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Operating segments - Information of income and expense for each operating segment (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | ₩ 11,694,456 | ₩ 11,402,302 | ₩ 10,817,922
Net fees and commission income (expense) |  | 2,921,211 | 2,714,874 | 2,647,206
Reversal of (provision for) credit loss allowance |  | (2,002,965) | (2,013,274) | (2,244,503)
General and administrative expenses |  | (6,402,500) | (6,116,240) | (5,895,337)
Other income (expense), net |  | 813,155 | 471,008 | 775,562
Operating income (expense) |  | 7,023,357 | 6,458,670 | 6,100,850
Equity method income (loss) |  | 221,225 | (23,822) | 125,088
Income tax expense |  | 1,844,490 | 1,470,922 | 1,486,960
Profit for the year |  | 5,084,519 | 4,558,170 | 4,478,000
Controlling interest |  | 4,971,561 | 4,450,177 | 4,368,035
Non-controlling interests |  | 112,958 | 107,993 | 109,965
External customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | 11,694,456 | 11,402,302 | 10,817,922
Net fees and commission income (expense) |  | 2,921,211 | 2,714,874 | 2,647,206
Internal-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  |  |  | 0
Net fees and commission income (expense) |  |  |  | 0
Inter-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | 0 | 0 |
Net fees and commission income (expense) |  | 0 | 0 |
Banks |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | 9,332,810 | 8,988,515 | 8,548,138
Net fees and commission income (expense) |  | 1,051,527 | 867,909 | 748,044
Reversal of (provision for) credit loss allowance |  | (666,420) | (425,429) | (914,848)
General and administrative expenses |  | (4,260,611) | (3,983,172) | (3,876,485)
Other income (expense), net |  | (279,671) | (507,922) | (495,331)
Operating income (expense) |  | 5,177,635 | 4,939,901 | 4,009,518
Equity method income (loss) |  | 14,295 | 9,856 | 8,556
Income tax expense |  | 1,250,175 | 1,040,924 | 936,472
Profit for the year |  | 3,685,246 | 3,610,084 | 2,969,829
Controlling interest |  | 3,684,190 | 3,609,620 | 2,969,519
Non-controlling interests |  | 1,056 | 464 | 310
Banks | External customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | 9,330,010 | 8,987,390 | 8,557,545
Net fees and commission income (expense) |  | 1,087,979 | 911,057 | 794,021
Banks | Internal-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  |  |  | (9,407)
Net fees and commission income (expense) |  |  |  | (45,977)
Banks | Inter-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | 2,800 | 1,125 |
Net fees and commission income (expense) |  | (36,452) | (43,148) |
Credit card |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | 1,947,497 | 1,931,171 | 1,895,298
Net fees and commission income (expense) |  | 763,885 | 934,519 | 968,665
Reversal of (provision for) credit loss allowance |  | (911,601) | (917,239) | (883,956)
General and administrative expenses |  | (889,822) | (855,125) | (778,564)
Other income (expense), net |  | (167,895) | (215,670) | (267,959)
Operating income (expense) |  | 742,064 | 877,656 | 933,484
Equity method income (loss) |  | 12,794 | (4,053) | (2,831)
Income tax expense |  | 176,969 | 224,731 | 218,332
Profit for the year |  | 584,711 | 671,506 | 725,171
Controlling interest |  | 581,251 | 668,392 | 723,845
Non-controlling interests |  | 3,460 | 3,114 | 1,326
Credit card | External customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | 1,997,682 | 1,997,334 | 1,961,035
Net fees and commission income (expense) |  | 817,107 | 984,884 | 1,019,262
Credit card | Internal-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  |  |  | (65,737)
Net fees and commission income (expense) |  |  |  | (50,597)
Credit card | Inter-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | (50,185) | (66,163) |
Net fees and commission income (expense) |  | (53,222) | (50,365) |
Securities |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | 572,266 | 573,375 | 443,676
Net fees and commission income (expense) |  | 690,164 | 535,910 | 500,441
Reversal of (provision for) credit loss allowance |  | (116,592) | (136,466) | (152,146)
General and administrative expenses |  | (804,320) | (786,141) | (720,835)
Other income (expense), net |  | 146,960 | 95,227 | 181,927
Operating income (expense) |  | 488,478 | 281,905 | 253,063
Equity method income (loss) |  | 32,636 | (558) | 93
Income tax expense |  | 104,732 | 54,238 | 36,239
Profit for the year |  | 381,605 | 179,160 | 100,840
Controlling interest |  | 381,617 | 179,157 | 100,915
Non-controlling interests |  | (12) | 3 | (75)
Securities | External customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | 595,111 | 596,982 | 449,835
Net fees and commission income (expense) |  | 697,178 | 541,673 | 507,109
Securities | Internal-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  |  |  | (6,159)
Net fees and commission income (expense) |  |  |  | (6,668)
Securities | Inter-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | (22,845) | (23,607) |
Net fees and commission income (expense) |  | (7,014) | (5,763) |
Insurance |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | (146,977) | (135,352) | (198,785)
