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Liability under insurance contracts and reinsurance contracts - Summary of insurance income and service expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of analysis of insurance revenue [line items]      
Insurance revenue ₩ 3,364,322 ₩ 3,116,553 ₩ 2,899,599
Insurance service expense subtotal 2,321,814 2,131,560 1,748,779
Reinsurance revenue 202,299 73,578 44,985
Reinsurance expenses 189,080 75,405 82,190
Income (expenses) from reinsurance contracts held, other than finance income (expenses) 1,055,727 983,166 1,113,615
Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Expected insurance claims and other expected insurance service expenses 1,759,178 1,655,435 1,573,969
Change in risk adjustment 185,968 130,423 116,545
Amortization of contractual service margin 913,213 923,714 914,643
Recoveries of insurance acquisition cash flows 422,286 360,411 262,280
Other (18,265) (17,984) (7,479)
Insurance revenue 3,262,380 3,051,999 2,859,958
Incurred claims and other incurred insurance service expenses 1,829,232 1,646,968 1,513,580
Changes in liabilities for incurred claims (26,729) 28,182 11,468
Losses on onerous contracts and reversals 4,135 67,934 (35,360)
Amortization of insurance acquisition cash flows 422,286 360,411 262,280
Other (27,485) (48,330) (37,596)
Insurance expenses 2,201,439 2,055,165 1,714,372
Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Insurance revenue 101,942 64,554 39,641
Insurance expenses 120,375 76,395 34,407
Reinsurance Contracts Other Than Those to Which Premium Allocation Approach Has Been Applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Incurred reinsurance claims 185,015 89,856 72,651
Changes in liabilities for incurred claims (34,225) (29,334) (32,100)
Other 14,184 (7,381) (116)
Reinsurance revenue 164,974 53,141 40,435
Expected reinsurance amount 76,710 53,008 48,861
Change in risk adjustment 6,729 3,927 3,853
Amortization of contractual service margin 32,682 (191) 15,389
Other 34,317 609 3,983
Reinsurance expenses 150,438 57,353 72,086
Reinsurance Contracts to Which Premium Allocation Approach Has Been Applied [Member]      
Disclosure of analysis of insurance revenue [line items]      
Reinsurance revenue 37,325 20,437 4,550
Reinsurance expenses 38,642 18,052 10,104
Retroactive modification method [member]      
Disclosure of analysis of insurance revenue [line items]      
Insurance revenue 1,276,352 1,418,878 1,513,551
Insurance service expense subtotal 869,168 997,340 876,050
Reinsurance revenue 9,420 20,615 4,578
Reinsurance expenses 17,796 18,052 5,375
Income (expenses) from reinsurance contracts held, other than finance income (expenses) 398,808 424,101 636,704
Retroactive modification method [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Expected insurance claims and other expected insurance service expenses 757,062 769,737 776,917
Change in risk adjustment 57,884 48,040 55,712
Amortization of contractual service margin 357,104 433,780 536,399
Recoveries of insurance acquisition cash flows 92,192 116,454 133,781
Other (11,306) (13,242) (18,762)
Insurance revenue 1,252,936 1,354,769 1,484,047
Incurred claims and other incurred insurance service expenses 761,109 775,573 794,824
Changes in liabilities for incurred claims (5,912) (2,310) (5,104)
Losses on onerous contracts and reversals (21,666) 42,867 (74,960)
Amortization of insurance acquisition cash flows 92,191 116,636 133,868
Other (9,665) (10,455) (10,235)
Insurance expenses 816,057 922,311 838,393
Retroactive modification method [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Insurance revenue 23,416 64,109 29,504
Insurance expenses 53,111 75,029 37,657
Retroactive modification method [member] | Reinsurance Contracts Other Than Those to Which Premium Allocation Approach Has Been Applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Incurred reinsurance claims 0 67 27
Changes in liabilities for incurred claims 0 58 2
Other 0 53 (1)
Reinsurance revenue 0 178 28
Expected reinsurance amount 0 0 0
Change in risk adjustment 0 0 0
Amortization of contractual service margin 0 0 0
Other 0 0 0
Reinsurance expenses 0 0 0
Retroactive modification method [member] | Reinsurance Contracts to Which Premium Allocation Approach Has Been Applied [Member]      
Disclosure of analysis of insurance revenue [line items]      
