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Derivatives - Nominal values and average hedge ratio for derivatives (Details) - d d in Millions | Dec. 31, 2025 | Dec. 31, 2024
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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.

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