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Financial risk management - Classification by categories of financial assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
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