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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
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.