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Loans at amortized cost, etc. - Changes in allowances for credit loss of loans at amortized cost and other assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Loans at amortized cost net category    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance ₩ 4,565,931 ₩ 4,330,470
Transfer (from) to 12 months expected credit losses 0 0
Transfer (from) to lifetime expected credit losses 0 0
Transfer (from) to credit- impaired financial assets 0 0
Provision 2,014,137 1,862,013
Write-offs (2,027,917) [1] (1,536,101) [2]
Amortization of discount (39,119) (35,031)
Disposal (549,376) (424,838)
Collection 343,795 361,038
Others [3] (26,779) 8,380
Ending balance 4,280,672 4,565,931
Loans at amortized cost net category | Retail | 12-month expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 268,533 243,266
Transfer (from) to 12 months expected credit losses 53,827 40,874
Transfer (from) to lifetime expected credit losses (18,210) (24,178)
Transfer (from) to credit- impaired financial assets (17,720) (15,753)
Provision (22,099) 21,772
Write-offs 0 [1] 0 [2]
Amortization of discount 0 0
Disposal 0 0
Collection 0 0
Others [3] (2,369) 2,552
Ending balance 261,962 268,533
Loans at amortized cost net category | Retail | Lifetime expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 223,017 207,362
Transfer (from) to 12 months expected credit losses (51,918) (39,258)
Transfer (from) to lifetime expected credit losses 56,419 50,652
Transfer (from) to credit- impaired financial assets (26,077) (21,007)
Provision 21,425 25,003
Write-offs 0 [1] 0 [2]
Amortization of discount 0 0
Disposal (377) (261)
Collection 0 0
Others [3] (478) 526
Ending balance 222,011 223,017
Loans at amortized cost net category | Retail | Financial instruments credit-impaired    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 340,091 283,191
Transfer (from) to 12 months expected credit losses (1,909) (1,616)
Transfer (from) to lifetime expected credit losses (38,209) (26,474)
Transfer (from) to credit- impaired financial assets 43,797 36,760
Provision 251,154 392,200
Write-offs (373,347) [1] (393,809) [2]
Amortization of discount (11,333) (13,501)
Disposal (66,868) (53,538)
Collection 195,229 112,627
Others [3] 921 4,251
Ending balance 339,526 340,091
Loans at amortized cost net category | Corporations | 12-month expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 725,105 789,050
Transfer (from) to 12 months expected credit losses 134,081 140,511
Transfer (from) to lifetime expected credit losses (74,530) (79,310)
Transfer (from) to credit- impaired financial assets (5,712) (5,838)
Provision (71,512) (123,593)
Write-offs 0 [1] 0 [2]
Amortization of discount 0 0
Disposal 0 (2,946)
Collection 0 0
Others [3] (7,497) 7,231
Ending balance 699,935 725,105
Loans at amortized cost net category | Corporations | Lifetime expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 872,904 994,345
Transfer (from) to 12 months expected credit losses (132,826) (137,260)
Transfer (from) to lifetime expected credit losses 80,482 86,108
Transfer (from) to credit- impaired financial assets (76,398) (84,444)
Provision 83,178 23,937
Write-offs 0 [1] 0 [2]
Amortization of discount 0 0
Disposal (3,381) (19,347)
Collection 0 0
Others [3] (6,213) 9,565
Ending balance 817,746 872,904
Loans at amortized cost net category | Corporations | Financial instruments credit-impaired    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 958,808 628,487
Transfer (from) to 12 months expected credit losses (1,255) (3,251)
Transfer (from) to lifetime expected credit losses (5,952) (6,798)
Transfer (from) to credit- impaired financial assets 82,110 90,282
Provision 885,920 760,786
Write-offs (833,199) [1] (450,932) [2]
Amortization of discount (27,865) (27,710)
Disposal (107,589) (90,141)
Collection 51,741 75,082
Others [3] (4,283) (16,997)
Ending balance 998,436 958,808
Loans at amortized cost net category | Credit card | 12-month expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 263,914 230,286
Transfer (from) to 12 months expected credit losses 84,381 25,333
Transfer (from) to lifetime expected credit losses (24,117) (19,981)
Transfer (from) to credit- impaired financial assets (11,675) (2,696)
Provision (87,645) 30,805
Write-offs 0 [1] 0 [2]
Amortization of discount 0 0
Disposal 0 0
Collection 0 0
Others [3] 316 167
Ending balance 225,174 263,914
Loans at amortized cost net category | Credit card | Lifetime expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 418,255 460,848
Transfer (from) to 12 months expected credit losses (84,246) (25,273)
Transfer (from) to lifetime expected credit losses 24,486 20,177
