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Financial risk management - Credit loss allowances of financial assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
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