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Financial assets at FVTOCI - Details of equity securities designated as financial assets at FVTOCI (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Investments in equity instruments designated at fair value through other comprehensive income ₩ 1,427,885 ₩ 875,074
Fair value 10,913 155,868
Cumulative gain (loss) on disposal of investments in equity instruments designated at fair value through other comprehensive income 1,806 72,975
Investment for strategic business partnership purpose    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Investments in equity instruments designated at fair value through other comprehensive income ₩ 1,324,666 ₩ 766,900
Description of reason for using presentation alternative Investment for strategic business partnership purpose Investment for strategic business partnership purpose
Debt-equity swap    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Investments in equity instruments designated at fair value through other comprehensive income ₩ 103,219 ₩ 108,168
Description of reason for using presentation alternative Debt-equity swap Debt-equity swap
Others (Insurance for mutual aid association etc.)    
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]    
Investments in equity instruments designated at fair value through other comprehensive income ₩ 0 ₩ 6
Description of reason for using presentation alternative Others Others
Description of reason for acquiring of investments in equity instruments designated at fair value through other comprehensive income Insurance for mutual aid association etc.