v3.26.1
Financial assets at FVTOCI - Changes in gross carrying amount of financial assets at FVTOCI (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Explanation of changes in gross carrying amount for financial assets at fair value through other comprehensive income [Line Items]      
Beginning balance ₩ 42,922,671    
Increase (decrease) in financial assets [abstract]      
Ending balance 82,071,637 ₩ 42,922,671  
Financial assets at fair value through other comprehensive income, category | Gross Carrying Amount      
Explanation of changes in gross carrying amount for financial assets at fair value through other comprehensive income [Line Items]      
Beginning balance 42,922,671 36,694,111 ₩ 32,145,758
Increase (decrease) in financial assets [abstract]      
Transfer to 12-month expected credit losses 0 0 0
Transfer to lifetime expected credit losses 0 0 0
Transfer to credit-impaired financial assets 0 0 0
Acquisition 43,438,838 31,921,268 24,350,759
Disposal / Repayment (35,030,082) (26,868,486) (20,823,293)
Gain (loss) on valuation (1,956,928) 224,898 707,739
Amortization based on effective interest method 216,191 134,553 166,401
Changes due to business combinations 32,515,016    
Others [1] (34,069) 816,327 146,747
Ending balance 82,071,637 42,922,671 36,694,111
Financial assets at fair value through other comprehensive income, category | Stage 1 | Gross Carrying Amount      
Explanation of changes in gross carrying amount for financial assets at fair value through other comprehensive income [Line Items]      
Beginning balance 42,922,671 36,694,111 32,145,758
Increase (decrease) in financial assets [abstract]      
Transfer to 12-month expected credit losses 0 0 0
Transfer to lifetime expected credit losses 0 0 0
Transfer to credit-impaired financial assets 0 0 0
Acquisition 43,438,838 31,921,268 24,350,759
Disposal / Repayment (35,030,082) (26,868,486) (20,823,293)
Gain (loss) on valuation (1,956,928) 224,898 707,739
Amortization based on effective interest method 216,191 134,553 166,401
Changes due to business combinations 32,515,016    
Others [1] (34,069) 816,327 146,747
Ending balance 82,071,637 42,922,671 36,694,111
Financial assets at fair value through other comprehensive income, category | Lifetime expected credit losses | Stage 2 | Gross Carrying Amount      
Explanation of changes in gross carrying amount for financial assets at fair value through other comprehensive income [Line Items]      
Beginning balance 0 0 0
Increase (decrease) in financial assets [abstract]      
Transfer to 12-month expected credit losses 0 0 0
Transfer to lifetime expected credit losses 0 0 0
Transfer to credit-impaired financial assets 0 0 0
Acquisition 0 0 0
Disposal / Repayment 0 0 0
Gain (loss) on valuation 0 0 0
Amortization based on effective interest method 0 0 0
Changes due to business combinations 0    
Others [1] 0 0 0
Ending balance 0 0 0
Financial assets at fair value through other comprehensive income, category | Lifetime expected credit losses | Stage 3 | Gross Carrying Amount      
Explanation of changes in gross carrying amount for financial assets at fair value through other comprehensive income [Line Items]      
Beginning balance 0 0 0
Increase (decrease) in financial assets [abstract]      
Transfer to 12-month expected credit losses 0 0 0
Transfer to lifetime expected credit losses 0 0 0
Transfer to credit-impaired financial assets 0 0 0
Acquisition 0 0 0
Disposal / Repayment 0 0 0
Gain (loss) on valuation 0 0 0
Amortization based on effective interest method 0 0 0
Changes due to business combinations 0    
Others [1] 0 0 0
Ending balance ₩ 0 ₩ 0 ₩ 0
[1] Others consist of foreign currencies translation, etc.