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Financial risk management - Concentration by geographic location for financial instrument, net of allowance (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Concentration by geographic location for 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 geographic location for 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 geographic location for 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 geographic location for 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 geographic location for 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 geographic location for 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 geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 27,695,043 27,714,596
Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,456,116 1,915,396
Deposits and loans at FVTPL | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 169,972 134,609
Deposits and loans at FVTPL | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,286,144 1,780,787
Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 71,727,860 67,134,121
Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 7,153,950 10,279,257
Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 101,282,906 92,016,210
Securities at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 31,944,368 33,315,999
Guarantees    
Concentration by geographic location for 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 geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 220,317,053 218,980,794
Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 246,539,021 241,489,989
Korea    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 623,940,412 613,818,760
Korea | Due from banks and loans at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 434,311,622 429,699,348
Korea | Due from banks and loans at amortized cost | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 4,934,110 6,303,730
Korea | Due from banks and loans at amortized cost | Retail    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 192,492,848 185,102,271
Korea | Due from banks and loans at amortized cost | Government/Public sector/ Central bank    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 15,993,867 21,716,534
Korea | Due from banks and loans at amortized cost | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 193,530,841 189,219,966
Korea | Due from banks and loans at amortized cost | Card receivable    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 27,359,956 27,356,847
Korea | Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,264,493 1,556,383
Korea | Deposits and loans at FVTPL | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 129,110 99,159
Korea | Deposits and loans at FVTPL | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,135,383 1,457,224
Korea | Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 65,274,393 61,955,771
Korea | Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 5,776,528 8,199,726
Korea | Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 87,212,394 81,294,290
Korea | Securities at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 30,100,982 31,113,242
Korea | Guarantees    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 23,442,408 20,517,889
Korea | Loan commitments and other liabilities related to credit    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 210,218,685 206,833,657
Korea | Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 233,661,093 227,351,546
USA    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 24,508,607 17,808,654
USA | Due from banks and loans at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 12,872,054 8,025,048
USA | Due from banks and loans at amortized cost | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,409,928 1,284,361
USA | Due from banks and loans at amortized cost | Retail    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 595,218 506,525
USA | Due from banks and loans at amortized cost | Government/Public sector/ Central bank    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 5,354,336 1,018,284
USA | Due from banks and loans at amortized cost | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 5,498,636 5,203,409
USA | Due from banks and loans at amortized cost | Card receivable    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 13,936 12,469
USA | Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 124,116 198,961
USA | Deposits and loans at FVTPL | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 40,862 35,450
USA | Deposits and loans at FVTPL | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 83,254 163,511
USA | Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 3,720,780 3,321,700
USA | Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 480,953 687,950
USA | Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 7,104,105 5,367,178
USA | Securities at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 206,599 207,817
USA | Guarantees    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 802,192 579,426
USA | Loan commitments and other liabilities related to credit    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,546,770 1,873,831
USA | Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 2,348,962 2,453,257
UK    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 3,455,758 2,281,763
UK | Due from banks and loans at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,788,203 1,421,880
UK | Due from banks and loans at amortized cost | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 479,051 624,468
UK | Due from banks and loans at amortized cost | Retail    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 8,021 7,064
UK | Due from banks and loans at amortized cost | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,300,654 789,820
UK | Due from banks and loans at amortized cost | Card receivable    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 477 528
UK | Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 0 0
UK | Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 861,745 377,462
UK | Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 17,518 41,218
UK | Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 788,292 441,203
UK | Guarantees    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 273,331 250,938
UK | Loan commitments and other liabilities related to credit    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 270,460 290,909
UK | Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 543,791 541,847
Japan    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 17,605,115 15,860,495
Japan | Due from banks and loans at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 16,086,649 14,492,721
Japan | Due from banks and loans at amortized cost | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 278,851 334,073
Japan | Due from banks and loans at amortized cost | Retail    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 5,464,414 5,165,687
Japan | Due from banks and loans at amortized cost | Government/Public sector/ Central bank    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 2,137,190 1,914,100
Japan | Due from banks and loans at amortized cost | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 8,202,921 7,075,869
Japan | Due from banks and loans at amortized cost | Card receivable    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 3,273 2,992
