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Loans at amortized cost, etc. - Changes in loans at amortized cost, etc. (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 loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | ₩ 453,861,169 |  | ₩ 416,070,032 |
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 |
Net increase and decrease | [1] | 18,913,071 |  | 40,891,639 |
Charge off |  | (2,027,917) | [2] | (1,536,101) | [3]
Disposal |  | (1,691,771) |  | (1,564,401) |
Ending balance |  | 469,054,552 |  | 453,861,169 |
Loans at amortized cost net category | Retail | 12-month expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 153,512,220 |  | 145,441,757 |
Transfer (from) to 12 months expected credit losses |  | 4,966,815 |  | 3,147,209 |
Transfer (from) to lifetime expected credit losses |  | (4,600,026) |  | (7,176,298) |
Transfer (from) to credit- impaired financial assets |  | (450,753) |  | (478,797) |
Net increase and decrease | [1] | 10,479,493 |  | 12,578,349 |
Charge off |  | 0 | [2] | 0 | [3]
Disposal |  | 0 |  | 0 |
Ending balance |  | 163,907,749 |  | 153,512,220 |
Loans at amortized cost net category | Retail | Lifetime expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 12,364,744 |  | 9,390,209 |
Transfer (from) to 12 months expected credit losses |  | (4,952,706) |  | (3,133,165) |
Transfer (from) to lifetime expected credit losses |  | 4,678,174 |  | 7,236,219 |
Transfer (from) to credit- impaired financial assets |  | (296,548) |  | (281,842) |
Net increase and decrease | [1] | (2,351,966) |  | (843,971) |
Charge off |  | 0 | [2] | 0 | [3]
Disposal |  | (2,672) |  | (2,706) |
Ending balance |  | 9,439,026 |  | 12,364,744 |
Loans at amortized cost net category | Retail | Financial instruments credit-impaired |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 904,376 |  | 794,050 |
Transfer (from) to 12 months expected credit losses |  | (14,109) |  | (14,044) |
Transfer (from) to lifetime expected credit losses |  | (78,148) |  | (59,921) |
Transfer (from) to credit- impaired financial assets |  | 747,301 |  | 760,639 |
Net increase and decrease | [1] | 1,694 |  | 18,273 |
Charge off |  | (373,347) | [2] | (393,809) | [3]
Disposal |  | (241,633) |  | (200,812) |
Ending balance |  | 946,134 |  | 904,376 |
Loans at amortized cost net category | Corporations | 12-month expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 199,978,305 |  | 181,802,456 |
Transfer (from) to 12 months expected credit losses |  | 11,474,546 |  | 8,633,328 |
Transfer (from) to lifetime expected credit losses |  | (15,753,286) |  | (14,466,401) |
Transfer (from) to credit- impaired financial assets |  | (843,905) |  | (424,077) |
Net increase and decrease | [1] | 10,956,888 |  | 24,466,147 |
Charge off |  | 0 | [2] | 0 | [3]
Disposal |  | (9,998) |  | (33,148) |
Ending balance |  | 205,802,550 |  | 199,978,305 |
Loans at amortized cost net category | Corporations | Lifetime expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 49,062,758 |  | 41,746,140 |
Transfer (from) to 12 months expected credit losses |  | (11,453,191) |  | (8,567,306) |
Transfer (from) to lifetime expected credit losses |  | 16,008,648 |  | 14,506,969 |
Transfer (from) to credit- impaired financial assets |  | (670,277) |  | (611,269) |
Net increase and decrease | [1] | (1,204,297) |  | 2,178,224 |
Charge off |  | 0 | [2] | 0 | [3]
Disposal |  | (57,522) |  | (190,000) |
Ending balance |  | 51,686,119 |  | 49,062,758 |
Loans at amortized cost net category | Corporations | Financial instruments credit-impaired |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 2,158,953 |  | 1,548,844 |
Transfer (from) to 12 months expected credit losses |  | (21,355) |  | (66,022) |
Transfer (from) to lifetime expected credit losses |  | (255,362) |  | (40,568) |
Transfer (from) to credit- impaired financial assets |  | 1,514,182 |  | 1,035,346 |
Net increase and decrease | [1] | 663,429 |  | 893,286 |
Charge off |  | (833,199) | [2] | (450,932) | [3]
Disposal |  | (839,847) |  | (761,001) |
Ending balance |  | 2,386,801 |  | 2,158,953 |
Loans at amortized cost net category | Credit card | 12-month expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 24,605,360 |  | 23,294,631 |
Transfer (from) to 12 months expected credit losses |  | 1,040,384 |  | 59,878 |
Transfer (from) to lifetime expected credit losses |  | (1,145,956) |  | (50,080) |
Transfer (from) to credit- impaired financial assets |  | (369,466) |  | (19,995) |
Net increase and decrease | [1] | 968,671 |  | 1,320,926 |
Charge off |  | 0 | [2] | 0 | [3]
Disposal |  | 0 |  | 0 |
Ending balance |  | 25,098,993 |  | 24,605,360 |
Loans at amortized cost net category | Credit card | Lifetime expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 3,606,533 |  | 4,110,407 |
Transfer (from) to 12 months expected credit losses |  | (1,040,209) |  | (59,830) |
Transfer (from) to lifetime expected credit losses |  | 1,146,484 |  | 50,133 |
