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Income tax expense - Summary of deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | ₩ (218,315) | ₩ (388,876) |
Profit or loss | (273,502) | (254,118) |
Other comprehensive income (loss) | 254,736 | 424,679 | ₩ (307,868)
Ending balance | (237,081) | (218,315) | (388,876)
Temporary Difference |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (398,818) | (589,544) |
Profit or loss | (251,487) | (233,953) |
Other comprehensive income (loss) | 254,736 | 424,679 |
Ending balance | (395,569) | (398,818) | (589,544)
Unearned income |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (430,175) | (432,276) |
Profit or loss | (23,729) | 2,101 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | (453,904) | (430,175) | (432,276)
Account receivable |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (36,406) | (21,354) |
Profit or loss | (5,060) | (15,052) |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | (41,466) | (36,406) | (21,354)
Financial assets measured at fair value |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (379,605) | 454,253 |
Profit or loss | 76,414 | (408,640) |
Other comprehensive income (loss) | 585,988 | (425,218) |
Ending balance | 282,797 | (379,605) | 454,253
Investment in associates |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 194,415 | 188,268 |
Profit or loss | (18,848) | 8,543 |
Other comprehensive income (loss) | 6,229 | (2,396) |
Ending balance | 181,796 | 194,415 | 188,268
Valuation and depreciation of property and equipment, etc. |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (103,931) | (104,078) |
Profit or loss | (959) | 147 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | (104,890) | (103,931) | (104,078)
Derivative asset |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 51,184 | 152,388 |
Profit or loss | (70,745) | (79,962) |
Other comprehensive income (loss) | 82,890 | (21,242) |
Ending balance | 63,329 | 51,184 | 152,388
Deposits |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 27,279 | 33,553 |
Profit or loss | 9,677 | (6,274) |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | 36,956 | 27,279 | 33,553
Accrued expenses |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 286,029 | 221,458 |
Profit or loss | 40,172 | 64,571 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | 326,201 | 286,029 | 221,458
Defined benefit obligation |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 547,095 | 544,667 |
Profit or loss | 35,686 | (17,567) |
Other comprehensive income (loss) | (8,532) | 19,995 |
Ending balance | 574,249 | 547,095 | 544,667
Plan assets |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (583,708) | (617,983) |
Profit or loss | (76,062) | 32,565 |
Other comprehensive income (loss) | 13,930 | 1,710 |
Ending balance | (645,840) | (583,708) | (617,983)
Other provisions |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 495,417 | 510,604 |
Profit or loss | 12,464 | (15,187) |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | 507,881 | 495,417 | 510,604
Allowance for acceptances and guarantees |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 35,484 | 22,017 |
Profit or loss | 12,713 | 13,467 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | 48,197 | 35,484 | 22,017
Allowance related to asset revaluation |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (47,709) | (47,709) |
Profit or loss | (1,999) | 0 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | (49,708) | (47,709) | (47,709)
Allowance for expensing depreciation |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (79) | (140) |
Profit or loss | 61 | 61 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | (18) | (79) | (140)
Accrued contributions |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 57,604 | 37,669 |
Profit or loss | (1,561) | 19,935 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | 56,043 | 57,604 | 37,669
Financial assets (liabilities) designated at fair value through profit or loss |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (112,939) | (232,597) |
Profit or loss | (14,065) | 119,658 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | (127,004) | (112,939) | (232,597)
Allowances |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 274,218 | 224,066 |
Profit or loss | (49,538) | 50,152 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | 224,680 | 274,218 | 224,066
Constructive dividend |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 18,575 | 17,718 |
Profit or loss | 848 | 857 |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | 19,423 | 18,575 | 17,718
Liability under insurance contracts |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 10,356 | 11,445 |
Profit or loss | (1,510) | (1,089) |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | 8,846 | 10,356 | 11,445
Others |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (701,922) | (1,551,513) |
Profit or loss | (175,446) | (2,239) |
Other comprehensive income (loss) | (425,769) | 851,830 |
Ending balance | (1,303,137) | (701,922) | (1,551,513)
Extinguishment of deposit and insurance liabilities |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 180,503 | 200,668 |
Profit or loss | (22,015) | (20,165) |
Other comprehensive income (loss) | 0 | 0 |
Ending balance | ₩ 158,488 | ₩ 180,503 | ₩ 200,668

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