Japan | Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 14,424 15,402
Japan | Deposits and loans at FVTPL | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 14,424 15,402
Japan | Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 147,328 135,194
Japan | Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 153,496 152,555
Japan | Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 771,151 564,635
Japan | Securities at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 432,067 499,988
Japan | Guarantees    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 38,669 44,186
Japan | Loan commitments and other liabilities related to credit    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 572,774 352,256
Japan | Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 611,443 396,442
Germany    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 987,764 1,086,152
Germany | Due from banks and loans at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 751,357 773,776
Germany | Due from banks and loans at amortized cost | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 363,081 354,583
Germany | Due from banks and loans at amortized cost | Retail    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 3,807 3,399
Germany | Due from banks and loans at amortized cost | Government/Public sector/ Central bank    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 178,022 197,042
Germany | Due from banks and loans at amortized cost | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 206,108 218,422
Germany | Due from banks and loans at amortized cost | Card receivable    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 339 330
Germany | Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 0 0
Germany | Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 7,399 2,564
Germany | Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 112,892 274,786
Germany | Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 116,116 35,026
Germany | Guarantees    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 26,576 9,663
Germany | Loan commitments and other liabilities related to credit    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 126,187 87,212
Germany | Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 152,763 96,875
Vietnam    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 11,891,042 11,650,601
Vietnam | Due from banks and loans at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 11,359,951 10,830,453
Vietnam | Due from banks and loans at amortized cost | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 933,820 1,295,863
Vietnam | Due from banks and loans at amortized cost | Retail    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 5,054,569 4,391,692
Vietnam | Due from banks and loans at amortized cost | Government/Public sector/ Central bank    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 403,760 334,366
Vietnam | Due from banks and loans at amortized cost | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 4,729,918 4,533,648
Vietnam | Due from banks and loans at amortized cost | Card receivable    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 237,884 274,884
Vietnam | Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 4,133 5,193
Vietnam | Deposits and loans at FVTPL | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 4,133 5,193
Vietnam | Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 12,012  
Vietnam | Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 6,618 3,201
Vietnam | Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 42,978 50,368
Vietnam | Securities at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 465,350 761,386
Vietnam | Guarantees    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 202,498 199,535
Vietnam | Loan commitments and other liabilities related to credit    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 2,387,567 2,187,736
Vietnam | Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 2,590,065 2,387,271
China    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 7,621,490 7,999,221
China | Due from banks and loans at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 6,726,046 7,164,953
China | Due from banks and loans at amortized cost | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,078,467 1,633,954
China | Due from banks and loans at amortized cost | Retail    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,817,292 2,002,467
China | Due from banks and loans at amortized cost | Government/Public sector/ Central bank    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 303,764 360,451
China | Due from banks and loans at amortized cost | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 3,476,094 3,125,771
China | Due from banks and loans at amortized cost | Card receivable    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 50,429 42,310
China | Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 0 0
China | Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 11,839 7,144
China | Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 7,791 1,613
China | Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 779,447 708,567
China | Securities at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 96,367 116,944
China | Guarantees    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 734,356 511,891
China | Loan commitments and other liabilities related to credit    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,064,500 2,158,798
China | Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,798,856 2,670,689
Other    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 25,188,519 21,679,325
Other | Due from banks and loans at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 17,737,625 15,115,809
Other | Due from banks and loans at amortized cost | Banks    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 3,181,401 2,227,019
Other | Due from banks and loans at amortized cost | Retail    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 2,872,129 2,630,471
Other | Due from banks and loans at amortized cost | Government/Public sector/ Central bank    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 2,046,393 1,687,531
Other | Due from banks and loans at amortized cost | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 9,608,953 8,546,552
Other | Due from banks and loans at amortized cost | Card receivable    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 28,749 24,236
Other | Deposits and loans at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 48,950 139,457
Other | Deposits and loans at FVTPL | Corporations    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 48,950 139,457
Other | Securities at FVTPL    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 1,692,364 1,334,286
Other | Derivative assets    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 598,154 918,208
Other | Securities at FVOCI    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 4,468,423 3,554,943
Other | Securities at amortized cost    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 643,003 616,622
Other | Guarantees    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 701,938 395,667
Other | Loan commitments and other liabilities related to credit    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net 4,130,110 5,196,395
Other | Total    
Concentration by geographic location for financial instrument, net of allowance [Line Items]    
Financial assets, net ₩ 4,832,048 ₩ 5,592,062