Transfer (from) to credit- impaired financial assets |  | (357,902) |  | (12,913) |
Net increase and decrease | [1] | (318,368) |  | (481,264) |
Charge off |  | 0 | [2] | 0 | [3]
Disposal |  | 0 |  | 0 |
Ending balance |  | 3,036,538 |  | 3,606,533 |
Loans at amortized cost net category | Credit card | Financial instruments credit-impaired |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 642,990 |  | 645,603 |
Transfer (from) to 12 months expected credit losses |  | (175) |  | (48) |
Transfer (from) to lifetime expected credit losses |  | (528) |  | (53) |
Transfer (from) to credit- impaired financial assets |  | 727,368 |  | 32,908 |
Net increase and decrease | [1] | 450,990 |  | 1,008,038 |
Charge off |  | (806,961) | [2] | (685,877) | [3]
Disposal |  | (532,002) |  | (357,581) |
Ending balance |  | 481,682 |  | 642,990 |
Loans at amortized cost net category | Others | 12-month expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 5,982,867 |  | 6,444,509 |
Transfer (from) to 12 months expected credit losses |  | 127,708 |  | 30,878 |
Transfer (from) to lifetime expected credit losses |  | (214,090) |  | (189,201) |
Transfer (from) to credit- impaired financial assets |  | (10,524) |  | (43) |
Net increase and decrease | [1] | (675,876) |  | (303,276) |
Charge off |  | 0 | [2] | 0 | [3]
Disposal |  | 0 |  | 0 |
Ending balance |  | 5,210,085 |  | 5,982,867 |
Loans at amortized cost net category | Others | Lifetime expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 1,026,076 |  | 826,979 |
Transfer (from) to 12 months expected credit losses |  | (127,708) |  | (30,878) |
Transfer (from) to lifetime expected credit losses |  | 214,091 |  | 189,201 |
Transfer (from) to credit- impaired financial assets |  | (920) |  | (9,600) |
Net increase and decrease | [1] | (63,762) |  | 50,784 |
Charge off |  | 0 | [2] | 0 | [3]
Disposal |  | 0 |  | (410) |
Ending balance |  | 1,047,777 |  | 1,026,076 |
Loans at amortized cost net category | Others | Financial instruments credit-impaired |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 15,987 |  | 24,447 |
Transfer (from) to 12 months expected credit losses |  | 0 |  | 0 |
Transfer (from) to lifetime expected credit losses |  | (1) |  | 0 |
Transfer (from) to credit- impaired financial assets |  | 11,444 |  | 9,643 |
Net increase and decrease | [1] | 6,175 |  | 6,123 |
Charge off |  | (14,410) | [2] | (5,483) | [3]
Disposal |  | (8,097) |  | (18,743) |
Ending balance |  | 11,098 |  | 15,987 |
Due from banks at amortized cost and other financial assets |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 61,941,355 |  | 59,822,825 |
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 |
Net increase and decrease |  | 18,864,214 |  | 2,311,348 |
Charge off |  | (92,749) |  | (61,157) |
Disposal |  | (7,542) |  | (131,661) |
Ending balance |  | 80,705,278 |  | 61,941,355 |
Due from banks at amortized cost and other financial assets | 12-month expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 61,488,945 |  | 59,409,121 |
Transfer (from) to 12 months expected credit losses |  | 33,235 |  | 34,752 |
Transfer (from) to lifetime expected credit losses |  | (50,051) |  | (62,021) |
Transfer (from) to credit- impaired financial assets |  | (6,288) |  | (8,949) |
Net increase and decrease |  | 18,837,706 |  | 2,116,517 |
Charge off |  | 0 |  | 0 |
Disposal |  | 0 |  | (475) |
Ending balance |  | 80,303,547 |  | 61,488,945 |
Due from banks at amortized cost and other financial assets | Lifetime expected credit losses |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 235,252 |  | 245,916 |
Transfer (from) to 12 months expected credit losses |  | (33,122) |  | (34,626) |
Transfer (from) to lifetime expected credit losses |  | 50,130 |  | 62,091 |
Transfer (from) to credit- impaired financial assets |  | (16,627) |  | (21,143) |
Net increase and decrease |  | (14,525) |  | (10,556) |
Charge off |  | 0 |  | 0 |
Disposal |  | (1,164) |  | (6,430) |
Ending balance |  | 219,944 |  | 235,252 |
Due from banks at amortized cost and other financial assets | Financial instruments credit-impaired |  |  |  |  |
Changes in loans at amortized cost and other assets [Line Items] |  |  |  |  |
Beginning balance |  | 217,158 |  | 167,788 |
Transfer (from) to 12 months expected credit losses |  | (113) |  | (126) |
Transfer (from) to lifetime expected credit losses |  | (79) |  | (70) |
Transfer (from) to credit- impaired financial assets |  | 22,915 |  | 30,092 |
Net increase and decrease |  | 41,033 |  | 205,387 |
Charge off |  | (92,749) |  | (61,157) |
Disposal |  | (6,378) |  | (124,756) |
Ending balance |  | ₩ 181,787 |  | ₩ 217,158 |
[1] | Includes the effects of the issuance, collection, restructuring of loans, debt-to-equity swaps, and changes in foreign exchange rates, among others.
[2] | 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.
[3] | 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.

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