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Financial risk management - Foreign currency denominated financial assets and liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | ₩ 137,073,765 | ₩ 117,959,050
Cash and due from banks at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 24,071,164 | 21,672,763
Due from banks at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 40,862 | 35,450
Loans at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 122,218 | 323,562
Loans at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 64,308,431 | 60,913,887
Securities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 10,729,148 | 8,404,286
Derivative assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,207,738 | 1,905,084
Financial assets at FVOCI |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 18,319,459 | 14,245,024
Securities at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,037,603 | 2,339,195
Other financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 16,237,142 | 8,119,799
Financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 127,088,134 | 109,510,982
Deposits |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 73,887,124 | 65,731,420
Financial liabilities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,522,071 | 600,175
Derivative liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 867,237 | 1,626,146
Borrowings |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 15,950,616 | 12,711,220
Debt securities issued |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 18,111,360 | 18,725,149
Financial liabilities designated at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 790,960 | 804,637
Other financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 15,958,766 | 9,312,235
Net domestic and foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 9,985,631 | 8,448,068
Off-balance derivative exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 681,050 | 1,186,487
Net foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 10,666,681 | 9,634,555
USD | Financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 72,598,349 | 62,999,040
USD | Cash and due from banks at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 14,268,193 | 12,337,661
USD | Due from banks at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 40,862 | 35,450
USD | Loans at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 108,450 | 275,434
USD | Loans at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 25,860,570 | 25,948,190
USD | Securities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 8,324,763 | 6,687,351
USD | Derivative assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 815,479 | 1,568,025
USD | Financial assets at FVOCI |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 13,004,888 | 10,334,842
USD | Securities at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 368,841 | 340,153
USD | Other financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 9,806,303 | 5,471,934
USD | Financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 70,396,581 | 62,695,847
USD | Deposits |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 31,663,691 | 28,517,193
USD | Financial liabilities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk |  | 3,117
USD | Derivative liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 641,622 | 1,513,732
USD | Borrowings |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 11,990,792 | 9,498,518
USD | Debt securities issued |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 13,715,798 | 15,926,430
USD | Financial liabilities designated at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 790,960 | 804,324
USD | Other financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 11,593,718 | 6,432,533
USD | Net domestic and foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,201,768 | 303,193
USD | Off-balance derivative exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,736,104 | 2,433,296
USD | Net foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 4,937,872 | 2,736,489
JPY | Financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 21,073,667 | 18,099,807
JPY | Cash and due from banks at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 3,024,755 | 2,952,548
JPY | Loans at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 14,457,433 | 13,073,162
JPY | Securities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 137,035 | 133,864
JPY | Derivative assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,217 | 4,578
JPY | Financial assets at FVOCI |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 312,632 | 171,177
JPY | Securities at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 432,333 | 500,269
JPY | Other financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,707,262 | 1,264,209
JPY | Financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 20,600,538 | 18,199,083
JPY | Deposits |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 18,053,711 | 15,642,126
JPY | Derivative liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 5,000 | 5,297
JPY | Borrowings |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,253,386 | 1,446,603
JPY | Debt securities issued |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 426,698 | 168,566
JPY | Financial liabilities designated at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk |  | 313
JPY | Other financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 861,743 | 936,178
JPY | Net domestic and foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 473,129 | (99,276)
JPY | Off-balance derivative exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 425,121 | 1,085,962
JPY | Net foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 898,250 | 986,686
EUR | Financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 6,367,871 | 3,927,891
EUR | Cash and due from banks at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 193,635 | 263,878
EUR | Loans at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 9,635 | 28,229
EUR | Loans at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,117,346 | 1,832,150
EUR | Securities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,012,815 | 852,382
EUR | Derivative assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 304,637 | 232,197
EUR | Financial assets at FVOCI |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 944,285 | 521,289
EUR | Other financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,785,518 | 197,766
EUR | Financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 5,709,946 | 2,517,909
EUR | Deposits |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,208,668 | 1,194,240
EUR | Derivative liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 145,204 | 50,101
EUR | Borrowings |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 459,326 | 280,140
EUR | Debt securities issued |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,985,414 | 764,365
EUR | Other financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 911,334 | 229,063
EUR | Net domestic and foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 657,925 | 1,409,982
EUR | Off-balance derivative exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 275,984 | (397,997)
EUR | Net foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 933,909 | 1,011,985
CNY | Financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 6,551,524 | 6,764,730
CNY | Cash and due from banks at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 615,220 | 731,304
CNY | Loans at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 4,891,534 | 4,873,899
CNY | Securities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,750 | 4,124
CNY | Derivative assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 881 | 1,987
CNY | Financial assets at FVOCI |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 743,545 | 681,404
CNY | Securities at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 96,420 | 117,008
CNY | Other financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 201,174 | 355,004
CNY | Financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 5,697,019 | 5,900,548
CNY | Deposits |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 4,903,374 | 5,245,526
CNY | Derivative liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,077 | 1,964
CNY | Borrowings |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 6,388 | 544
CNY | Other financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 786,180 | 652,514
CNY | Net domestic and foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 854,505 | 864,182
CNY | Off-balance derivative exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | (1,783) | (379,652)
CNY | Net foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 852,722 | 484,530
Other | Financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 30,482,354 | 26,167,582
Other | Cash and due from banks at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 5,969,361 | 5,387,372
Other | Loans at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 4,133 | 19,899
Other | Loans at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 16,981,548 | 15,186,486
Other | Securities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,251,785 | 726,565
Other | Derivative assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 84,524 | 98,297
Other | Financial assets at FVOCI |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 3,314,109 | 2,536,312
Other | Securities at amortized cost |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,140,009 | 1,381,765
Other | Other financial assets |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,736,885 | 830,886
Other | Financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 24,684,050 | 20,197,595
Other | Deposits |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 17,057,680 | 15,132,335
Other | Financial liabilities at FVTPL |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,522,071 | 597,058
Other | Derivative liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 74,334 | 55,052
Other | Borrowings |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 2,240,724 | 1,485,415
Other | Debt securities issued |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,983,450 | 1,865,788
Other | Other financial liabilities |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 1,805,791 | 1,061,947
Other | Net domestic and foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | 5,798,304 | 5,969,987
Other | Off-balance derivative exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | (2,754,376) | (1,555,122)
Other | Net foreign currency exposure |  |
Foreign currency denominated financial assets and liabilities [Line Items] |  |
Foreign exchange risk | ₩ 3,043,928 | ₩ 4,414,865

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