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Financial risk management - Classification by categories of financial assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Classification by categories of financial assets [Line Items] |  |
Cash and due from banks at Amortized cost | ₩ 39,742,605 | ₩ 40,525,712
Due from banks at FVTPL | 40,862 | 35,450
Securities at FVTPL | 76,597,261 | 70,231,449
Derivatives assets | 7,153,950 | 10,279,257
Loans at FVTPL | 1,415,254 | 1,879,946
Loans at amortized cost | 464,773,880 | 449,295,238
Securities at FVOCI | 103,216,950 | 93,805,369
Securities at amortized cost | 31,944,368 | 33,315,999
Others | 43,323,340 | 23,116,960
Financial assets, Total | 768,208,470 | 722,485,380
Financial asset at FVTPL |  |
Classification by categories of financial assets [Line Items] |  |
Cash and due from banks at Amortized cost | 0 | 0
Due from banks at FVTPL | 40,862 | 35,450
Securities at FVTPL | 76,597,261 | 70,231,449
Derivatives assets | 6,536,859 | 9,576,896
Loans at FVTPL | 1,415,254 | 1,879,946
Loans at amortized cost | 0 | 0
Securities at FVOCI | 0 | 0
Securities at amortized cost | 0 | 0
Others | 0 | 0
Financial assets, Total | 84,590,236 | 81,723,741
Financial assets at FVOCI |  |
Classification by categories of financial assets [Line Items] |  |
Cash and due from banks at Amortized cost | 0 | 0
Due from banks at FVTPL | 0 | 0
Securities at FVTPL | 0 | 0
Derivatives assets | 0 | 0
Loans at FVTPL | 0 | 0
Loans at amortized cost | 0 | 0
Securities at FVOCI | 103,216,950 | 93,805,369
Securities at amortized cost | 0 | 0
Others | 0 | 0
Financial assets, Total | 103,216,950 | 93,805,369
Financial assets at amortised cost |  |
Classification by categories of financial assets [Line Items] |  |
Cash and due from banks at Amortized cost | 39,742,605 | 40,525,712
Due from banks at FVTPL | 0 | 0
Securities at FVTPL | 0 | 0
Derivatives assets | 0 | 0
Loans at FVTPL | 0 | 0
Loans at amortized cost | 464,773,880 | 449,295,238
Securities at FVOCI | 0 | 0
Securities at amortized cost | 31,944,368 | 33,315,999
Others | 43,323,340 | 23,116,960
Financial assets, Total | 579,784,193 | 546,253,909
Derivatives held for hedging |  |
Classification by categories of financial assets [Line Items] |  |
Cash and due from banks at Amortized cost | 0 | 0
Due from banks at FVTPL | 0 | 0
Securities at FVTPL | 0 | 0
Derivatives assets | 617,091 | 702,361
Loans at FVTPL | 0 | 0
Loans at amortized cost | 0 | 0
Securities at FVOCI | 0 | 0
Securities at amortized cost | 0 | 0
Others | 0 | 0
Financial assets, Total | ₩ 617,091 | ₩ 702,361

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