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Financial risk management - Carrying value and the fair value of financial instruments measured at amortized cost (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Securities at amortized cost: |  |  |
Other financial assets |  | ₩ 43,323,340 | ₩ 23,116,960
Deposit liabilities |  |  |
Deposit liabilities |  | 447,648,971 | 422,781,045
Borrowing debts: |  |  |
Borrowings |  | 55,394,834 | 49,920,373
Debts: |  |  |
Investment contract liabilities |  | 1,536,393 | 1,165,022
Other financial liabilities |  | 57,890,911 | 39,472,400
Financial liabilities at amortized cost, Total | [1] | 1,536,393 | 1,165,022
Fair value |  |  |
Assets: |  |  |
Deposits at amortized cost |  | 36,793,298 | 38,159,135
Loans at amortized cost: |  |  |
Loans at amortized cost |  | 466,291,620 | 452,724,752
Securities at amortized cost: |  |  |
Government bonds |  | 22,300,505 | 21,625,666
Financial institution bonds |  | 1,851,292 | 3,828,599
Corporation bonds |  | 7,239,123 | 7,694,086
Securities at amortized cost |  | 31,390,920 | 33,148,351
Other financial assets |  | 43,674,984 | 23,469,322
Financial assets at amortized cost, Total |  | 578,150,822 | 547,501,560
Deposit liabilities |  |  |
Demand deposits |  | 172,840,773 | 160,031,759
Time deposits |  | 238,238,605 | 236,878,216
Certificate of deposit |  | 16,970,158 | 10,481,318
Issued bill deposit |  | 8,920,096 | 7,624,245
CMA Deposits |  | 4,889,093 | 4,451,561
Others |  | 5,668,466 | 3,735,726
Deposit liabilities |  | 447,527,191 | 423,202,825
Borrowing debts: |  |  |
Call-money |  | 1,437,100 | 1,197,823
Bills sold |  | 11,846 | 8,831
Bonds sold under repurchase agreements |  | 14,988,698 | 11,542,956
Borrowings |  | 38,924,550 | 37,236,104
Borrowings debts |  | 55,362,194 | 49,985,714
Debts: |  |  |
Borrowings in won |  | 74,697,509 | 75,610,971
Borrowings in foreign currency |  | 18,273,309 | 18,759,433
Debt |  | 92,970,818 | 94,370,404
Investment contract liabilities |  | 1,536,393 | 1,165,022
Other financial liabilities |  | 57,832,606 | 39,429,575
Financial liabilities at amortized cost, Total |  | 655,229,202 | 608,153,540
Carrying value |  |  |
Assets: |  |  |
Deposits at amortized cost |  | 36,859,627 | 38,228,750
Loans at amortized cost: |  |  |
Loans at amortized cost |  | 464,773,880 | 449,295,238
Securities at amortized cost: |  |  |
Government bonds |  | 22,779,176 | 21,808,057
Financial institution bonds |  | 1,837,790 | 3,787,661
Corporation bonds |  | 7,327,402 | 7,720,281
Securities at amortized cost |  | 31,944,368 | 33,315,999
Other financial assets |  | 43,323,340 | 23,116,960
Financial assets at amortized cost, Total |  | 576,901,215 | 543,956,947
Deposit liabilities |  |  |
Demand deposits |  | 172,840,773 | 160,031,759
Time deposits |  | 238,328,250 | 236,527,490
Certificate of deposit |  | 17,001,339 | 10,409,701
Issued bill deposit |  | 8,921,064 | 7,624,787
CMA Deposits |  | 4,889,093 | 4,451,561
Others |  | 5,668,452 | 3,735,747
Deposit liabilities |  | 447,648,971 | 422,781,045
Borrowing debts: |  |  |
Call-money |  | 1,437,100 | 1,197,823
Bills sold |  | 11,887 | 8,872
