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Financial risk management - Maturity analysis for non-derivative financial liabilities and off balance (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | ₩ 676,745,233 | ₩ 628,451,991
Deposits |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 457,143,665 | 431,731,514
Financial liabilities at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2,312,487 | 954,899
Borrowings |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 56,459,691 | 50,872,904
Debt securities issued |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 99,273,760 | 100,659,005
Financial liabilities designated at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 6,420,403 | 8,243,241
Investment contract liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,536,393 | 1,165,022
Other financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 53,598,834 | 34,825,406
Off balance |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 246,539,021 | 241,489,989
Guarantee contracts |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 26,221,968 | 22,509,195
Other liabilities related to loan commitments |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 220,317,053 | 218,980,794
Less than 1 month | Financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 308,564,962 | 268,707,535
Less than 1 month | Deposits |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 231,520,722 | 217,170,450
Less than 1 month | Financial liabilities at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2,212,215 | 954,899
Less than 1 month | Borrowings |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 16,797,623 | 12,862,532
Less than 1 month | Debt securities issued |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 6,230,564 | 4,859,511
Less than 1 month | Financial liabilities designated at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 399,298 | 439,367
Less than 1 month | Investment contract liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 189,704 | 106,106
Less than 1 month | Other financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 51,214,836 | 32,314,670
Less than 1 month | Off balance |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 246,539,021 | 241,489,989
Less than 1 month | Guarantee contracts |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 26,221,968 | 22,509,195
Less than 1 month | Other liabilities related to loan commitments |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 220,317,053 | 218,980,794
1~3 months |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 0 |
1~3 months | Financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 70,703,647 | 64,135,280
1~3 months | Deposits |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 54,103,105 | 49,309,656
1~3 months | Borrowings |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 6,963,957 | 4,757,090
1~3 months | Debt securities issued |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,486,174 | 8,927,081
1~3 months | Financial liabilities designated at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 977,019 | 861,277
1~3 months | Investment contract liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 10,554 | 105,788
1~3 months | Other financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 162,838 | 174,388
3~6 months |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 0 |
3~6 months | Financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 70,970,712 | 74,063,016
3~6 months | Deposits |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 54,526,232 | 56,540,309
3~6 months | Borrowings |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 6,221,726 | 6,901,957
3~6 months | Debt securities issued |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 9,202,855 | 9,122,810
3~6 months | Financial liabilities designated at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 854,498 | 991,871
3~6 months | Investment contract liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 91,041 | 248,954
3~6 months | Other financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 74,360 | 257,115
6 months ~ 1 year |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 0 |
6 months ~ 1 year | Financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 109,514,196 | 107,418,098
6 months ~ 1 year | Deposits |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 84,041,299 | 77,227,315
6 months ~ 1 year | Borrowings |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 8,478,193 | 9,990,468
6 months ~ 1 year | Debt securities issued |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 15,052,890 | 17,273,392
6 months ~ 1 year | Financial liabilities designated at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,180,049 | 1,963,789
6 months ~ 1 year | Investment contract liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 159,182 | 375,300
6 months ~ 1 year | Other financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 602,583 | 587,834
1~5 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 0 |
1~5 years | Financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 102,841,527 | 102,269,329
1~5 years | Deposits |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 30,677,571 | 30,221,968
1~5 years | Borrowings |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 11,924,157 | 11,464,431
1~5 years | Debt securities issued |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 56,411,740 | 56,429,636
1~5 years | Financial liabilities designated at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,423,212 | 2,473,275
1~5 years | Investment contract liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,085,912 | 328,874
1~5 years | Other financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,318,935 | 1,351,145
More than 5 years |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Off-balance, undiscounted cash flows | 0 |
More than 5 years | Financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 14,150,189 | 11,858,733
More than 5 years | Deposits |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 2,274,736 | 1,261,816
More than 5 years | Financial liabilities at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 100,272 |
More than 5 years | Borrowings |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 6,074,035 | 4,896,426
More than 5 years | Debt securities issued |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 3,889,537 | 4,046,575
More than 5 years | Financial liabilities designated at FVTPL |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | 1,586,327 | 1,513,662
More than 5 years | Other financial liabilities |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Non-derivative financial liabilities, undiscounted cash flows | ₩ 225,282 | ₩ 140,254

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