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Loans at amortized cost, etc. - Changes in loans at amortized cost, etc. (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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.