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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
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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

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