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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
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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.

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