Transfer (from) to credit- impaired financial assets (113,200) (4,919)
Provision 132,894 (32,602)
Write-offs 0 [1] 0 [2]
Amortization of discount 0 0
Disposal 0 0
Collection 0 0
Others [3] (1,003) 24
Ending balance 377,186 418,255
Loans at amortized cost net category | Credit card | Financial instruments credit-impaired    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 458,116 462,554
Transfer (from) to 12 months expected credit losses (135) (60)
Transfer (from) to lifetime expected credit losses (369) (196)
Transfer (from) to credit- impaired financial assets 124,875 7,615
Provision 825,064 751,753
Write-offs (806,961) [1] (685,877) [2]
Amortization of discount 79 6,180
Disposal (371,086) (257,543)
Collection 96,413 172,842
Others [3] (6,187) 848
Ending balance 319,809 458,116
Loans at amortized cost net category | Others | 12-month expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 12,748 13,372
Transfer (from) to 12 months expected credit losses 8,442 85
Transfer (from) to lifetime expected credit losses (283) (1,310)
Transfer (from) to credit- impaired financial assets (45) 0
Provision (10,665) 412
Write-offs 0 [1] 0 [2]
Amortization of discount 0 0
Disposal 0 0
Collection 0 0
Others [3] 86 189
Ending balance 10,283 12,748
Loans at amortized cost net category | Others | Lifetime expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 17,575 10,371
Transfer (from) to 12 months expected credit losses (8,442) (85)
Transfer (from) to lifetime expected credit losses 283 1,310
Transfer (from) to credit- impaired financial assets (244) (60)
Provision (2,233) 6,016
Write-offs 0 [1] 0 [2]
Amortization of discount 0 0
Disposal 0 (1)
Collection 0 0
Others [3] (72) 24
Ending balance 6,867 17,575
Loans at amortized cost net category | Others | Financial instruments credit-impaired    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 6,865 7,338
Transfer (from) to 12 months expected credit losses 0 0
Transfer (from) to lifetime expected credit losses 0 0
Transfer (from) to credit- impaired financial assets 289 60
Provision 8,656 5,524
Write-offs (14,410) [1] (5,483) [2]
Amortization of discount 0 0
Disposal (75) (1,061)
Collection 412 487
Others [3] 0 0
Ending balance 1,737 6,865
Due from banks at amortized cost and other financial assets    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 595,646 486,569
Transfer (from) to 12 months expected credit losses 0 0
Transfer (from) to lifetime expected credit losses 0 0
Transfer (from) to credit- impaired financial assets 0 0
Provision 70,035 113,662
Write-offs (92,749) (61,157)
Disposal (5,700) (15,067)
Collection 2,688 3,292
Others [3] (12,504) 68,347
Ending balance 557,416 595,646
Due from banks at amortized cost and other financial assets | 12-month expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 394,484 332,951
Transfer (from) to 12 months expected credit losses 654 1,262
Transfer (from) to lifetime expected credit losses (869) (5,414)
Transfer (from) to credit- impaired financial assets (1,957) (178)
Provision 4,759 175
Write-offs 0 0
Disposal 0 (1)
Collection 0 0
Others [3] 1,728 65,689
Ending balance 398,799 394,484
Due from banks at amortized cost and other financial assets | Lifetime expected credit losses    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 14,752 15,650
Transfer (from) to 12 months expected credit losses (613) (1,229)
Transfer (from) to lifetime expected credit losses 891 5,441
Transfer (from) to credit- impaired financial assets (5,084) (5,715)
Provision 507 629
Write-offs 0 0
Disposal (37) (38)
Collection 0 0
Others [3] (6) 14
Ending balance 10,410 14,752
Due from banks at amortized cost and other financial assets | Financial instruments credit-impaired    
Changes in the allowance for credit losses of Loans at amortized cost and other financial assets [Line Items]    
Beginning balance 186,410 137,968
Transfer (from) to 12 months expected credit losses (41) (33)
Transfer (from) to lifetime expected credit losses (22) (27)
Transfer (from) to credit- impaired financial assets 7,041 5,893
Provision 64,769 112,858
Write-offs (92,749) (61,157)
Disposal (5,663) (15,028)
Collection 2,688 3,292
Others [3] (14,226) 2,644
Ending balance ₩ 148,207 ₩ 186,410
[1] The amount of uncollected loans currently in recovery (principal and interest) is W 10,682,802 million, which is written off as of December 31, 2025.
[2] The amount of uncollected loans currently in recovery (principal and interest) is W 10,268,898 million, which is written off as of December 31, 2024.
[3] Includes the effects of restructuring of loans, debt-to-equity swaps, and changes in foreign exchange rates, among others.