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Financial risk management - Concentration by industry sector of financial instrument, net of allowance (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | ₩ 715,198,707 | ₩ 692,184,971
Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 501,633,507 | 487,523,988
Due from banks and loans at amortized cost | Banks |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 12,658,709 | 14,058,051
Due from banks and loans at amortized cost | Retail |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 208,308,298 | 199,809,576
Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 26,417,332 | 27,228,308
Due from banks and loans at amortized cost | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 226,554,125 | 218,713,457
Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 27,695,043 | 27,714,596
Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,456,116 | 1,915,396
Deposits and loans at FVTPL | Banks |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 169,972 | 134,609
Deposits and loans at FVTPL | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,286,144 | 1,780,787
Securities at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 71,727,860 | 67,134,121
Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,153,950 | 10,279,257
Financial assets at FVOCI |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 101,282,906 | 92,016,210
Securities at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 31,944,368 | 33,315,999
Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 26,221,968 | 22,509,195
Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 220,317,053 | 218,980,794
Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 246,539,021 | 241,489,989
Finance and insurance |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 155,648,429 | 152,116,226
Finance and insurance | Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 61,101,394 | 63,104,471
Finance and insurance | Due from banks and loans at amortized cost | Banks |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 12,359,288 | 13,495,577
Finance and insurance | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 26,140,603 | 27,042,097
Finance and insurance | Due from banks and loans at amortized cost | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 22,523,203 | 22,485,184
Finance and insurance | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 78,300 | 81,613
Finance and insurance | Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 616,340 | 894,745
Finance and insurance | Deposits and loans at FVTPL | Banks |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 40,862 | 35,450
Finance and insurance | Deposits and loans at FVTPL | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 575,478 | 859,295
Finance and insurance | Securities at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 35,054,770 | 34,194,979
Finance and insurance | Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 6,068,491 | 8,305,868
Finance and insurance | Financial assets at FVOCI |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 45,699,181 | 35,854,914
Finance and insurance | Securities at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,108,253 | 9,761,249
Finance and insurance | Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 5,659,966 | 3,733,957
Finance and insurance | Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 18,227,705 | 18,218,204
Finance and insurance | Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 23,887,671 | 21,952,161
Manufacturing |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 70,255,732 | 70,470,804
Manufacturing | Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 63,684,109 | 62,524,251
Manufacturing | Due from banks and loans at amortized cost | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 63,353,165 | 62,200,259
Manufacturing | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 330,944 | 323,992
Manufacturing | Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 399,668 | 391,667
Manufacturing | Deposits and loans at FVTPL | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 399,668 | 391,667
Manufacturing | Securities at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,090,284 | 3,634,273
Manufacturing | Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 829,304 | 1,263,951
Manufacturing | Financial assets at FVOCI |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,242,382 | 2,636,678
Manufacturing | Securities at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 9,985 | 19,984
Manufacturing | Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 12,554,311 | 11,712,348
Manufacturing | Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 31,211,151 | 34,199,306
Manufacturing | Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 43,765,462 | 45,911,654
Retail and wholesale |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 25,914,599 | 26,064,007
Retail and wholesale | Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 24,033,515 | 23,736,315
Retail and wholesale | Due from banks and loans at amortized cost | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 23,759,226 | 23,447,863
Retail and wholesale | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 274,289 | 288,452
Retail and wholesale | Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,004 | 301,658
Retail and wholesale | Deposits and loans at FVTPL | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,004 | 301,658
Retail and wholesale | Securities at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,399,374 | 1,286,997
Retail and wholesale | Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 13,573 | 26,101
Retail and wholesale | Financial assets at FVOCI |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 465,133 | 712,936
Retail and wholesale | Securities at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net |  | 0
Retail and wholesale | Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,633,251 | 3,548,909
Retail and wholesale | Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 10,863,979 | 10,324,128
Retail and wholesale | Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 14,497,230 | 13,873,037
Real estate and business |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 53,328,855 | 51,842,977
Real estate and business | Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 47,487,103 | 47,174,940
Real estate and business | Due from banks and loans at amortized cost | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 47,411,346 | 47,109,684
