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Derivatives - Nominal values and average hedge ratio for derivatives (Parenthetical) (Details)
Unit_pure in Thousands, ₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
KRW (₩)
Disclosure of detailed information about hedged items [line items]    
Proceeds from exercise of options   ₩ 324,027
USD    
Disclosure of detailed information about hedged items [line items]    
Average foreign exchange rate 1,307,410 1,280,520
JPY    
Disclosure of detailed information about hedged items [line items]    
Average foreign exchange rate 9,430 9,250
EUR    
Disclosure of detailed information about hedged items [line items]    
Average foreign exchange rate 1,487,330 1,402,370
GBP    
Disclosure of detailed information about hedged items [line items]    
Average foreign exchange rate 1,568,020 1,561,570
AUD    
Disclosure of detailed information about hedged items [line items]    
Average foreign exchange rate 896,370 892,940
CAD    
Disclosure of detailed information about hedged items [line items]    
Average foreign exchange rate 999,370 991,060
CNY    
Disclosure of detailed information about hedged items [line items]    
Average foreign exchange rate   189,500
SEK    
Disclosure of detailed information about hedged items [line items]    
Average foreign exchange rate 131,640 127,540