Bonds sold under repurchase agreements |  | 14,988,698 | 11,542,956
Borrowings |  | 38,957,149 | 37,170,722
Borrowings debts |  | 55,394,834 | 49,920,373
Debts: |  |  |
Borrowings in won |  | 74,937,216 | 75,106,885
Borrowings in foreign currency |  | 18,054,206 | 18,658,969
Debt |  | 92,991,422 | 93,765,854
Investment contract liabilities |  | 1,536,393 | 1,165,022
Other financial liabilities |  | 57,890,911 | 39,472,400
Financial liabilities at amortized cost, Total |  | 655,462,531 | 607,104,694
Level 1 |  |  |
Assets: |  |  |
Deposits at amortized cost |  | 269,329 | 537,760
Securities at amortized cost: |  |  |
Government bonds |  | 10,815,330 | 11,292,066
Financial institution bonds |  | 80,367 | 331,421
Securities at amortized cost |  | 10,895,697 | 11,623,487
Financial assets at amortized cost, Total |  | 11,165,026 | 12,161,247
Level 2 |  |  |
Assets: |  |  |
Deposits at amortized cost |  | 36,523,969 | 37,621,375
Loans at amortized cost: |  |  |
Loans at amortized cost |  | 700,039 | 965,455
Securities at amortized cost: |  |  |
Government bonds |  | 11,485,175 | 10,333,600
Financial institution bonds |  | 1,770,925 | 3,497,178
Corporation bonds |  | 7,239,123 | 7,694,086
Securities at amortized cost |  | 20,495,223 | 21,524,864
Other financial assets |  | 29,465,771 | 13,474,763
Financial assets at amortized cost, Total |  | 87,185,002 | 73,586,457
Deposit liabilities |  |  |
Demand deposits |  | 172,840,773 | 160,031,759
CMA Deposits |  | 4,889,093 | 4,451,561
Others |  | 5,625,593 | 3,694,921
Deposit liabilities |  | 183,355,459 | 168,178,241
Borrowing debts: |  |  |
Call-money |  | 1,437,100 | 1,197,823
Borrowings |  | 108,795 | 19,922
Borrowings debts |  | 1,545,895 | 1,217,745
Debts: |  |  |
Borrowings in won |  | 40,127,224 | 43,460,315
Borrowings in foreign currency |  | 12,618,554 | 12,899,498
Debt |  | 52,745,778 | 56,359,813
Other financial liabilities |  | 22,535,595 | 10,428,026
Financial liabilities at amortized cost, Total |  | 260,182,727 | 236,183,825
Level 3 |  |  |
Loans at amortized cost: |  |  |
Loans at amortized cost |  | 465,591,581 | 451,759,297
Securities at amortized cost: |  |  |
Other financial assets |  | 14,209,213 | 9,994,559
Financial assets at amortized cost, Total |  | 479,800,794 | 461,753,856
Deposit liabilities |  |  |
Time deposits |  | 238,238,605 | 236,878,216
Certificate of deposit |  | 16,970,158 | 10,481,318
Issued bill deposit |  | 8,920,096 | 7,624,245
Others |  | 42,873 | 40,805
Deposit liabilities |  | 264,171,732 | 255,024,584
Borrowing debts: |  |  |
Bills sold |  | 11,846 | 8,831
Bonds sold under repurchase agreements |  | 14,988,698 | 11,542,956
Borrowings |  | 38,815,755 | 37,216,182
Borrowings debts |  | 53,816,299 | 48,767,969
Debts: |  |  |
Borrowings in won |  | 34,570,285 | 32,150,656
Borrowings in foreign currency |  | 5,654,755 | 5,859,935
Debt |  | 40,225,040 | 38,010,591
Investment contract liabilities |  | 1,536,393 | 1,165,022
Other financial liabilities |  | 35,297,011 | 29,001,549
Financial liabilities at amortized cost, Total |  | ₩ 395,046,475 | ₩ 371,969,715
[1] | This is retirement pension policyholder reserve.

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