Reinsurance revenue 9,420 20,437 4,550
Reinsurance expenses 17,796 18,052 5,375
Fair value method [member]      
Disclosure of analysis of insurance revenue [line items]      
Insurance revenue 955,369 968,200 958,369
Insurance service expense subtotal 550,789 684,197 669,136
Reinsurance revenue 75,439 30,023 35,078
Reinsurance expenses 68,563 28,839 52,637
Income (expenses) from reinsurance contracts held, other than finance income (expenses) 411,456 285,187 271,674
Fair value method [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Expected insurance claims and other expected insurance service expenses 659,233 685,765 706,136
Change in risk adjustment 41,931 35,437 36,036
Amortization of contractual service margin 253,829 246,990 215,795
Recoveries of insurance acquisition cash flows 312 379 337
Other 64 (371) 65
Insurance revenue 955,369 968,200 958,369
Incurred claims and other incurred insurance service expenses 643,747 652,193 644,118
Changes in liabilities for incurred claims (24,832) 26,060 14,944
Losses on onerous contracts and reversals (70,108) 4,682 8,286
Amortization of insurance acquisition cash flows 312 379 337
Other 1,670 883 1,451
Insurance expenses 550,789 684,197 669,136
Fair value method [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Insurance revenue 0 0 0
Insurance expenses 0 0 0
Fair value method [member] | Reinsurance Contracts Other Than Those to Which Premium Allocation Approach Has Been Applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Incurred reinsurance claims 108,510 68,816 67,051
Changes in liabilities for incurred claims (32,864) (27,421) (29,952)
Other (207) (11,372) (2,021)
Reinsurance revenue 75,439 30,023 35,078
Expected reinsurance amount 37,115 39,319 41,537
Change in risk adjustment 3,552 2,861 3,227
Amortization of contractual service margin 10,697 (11,035) 8,120
Other 17,199 (2,306) (247)
Reinsurance expenses 68,563 28,839 52,637
Fair value method [member] | Reinsurance Contracts to Which Premium Allocation Approach Has Been Applied [Member]      
Disclosure of analysis of insurance revenue [line items]      
Reinsurance revenue 0 0 0
Reinsurance expenses 0 0 0
Other [member]      
Disclosure of analysis of insurance revenue [line items]      
Insurance revenue 1,132,601 729,475 427,679
Insurance service expense subtotal 901,857 450,023 203,593
Reinsurance revenue 117,440 22,940 5,329
Reinsurance expenses 102,721 28,514 24,178
Income (expenses) from reinsurance contracts held, other than finance income (expenses) 245,463 273,878 205,237
Other [member] | Insurance contracts other than those to which premium allocation approach has been applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Expected insurance claims and other expected insurance service expenses 342,883 199,933 90,916
Change in risk adjustment 86,153 46,946 24,797
Amortization of contractual service margin 302,280 242,944 162,449
Recoveries of insurance acquisition cash flows 329,782 243,578 128,162
Other (7,023) (4,371) 11,218
Insurance revenue 1,054,075 729,030 417,542
Incurred claims and other incurred insurance service expenses 424,376 219,202 74,638
Changes in liabilities for incurred claims 4,015 4,432 1,628
Losses on onerous contracts and reversals 95,909 20,385 31,314
Amortization of insurance acquisition cash flows 329,783 243,396 128,075
Other (19,490) (38,758) (28,812)
Insurance expenses 834,593 448,657 206,843
Other [member] | Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Insurance revenue 78,526 445 10,137
Insurance expenses 67,264 1,366 (3,250)
Other [member] | Reinsurance Contracts Other Than Those to Which Premium Allocation Approach Has Been Applied [member]      
Disclosure of analysis of insurance revenue [line items]      
Incurred reinsurance claims 76,505 20,973 5,573
Changes in liabilities for incurred claims (1,361) (1,971) (2,150)
Other 14,391 3,938 1,906
Reinsurance revenue 89,535 22,940 5,329
Expected reinsurance amount 39,595 13,689 7,324
Change in risk adjustment 3,177 1,066 626
Amortization of contractual service margin 21,985 10,844 7,269
Other 17,118 2,915 4,230
Reinsurance expenses 81,875 28,514 19,449
Other [member] | Reinsurance Contracts to Which Premium Allocation Approach Has Been Applied [Member]      
Disclosure of analysis of insurance revenue [line items]      
Reinsurance revenue 27,905 0 0
Reinsurance expenses ₩ 20,846 ₩ 0 ₩ 4,729