Net fees and commission income (expense) |  | (8,814) | (4,380) | (3,210)
Reversal of (provision for) credit loss allowance |  | (4,840) | (6,237) | (16,116)
General and administrative expenses |  | (191,106) | (201,994) | (218,820)
Other income (expense), net |  | 1,110,751 | 1,055,611 | 1,087,789
Operating income (expense) |  | 759,014 | 707,648 | 650,858
Equity method income (loss) |  | (2,428) | (894) | (302)
Income tax expense |  | 280,406 | 193,041 | 167,417
Profit for the year |  | 475,399 | 510,998 | 464,617
Controlling interest |  | 475,399 | 510,998 | 464,617
Non-controlling interests |  | 0 | 0 | 0
Insurance | External customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | (142,326) | (129,874) | (208,812)
Net fees and commission income (expense) |  | 1,310 | 3,561 | 2,151
Insurance | Internal-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  |  |  | 10,027
Net fees and commission income (expense) |  |  |  | (5,361)
Insurance | Inter-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | (4,651) | (5,478) |
Net fees and commission income (expense) |  | (10,124) | (7,941) |
Credit |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | 102,274 | 143,672 | 248,804
Net fees and commission income (expense) |  | 22,959 | 17,442 | 17,463
Reversal of (provision for) credit loss allowance |  | (239,571) | (151,258) | (177,912)
General and administrative expenses |  | (65,588) | (65,273) | (80,106)
Other income (expense), net |  | 221,419 | 177,677 | 335,205
Operating income (expense) |  | 41,493 | 122,260 | 343,454
Equity method income (loss) |  | 96,362 | 25,148 | 66,918
Income tax expense |  | 28,266 | 27,044 | 89,849
Profit for the year |  | 108,273 | 116,948 | 304,024
Controlling interest |  | 108,273 | 116,948 | 304,024
Non-controlling interests |  | 0 | 0 | 0
Credit | External customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | 119,698 | 170,737 | 265,943
Net fees and commission income (expense) |  | 22,216 | 15,910 | 14,917
Credit | Internal-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  |  |  | (17,139)
Net fees and commission income (expense) |  |  |  | 2,546
Credit | Inter-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | (17,424) | (27,065) |
Net fees and commission income (expense) |  | 743 | 1,532 |
Others |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | 77,314 | 92,600 | 125,238
Net fees and commission income (expense) |  | 377,488 | 336,957 | 391,122
Reversal of (provision for) credit loss allowance |  | (62,605) | (375,991) | (99,203)
General and administrative expenses |  | (443,479) | (437,691) | (403,395)
Other income (expense), net |  | 325,066 | 548,614 | 327,511
Operating income (expense) |  | 273,784 | 164,489 | 341,273
Equity method income (loss) |  | 8,249 | (5,453) | 664
Income tax expense |  | 7,813 | 52,899 | 81,695
Profit for the year |  | 275,426 | (124,845) | 243,928
Controlling interest |  | 275,426 | (124,845) | 243,928
Non-controlling interests |  | 0 | 0 | 0
Others | External customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | (1,078) | 1,207 | 36,700
Net fees and commission income (expense) |  | 295,421 | 257,789 | 309,746
Others | Internal-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  |  |  | 88,538
Net fees and commission income (expense) |  |  |  | 81,376
Others | Inter-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) |  | 78,392 | 91,393 |
Net fees and commission income (expense) |  | 82,067 | 79,168 |
Consolidation adjustment |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | (190,728) | (191,679) | (244,447)
Net fees and commission income (expense) |  | 24,002 | 26,517 | 24,681
Reversal of (provision for) credit loss allowance |  | (1,336) | (654) | (322)
General and administrative expenses |  | 252,426 | 213,156 | 182,868
Other income (expense), net |  | (543,475) | (682,529) | (393,580)
Operating income (expense) |  | (459,111) | (635,189) | (430,800)
Equity method income (loss) |  | 59,317 | (47,868) | 51,990
Income tax expense |  | (3,871) | (121,955) | (43,044)
Profit for the year |  | (426,141) | (405,681) | (330,409)
Controlling interest |  | (534,595) | (510,093) | (438,813)
Non-controlling interests |  | 108,454 | 104,412 | 108,404
Consolidation adjustment | External customers |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | (204,641) | (221,474) | (244,324)
Net fees and commission income (expense) |  | 0 | 0 | 0
Consolidation adjustment | Internal-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] |  |  | (123)
Net fees and commission income (expense) |  |  |  | ₩ 24,681
Consolidation adjustment | Inter-segment transactions |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net interest income (expense) | [1] | 13,913 | 29,795 |
Net fees and commission income (expense) |  | ₩ 24,002 | ₩ 26,517 |
[1] | Consolidated adjustments to net interest income from external customers relate to the fair value measurement of securities and other assets arising from business combination accounting.

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