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Equity - Accumulated other comprehensive income (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | ₩ (1,824,440) | ₩ (1,074,453) | ₩ (1,910,750)
Change due to fair value | (448,451) | (1,645,009) | 888,183
Reclassification: |  |  |
Change due to impairment or disposal | (46,631) | 119,001 | 474,619
Effect of hedge accounting | (27,149) | (582,424) | (69,484)
Hedging | (176,318) | 383,053 | 120,980
Effects from changes in foreign exchange rate | (199,186) | 629,914 | 5,178
Remeasurements of the net defined benefit plans | (181) | (83,937) | (272,792)
Deferred income taxes | 244,402 | 433,737 | (302,295)
Transfer to other account | 830 | (2,673) | (4,297)
Non-controlling interests | 2,311 | (1,649) | (3,795)
Ending balance | (2,474,813) | (1,824,440) | (1,074,453)
Gain (loss) on securities at FVOCI |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | (2,482,668) | (3,628,434) | (6,786,650)
Change due to fair value | (2,181,955) | 1,465,249 | 3,862,277
Reclassification: |  |  |
Change due to impairment or disposal | (47,293) | 119,594 | 465,343
Effect of hedge accounting | 0 | 0 | 0
Hedging | (19,262) | (30,371) | (28,044)
Effects from changes in foreign exchange rate | 0 | 0 | 0
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | 648,218 | (407,849) | (1,137,032)
Transfer to other account | 0 | 0 | 0
Non-controlling interests | 1,716 | (857) | (4,328)
Ending balance | (4,081,244) | (2,482,668) | (3,628,434)
Equity in other comprehensive income (loss) of associates |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | 5,692 | (979) | (8,135)
Change due to fair value | (24,731) | 16,732 | 9,738
Reclassification: |  |  |
Change due to impairment or disposal | 662 | 0 | 0
Effect of hedge accounting | 0 | 0 | 0
Hedging | 0 | 0 | 0
Effects from changes in foreign exchange rate | 1,107 | (7,668) | 0
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | 6,226 | (2,393) | (2,582)
Transfer to other account | 0 | 0 | 0
Non-controlling interests | 0 | 0 | 0
Ending balance | (11,044) | 5,692 | (979)
Foreign currency translation adjustments for foreign operations |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | 296,489 | (118,517) | (112,283)
Change due to fair value | 0 | 0 | 0
Reclassification: |  |  |
Change due to impairment or disposal | 0 | (593) | 0
Effect of hedge accounting | 0 | 0 | 0
Hedging | 59,096 | (221,221) | (3,903)
Effects from changes in foreign exchange rate | (199,597) | 624,565 | 2,316
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | (3,787) | 13,431 | (4,658)
Transfer to other account | 0 | 0 | 0
Non-controlling interests | 338 | (1,176) | 11
Ending balance | 152,539 | 296,489 | (118,517)
Net gain (loss) from cash flow hedges |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | 3,406 | (35,108) | (96,388)
Change due to fair value | 0 | 0 | 0
Reclassification: |  |  |
Change due to impairment or disposal | 0 | 0 | 0
Effect of hedge accounting | (27,149) | (582,424) | (69,484)
Hedging | (216,152) | 634,645 | 152,927
Effects from changes in foreign exchange rate | 0 | 0 | 0
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | 70,198 | (13,707) | (22,163)
Transfer to other account | 0 | 0 | 0
Non-controlling interests | 0 | 0 | 0
Ending balance | (169,697) | 3,406 | (35,108)
Net finance Income (expense) on insurance contract assets (liabilities) |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | 532,388 | 2,866,623 | 5,039,081
Change due to fair value | 1,748,614 | (3,171,476) | (2,961,019)
Reclassification: |  |  |
Change due to impairment or disposal | 0 | 0 | 0
Effect of hedge accounting | 0 | 0 | 0
Hedging | 0 | 0 | 0
Effects from changes in foreign exchange rate | 0 | 0 | 0
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | (479,728) | 837,241 | 788,561
Transfer to other account | 0 | 0 | 0
Non-controlling interests | 0 | 0 | 0
Ending balance | 1,801,274 | 532,388 | 2,866,623
Remeasure-ments of the defined benefit plans |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | (354,087) | (292,328) | (91,993)
Change due to fair value | 0 | 0 | 0
Reclassification: |  |  |
Change due to impairment or disposal | 0 | 0 | 0
Effect of hedge accounting | 0 | 0 | 0
Hedging | 0 | 0 | 0
Effects from changes in foreign exchange rate | 0 | 0 | 0
Remeasurements of the net defined benefit plans | (181) | (83,937) | (272,792)
Deferred income taxes | 5,505 | 21,794 | 71,935
Transfer to other account | 0 | 0 | 0
Non-controlling interests | 257 | 384 | 522
Ending balance | (348,506) | (354,087) | (292,328)
Net finance Income (expense) on reinsurance contract assets (liabilities) |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | 11,750 | 13,273 | 34,045
Change due to fair value | (211,730) | (2,077) | (28,283)
Reclassification: |  |  |
Change due to impairment or disposal | 0 | 0 | 0
Effect of hedge accounting | 0 | 0 | 0
Hedging | 0 | 0 | 0
Effects from changes in foreign exchange rate | 0 | 0 | 0
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | 58,047 | 554 | 7,511
Transfer to other account | 0 | 0 | 0
Non-controlling interests | 0 | 0 | 0
Ending balance | (141,933) | 11,750 | 13,273
Equity in other comprehensive income (expense) of associates |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | 9 | 9 | 9
Change due to fair value | 0 | 0 | 0
Reclassification: |  |  |
Change due to impairment or disposal | 0 | 0 | 0
Effect of hedge accounting | 0 | 0 | 0
Hedging | 0 | 0 | 0
Effects from changes in foreign exchange rate | 0 | 0 | 0
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | 0 | 0 | 0
Transfer to other account | 0 | 0 | 0
Non-controlling interests | 0 | 0 | 0
Ending balance | 9 | 9 | 9
Gain (loss) on securities at FVOCI |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | 168,150 | 124,892 | 116,719
Change due to fair value | 225,514 | 55,179 | 1,459
Reclassification: |  |  |
Change due to impairment or disposal | 0 | 0 | 4,199
Effect of hedge accounting | 0 | 0 | 0
Hedging | 0 | 0 | 0
Effects from changes in foreign exchange rate | (696) | 13,017 | 2,862
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | (61,788) | (17,609) | (3,402)
Transfer to other account | (2,923) | (7,329) | 3,055
Non-controlling interests | 0 | 0 | 0
Ending balance | 328,257 | 168,150 | 124,892
Gain (loss) on financial liabilities designated at FVTPL attributable to changes in credit risk |  |  |
Accumulated other comprehensive income [Line Items] |  |  |
Beginning balance | (5,569) | (3,884) | (5,155)
Change due to fair value | (4,163) | (8,616) | 4,011
Reclassification: |  |  |
Change due to impairment or disposal | 0 | 0 | 5,077
Effect of hedge accounting | 0 | 0 | 0
Hedging | 0 | 0 | 0
Effects from changes in foreign exchange rate | 0 | 0 | 0
Remeasurements of the net defined benefit plans | 0 | 0 | 0
Deferred income taxes | 1,511 | 2,275 | (465)
Transfer to other account | 3,753 | 4,656 | (7,352)
Non-controlling interests | 0 | 0 | 0
Ending balance | ₩ (4,468) | ₩ (5,569) | ₩ (3,884)

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