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Operating segments - Information of income and expense for each operating segment (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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.