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Financial risk management - Credit loss allowances of financial assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | ₩ 639,166,244 | ₩ 617,453,658
Credit loss allowances of financial assets | (4,305,463) | (4,597,461)
Financial assets at amortized cost, net | 634,860,781 | 612,856,197
Mitigation of credit risk due to collateral | 289,207,455 | 269,235,141
Due from banks and loans at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 505,930,279 | 492,111,261
Credit loss allowances of financial assets | (4,296,772) | (4,587,273)
Financial assets at amortized cost, net | 501,633,507 | 487,523,988
Mitigation of credit risk due to collateral | 289,207,455 | 269,235,141
Due from banks and loans at amortized cost | Banks |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 12,669,064 | 14,083,041
Credit loss allowances of financial assets | (10,355) | (24,990)
Financial assets at amortized cost, net | 12,658,709 | 14,058,051
Mitigation of credit risk due to collateral | 171 | 27,874
Due from banks and loans at amortized cost | Retail |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 209,361,430 | 200,864,201
Credit loss allowances of financial assets | (1,053,132) | (1,054,625)
Financial assets at amortized cost, net | 208,308,298 | 199,809,576
Mitigation of credit risk due to collateral | 162,423,106 | 151,610,129
Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 26,428,898 | 27,232,184
Credit loss allowances of financial assets | (11,566) | (3,876)
Financial assets at amortized cost, net | 26,417,332 | 27,228,308
Mitigation of credit risk due to collateral | 2,597 | 2,500
Due from banks and loans at amortized cost | Corporations |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 228,853,674 | 221,076,952
Credit loss allowances of financial assets | (2,299,549) | (2,363,495)
Financial assets at amortized cost, net | 226,554,125 | 218,713,457
Mitigation of credit risk due to collateral | 126,763,442 | 117,575,757
Due from banks and loans at amortized cost | Card receivable |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 28,617,213 | 28,854,883
Credit loss allowances of financial assets | (922,170) | (1,140,287)
Financial assets at amortized cost, net | 27,695,043 | 27,714,596
Mitigation of credit risk due to collateral | 18,139 | 18,881
Securities at FVOCI |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 101,282,906 | 92,016,210
Financial assets at amortized cost, net | 101,282,906 | 92,016,210
Securities at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 31,953,059 | 33,326,187
Credit loss allowances of financial assets | (8,691) | (10,188)
Financial assets at amortized cost, net | 31,944,368 | 33,315,999
12-month expected credit losses | Grade 1 |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 485,833,383 | 467,871,541
12-month expected credit losses | Grade 1 | Due from banks and loans at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 365,393,368 | 353,549,452
12-month expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Banks |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 11,039,981 | 11,740,875
12-month expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Retail |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 188,215,501 | 177,166,099
12-month expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 23,669,547 | 25,118,226
12-month expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Corporations |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 121,819,093 | 117,893,181
12-month expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Card receivable |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 20,649,246 | 21,631,071
12-month expected credit losses | Grade 1 | Securities at FVOCI |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 90,408,440 | 83,218,889
12-month expected credit losses | Grade 1 | Securities at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 30,031,575 | 31,103,200
12-month expected credit losses | Grade 2 |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 84,268,787 | 79,730,199
12-month expected credit losses | Grade 2 | Due from banks and loans at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 71,499,668 | 68,774,293
12-month expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Banks |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 1,445,815 | 2,027,427
12-month expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Retail |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 6,674,522 | 6,397,386
12-month expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 2,468,610 | 2,030,126
12-month expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Corporations |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 56,460,975 | 55,345,067
12-month expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Card receivable |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 4,449,746 | 2,974,287
12-month expected credit losses | Grade 2 | Securities at FVOCI |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 10,847,635 | 8,736,563
12-month expected credit losses | Grade 2 | Securities at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 1,921,484 | 2,219,343
Lifetime expected credit losses | Grade 1 |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 33,454,025 | 33,556,728
Lifetime expected credit losses | Grade 1 | Due from banks and loans at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 33,454,025 | 33,546,694
Lifetime expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Banks |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 183,147 | 254,625
Lifetime expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Retail |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 9,227,654 | 11,714,193
Lifetime expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 290,730 | 83,783
Lifetime expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Corporations |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 22,692,064 | 20,324,015
Lifetime expected credit losses | Grade 1 | Due from banks and loans at amortized cost | Card receivable |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 1,060,430 | 1,170,078
Lifetime expected credit losses | Grade 1 | Securities at FVOCI |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost |  | 10,034
Lifetime expected credit losses | Grade 2 |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 31,784,264 | 32,572,737
Lifetime expected credit losses | Grade 2 | Due from banks and loans at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 31,757,433 | 32,518,369
Lifetime expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Banks |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 121 | 60,114
Lifetime expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Retail |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 3,991,054 | 4,387,929
Lifetime expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 11 | 49
Lifetime expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Corporations |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 25,790,138 | 25,633,821
Lifetime expected credit losses | Grade 2 | Due from banks and loans at amortized cost | Card receivable |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 1,976,109 | 2,436,456
Lifetime expected credit losses | Grade 2 | Securities at FVOCI |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 26,831 | 50,724
Lifetime expected credit losses | Grade 2 | Securities at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost |  | 3,644
Impaired |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 3,825,785 | 3,722,453
Impaired | Due from banks and loans at amortized cost |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 3,825,785 | 3,722,453
Impaired | Due from banks and loans at amortized cost | Retail |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 1,252,699 | 1,198,594
Impaired | Due from banks and loans at amortized cost | Corporations |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | 2,091,404 | 1,880,868
Impaired | Due from banks and loans at amortized cost | Card receivable |  |
Impairment information by credit risk of financial assets [Line Items] |  |
Financial assets at amortized cost | ₩ 481,682 | ₩ 642,991

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