Real estate and business | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 75,757 | 65,256
Real estate and business | Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 156,286 | 149,652
Real estate and business | Deposits and loans at FVTPL | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 156,286 | 149,652
Real estate and business | Securities at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,087,667 | 2,149,229
Real estate and business | Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 19,948 | 39,698
Real estate and business | Financial assets at FVOCI |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,733,913 | 1,790,042
Real estate and business | Securities at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 843,938 | 539,416
Real estate and business | Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 290,565 | 92,172
Real estate and business | Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 6,914,971 | 4,325,044
Real estate and business | Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,205,536 | 4,417,216
Construction service |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,188,187 | 7,197,010
Construction service | Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 5,813,211 | 5,460,846
Construction service | Due from banks and loans at amortized cost | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 5,764,311 | 5,409,739
Construction service | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 48,900 | 51,107
Construction service | Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 99,327 | 109,159
Construction service | Deposits and loans at FVTPL | Banks |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 99,327 | 99,159
Construction service | Deposits and loans at FVTPL | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net |  | 10,000
Construction service | Securities at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 242,695 | 304,020
Construction service | Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,272 | 6,003
Construction service | Financial assets at FVOCI |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 749,831 | 1,056,603
Construction service | Securities at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 280,851 | 260,379
Construction service | Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 214,178 | 179,255
Construction service | Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,269,120 | 2,408,759
Construction service | Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,483,298 | 2,588,014
Lodging and Restaurant |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,285,666 | 6,906,269
Lodging and Restaurant | Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,233,718 | 6,756,129
Lodging and Restaurant | Due from banks and loans at amortized cost | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,205,522 | 6,735,852
Lodging and Restaurant | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 28,196 | 20,277
Lodging and Restaurant | Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 0 | 0
Lodging and Restaurant | Securities at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 29,279 | 136,364
Lodging and Restaurant | Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 329 | 1,616
Lodging and Restaurant | Financial assets at FVOCI |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 22,340 | 12,160
Lodging and Restaurant | Securities at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 0 |
Lodging and Restaurant | Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 60,372 | 115,827
Lodging and Restaurant | Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 444,003 | 531,832
Lodging and Restaurant | Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 504,375 | 647,659
Others |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 161,739,649 | 152,081,489
Others | Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 58,443,384 | 53,262,816
Others | Due from banks and loans at amortized cost | Banks |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 299,421 | 562,474
Others | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 276,729 | 186,211
Others | Due from banks and loans at amortized cost | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 56,537,352 | 51,324,876
Others | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,329,882 | 1,189,255
Others | Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 181,491 | 68,515
Others | Deposits and loans at FVTPL | Banks |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 29,783 |
Others | Deposits and loans at FVTPL | Corporations |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 151,708 | 68,515
Others | Securities at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 28,823,791 | 25,428,259
Others | Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 219,516 | 634,051
Others | Financial assets at FVOCI |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 50,370,126 | 49,952,877
Others | Securities at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 23,701,341 | 22,734,971
Others | Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,808,447 | 3,113,748
Others | Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 20,103,475 | 20,644,317
Others | Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 23,911,922 | 23,758,065
Retail customers |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 233,837,590 | 225,506,189
Retail customers | Due from banks and loans at amortized cost |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 233,837,073 | 225,504,220
Retail customers | Due from banks and loans at amortized cost | Retail |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 208,308,298 | 199,809,576
Retail customers | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 25,528,775 | 25,694,644
Retail customers | Deposits and loans at FVTPL |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 0 | 0
Retail customers | Derivative assets |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 517 | 1,969
Retail customers | Guarantees |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 878 | 12,979
Retail customers | Loan commitments and other liabilities related to credit |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 130,282,649 | 128,329,204
Retail customers | Total |  |
Concentration by industry sector of financial instrument, net of allowance [Line Items] |  |
Financial assets, net | ₩ 130,283,527 | ₩ 128,342,183

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