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Insurance Risk - Summary of insurance contracts and reinsurance contracts (Details) - Liquidity risk [member] - Insurance contracts to which premium allocation approach has been applied [member] - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Total (including variable insurance) ₩ (100,478,344) ₩ (96,071,402)
Total (excluding variable insurance) (91,536,490) (88,371,883)
Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Total (including variable insurance) 519,937 (818,348)
Total (excluding variable insurance) 1,031,064 (384,692)
1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Total (including variable insurance) 36,289 (57,253)
Total (excluding variable insurance) 529,498 323,801
2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Total (including variable insurance) (507,898) (595,781)
Total (excluding variable insurance) (39,965) (220,860)
3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Total (including variable insurance) (1,042,247) (809,125)
Total (excluding variable insurance) (622,809) (451,468)
4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Total (including variable insurance) (1,338,668) (1,546,406)
Total (excluding variable insurance) (947,236) (1,224,258)
5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Total (including variable insurance) (98,145,757) (92,244,489)
Total (excluding variable insurance) (91,487,042) (86,414,406)
Insurance contracts issued [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (100,624,155) (95,070,889)
Insurance contracts issued [member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 545,020 (798,583)
Insurance contracts issued [member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 69,234 (36,041)
Insurance contracts issued [member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (473,036) (574,893)
Insurance contracts issued [member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (1,008,268) (789,584)
Insurance contracts issued [member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (1,305,043) (1,527,047)
Insurance contracts issued [member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (98,452,062) (91,344,741)
Insurance contracts issued [member] | Variable Insurance [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (8,941,854) (7,699,519)
Insurance contracts issued [member] | Variable Insurance [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (511,127) (433,656)
Insurance contracts issued [member] | Variable Insurance [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (493,209) (381,054)
Insurance contracts issued [member] | Variable Insurance [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (467,933) (374,921)
Insurance contracts issued [member] | Variable Insurance [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (419,438) (357,657)
Insurance contracts issued [member] | Variable Insurance [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (391,432) (322,148)
Insurance contracts issued [member] | Variable Insurance [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (6,658,715) (5,830,083)
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Inflow [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 3,718,577 4,086,896
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Inflow [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 437,302 482,531
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Inflow [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 361,966 402,250
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Inflow [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 297,826 334,537
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Inflow [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 249,995 279,308
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Inflow [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 213,177 237,124
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Inflow [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 2,158,311 2,351,146
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Outflow [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (12,660,431) (11,786,415)
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Outflow [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (948,429) (916,187)
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Outflow [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (855,175) (783,304)
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Outflow [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (765,759) (709,458)
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Outflow [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (669,433) (636,965)
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Outflow [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (604,609) (559,272)
Insurance contracts issued [member] | Variable Insurance [Member] | Cash Outflow [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (8,817,026) (8,181,229)
Insurance contracts issued [member] | Participaing Insurance [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (9,138,250) (9,583,623)
Insurance contracts issued [member] | Participaing Insurance [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (206,450) (196,832)
Insurance contracts issued [member] | Participaing Insurance [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (228,275) (194,789)
Insurance contracts issued [member] | Participaing Insurance [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (235,549) (207,299)
Insurance contracts issued [member] | Participaing Insurance [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (241,928) (221,198)
Insurance contracts issued [member] | Participaing Insurance [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (247,597) (224,346)
Insurance contracts issued [member] | Participaing Insurance [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (7,978,451) (8,539,159)
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Inflow [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 173,909 244,338
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Inflow [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 34,397 43,374
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Inflow [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 25,425 33,437
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Inflow [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 20,141 24,916
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Inflow [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 16,443 19,959
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Inflow [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 13,515 16,437
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Inflow [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 63,988 106,215
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Outflow [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (9,312,159) (9,827,961)
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Outflow [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (240,847) (240,206)
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Outflow [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (253,700) (228,226)
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Outflow [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (255,690) (232,215)
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Outflow [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (258,371) (241,157)
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Outflow [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (261,112) (240,783)
Insurance contracts issued [member] | Participaing Insurance [Member] | Cash Outflow [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (8,042,439) (8,645,374)
Insurance contracts issued [member] | Nonparticipating Insurance [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (82,544,051) (77,787,747)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 1,262,597 (168,095)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 790,718 539,802
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 230,446 7,327
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (346,902) (210,729)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (666,014) (980,553)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (83,814,896) (76,975,499)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Inflow [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 76,222,419 69,416,210
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Inflow [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 6,331,260 5,582,811
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Inflow [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 5,662,522 4,840,753
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Inflow [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 5,010,684 4,361,203
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Inflow [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 4,358,197 3,863,416
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Inflow [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 3,771,019 3,314,013
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Inflow [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 51,088,737 47,454,014
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Outflow [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (158,766,470) (147,203,957)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Outflow [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (5,068,663) (5,750,906)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Outflow [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (4,871,804) (4,300,951)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Outflow [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (4,780,238) (4,353,876)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Outflow [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (4,705,099) (4,074,145)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Outflow [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (4,437,033) (4,294,566)
Insurance contracts issued [member] | Nonparticipating Insurance [Member] | Cash Outflow [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (134,903,633) (124,429,513)
Reinsurance contracts held [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 145,811 (1,000,513)
Reinsurance contracts held [member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (25,083) (19,765)
Reinsurance contracts held [member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (32,945) (21,212)
Reinsurance contracts held [member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (34,862) (20,888)
Reinsurance contracts held [member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (33,979) (19,541)
Reinsurance contracts held [member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (33,625) (19,359)
Reinsurance contracts held [member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 306,305 (899,748)
Reinsurance contracts held [member] | Cash Inflow [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 11,155,186 9,290,398
Reinsurance contracts held [member] | Cash Inflow [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 322,122 225,165
Reinsurance contracts held [member] | Cash Inflow [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 302,044 216,544
Reinsurance contracts held [member] | Cash Inflow [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 286,274 209,995
Reinsurance contracts held [member] | Cash Inflow [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 278,232 207,721
Reinsurance contracts held [member] | Cash Inflow [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 271,893 207,575
Reinsurance contracts held [member] | Cash Inflow [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk 9,694,621 8,223,398
Reinsurance contracts held [member] | Cash Outflow [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (11,009,375) (10,290,911)
Reinsurance contracts held [member] | Cash Outflow [Member] | Less than 1 year [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (347,205) (244,930)
Reinsurance contracts held [member] | Cash Outflow [Member] | 1~2 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (334,989) (237,756)
Reinsurance contracts held [member] | Cash Outflow [Member] | 2~3 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (321,136) (230,883)
Reinsurance contracts held [member] | Cash Outflow [Member] | 3~4 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (312,211) (227,262)
Reinsurance contracts held [member] | Cash Outflow [Member] | 4~5 years [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk (305,518) (226,934)
Reinsurance contracts held [member] | Cash Outflow [Member] | 5 years or more [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Insurance Risk ₩ (9,388,316) ₩ (9,123,146)