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Financial risk management - Foreign currency denominated financial assets and liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
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