,000,000
Carrying amounts of the hedging instrument, assets     339            
Carrying amounts of the hedging instrument, liabilities     0            
Changing in fair value used for calculating hedge ineffectiveness ₩ 334                
For cash flow hedging | Foreign currencies translation risk | Currency forward | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $ 1,698,449,733                
Carrying amounts of the hedging instrument, assets     2,221            
Carrying amounts of the hedging instrument, liabilities     127,924            
Description of line item in statement of financial position where the hedging instrument is located Derivative assets (designated for hedging) Derivative liabilities (designated for hedging)                
Changing in fair value used for calculating hedge ineffectiveness ₩ 13,389                
For cash flow hedging | Foreign currencies translation risk | Currency forward | EUR                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 607,322,500     607,322,500          
Carrying amounts of the hedging instrument, assets     0            
Carrying amounts of the hedging instrument, liabilities     89,586            
Changing in fair value used for calculating hedge ineffectiveness ₩ (10,747)                
For cash flow hedging | Foreign currencies translation risk | Currency forward | AUD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument 259,970,000       259,970,000        
Carrying amounts of the hedging instrument, assets     0            
Carrying amounts of the hedging instrument, liabilities     19,167            
Changing in fair value used for calculating hedge ineffectiveness ₩ (350)                
Hedges of net investment in foreign operations | Exchange risk | Foreign currency bond (USD) | USD                  
Disclosure of detailed information about hedging instruments [line items]                  
Nominal amount of the hedging instrument | $ 863,959,317 863,959,317              
Carrying amounts of the hedging instrument, assets   ₩ 0 0            
Carrying amounts of the hedging instrument, liabilities   ₩ 1,270,020 ₩ 1,239,695            
Description of line item in statement of financial position where the hedging instrument is located Foreign currency bond Foreign currency denominated debentures              
Changing in fair value used for calculating hedge ineffectiveness ₩ 30,325 ₩ (156,015)