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Derivatives - Nominal values and average hedge ratio for derivatives (Details) - d
d in Millions
Dec. 31, 2025
Dec. 31, 2024
Interest rate risk    
Disclosure of detailed information about hedged items [line items]    
Notional values 13,612,757 13,219,417
Average price condition 1.34% [1] 3.82% [2]
Average hedge ratio 100.00% 100.00%
Interest rate risk | 1 year or less    
Disclosure of detailed information about hedged items [line items]    
Notional values 2,485,060 910,440
Average price condition 1.86% [1] 3.43% [2]
Average hedge ratio 100.00% 100.00%
Interest rate risk | 1~2 years [member]    
Disclosure of detailed information about hedged items [line items]    
Notional values 2,219,475 2,621,365
Average price condition 1.60% [1] 3.07% [2]
Average hedge ratio 100.00% 100.00%
Interest rate risk | 2~3 years [member]    
Disclosure of detailed information about hedged items [line items]    
Notional values 2,553,701 1,943,818
Average price condition 1.75% [1] 4.08% [2]
Average hedge ratio 100.00% 100.00%
Interest rate risk | 3~4 years    
Disclosure of detailed information about hedged items [line items]    
Notional values 2,008,399 2,350,027
Average price condition 1.73% [1] 4.82% [2]
Average hedge ratio 100.00% 100.00%
Interest rate risk | 4~5 years    
Disclosure of detailed information about hedged items [line items]    
Notional values 450,481 1,161,927
Average price condition 1.14% [1] 4.17% [2]
Average hedge ratio 100.00% 100.00%
Interest rate risk | More than 5 years    
Disclosure of detailed information about hedged items [line items]    
Notional values 3,895,641 4,231,840
Average price condition 0.42% [1] 3.60% [2]
Average hedge ratio 100.00% 100.00%
Exchange risk    
Disclosure of detailed information about hedged items [line items]    
Notional values 14,668,335 [3] 14,191,213 [4]
Average hedge ratio 100.00% [3] 100.00% [4]
Exchange risk | 1 year or less    
Disclosure of detailed information about hedged items [line items]    
Notional values 4,344,598 [3] 4,319,632 [4]
Average hedge ratio 100.00% [3] 100.00% [4]
Exchange risk | 1~2 years [member]    
Disclosure of detailed information about hedged items [line items]    
Notional values 3,288,511 [3] 2,421,806 [4]
Average hedge ratio 100.00% [3] 100.00% [4]
Exchange risk | 2~3 years [member]    
Disclosure of detailed information about hedged items [line items]    
Notional values 3,353,841 [3] 3,072,483 [4]
Average hedge ratio 100.00% [3] 100.00% [4]
Exchange risk | 3~4 years    
Disclosure of detailed information about hedged items [line items]    
Notional values 1,941,689 [3] 2,870,442 [4]
Average hedge ratio 100.00% [3] 100.00% [4]
Exchange risk | 4~5 years    
Disclosure of detailed information about hedged items [line items]    
Notional values 992,587 [3] 1,059,147 [4]
Average hedge ratio 100.00% [3] 100.00% [4]
Exchange risk | More than 5 years    
Disclosure of detailed information about hedged items [line items]    
Notional values 747,109 [3] 447,703 [4]
Average hedge ratio 100.00% [3] 100.00% [4]
Other price risk [member]    
Disclosure of detailed information about hedged items [line items]    
Notional values [5]   18,750
Average hedge ratio [5]   100.00%
Other price risk [member] | 1 year or less    
Disclosure of detailed information about hedged items [line items]    
Notional values [5]   0
Average hedge ratio [5]   0.00%
Other price risk [member] | 1~2 years [member]    
Disclosure of detailed information about hedged items [line items]    
Notional values [5]   0
Average hedge ratio [5]   0.00%
Other price risk [member] | 2~3 years [member]    
Disclosure of detailed information about hedged items [line items]    
Notional values [5]   18,750
Average hedge ratio [5]   100.00%
Other price risk [member] | 3~4 years    
Disclosure of detailed information about hedged items [line items]    
Notional values [5]   0
Average hedge ratio [5]   0.00%
Other price risk [member] | 4~5 years    
Disclosure of detailed information about hedged items [line items]    
Notional values [5]   0
Average hedge ratio [5]   0.00%
Other price risk [member] | More than 5 years    
Disclosure of detailed information about hedged items [line items]    
Notional values [5]   0
Average hedge ratio [5]   0.00%
[1] Interest rate swaps consist of 3M CD, USD SOFR, 3M USD Libor, 3M Euribor, 3M AUD Bond and 3M JPY TONAR.
[2] Interest rate swaps consist of 3M CD, USD SOFR, 3M Euribor, and 3M AUD Bond.
[3] The average exchange rates of net investment hedge instruments are USD/KRW 1,307.41, JPY/KRW 9.43, EUR/KRW 1,487.33, GBP/KRW 1,568.02, AUD/KRW 896.37, CAD/KRW 999.37 and SEK/KRW 131.64.
[4] The average exchange rates of net investment hedge instruments are USD/KRW 1,280.52, JPY/KRW 9.25, EUR/KRW 1,402.37, GBP/KRW 1,561.57, AUD/KRW 892.94, CAD/KRW 991.06, CNY/KRW 189.50, SEK/KRW 127.54.
[5] The equity option, which has an exercise price of W 324,027.