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Financial risk management - Summary of offsetting financial assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Net amounts of financial assets presented:    
Gross amounts of recognized financial assets ₩ 105,275,885 ₩ 88,407,445
Gross amounts of recognized financial liabilities set off in the statement of financial position 45,466,182 36,987,470
Net amounts of financial assets presented in the statement of financial position 59,809,703 51,419,975
Related amounts not set off in the statement of financial position (Financial instruments) 43,795,783 37,303,089
Related amounts not set off in the statement of financial position (Cash collateral received) 425,193 522,860
Net amount 15,588,727 13,594,026
Derivatives    
Net amounts of financial assets presented:    
Gross amounts of recognized financial assets 7,215,469 10,560,214
Gross amounts of recognized financial liabilities set off in the statement of financial position 0 0
Net amounts of financial assets presented in the statement of financial position 7,215,469 10,560,214
Derivatives and other financial instruments    
Net amounts of financial assets presented:    
Gross amounts of recognized financial assets 18,119,366 9,299,807
Gross amounts of recognized financial liabilities set off in the statement of financial position 0 0
Net amounts of financial assets presented in the statement of financial position 18,119,366 9,299,807
Related amounts not set off in the statement of financial position (Financial instruments) 22,362,966 13,744,859
Related amounts not set off in the statement of financial position (Cash collateral received) 425,193 522,860
Net amount 2,546,676 5,592,302
Bonds sold under repurchase agreements    
Net amounts of financial assets presented:    
Gross amounts of recognized financial assets 14,417,309 17,514,396
Gross amounts of recognized financial liabilities set off in the statement of financial position 0 0
Net amounts of financial assets presented in the statement of financial position 14,417,309 17,514,396
Related amounts not set off in the statement of financial position (Financial instruments) 14,220,871 15,238,643
Related amounts not set off in the statement of financial position (Cash collateral received) 0 0
Net amount 196,438 2,275,753
Securities loaned    
Net amounts of financial assets presented:    
Gross amounts of recognized financial assets 1,274,760 6,456,316
Gross amounts of recognized financial liabilities set off in the statement of financial position 0 0
Net amounts of financial assets presented in the statement of financial position 1,274,760 6,456,316
Related amounts not set off in the statement of financial position (Financial instruments) 1,101,854 6,393,972
Related amounts not set off in the statement of financial position (Cash collateral received) 0 0
Net amount 172,906 62,344
Domestic exchange settlement debit    
Net amounts of financial assets presented:    
Gross amounts of recognized financial assets 49,477,452 39,697,639
Gross amounts of recognized financial liabilities set off in the statement of financial position 38,218,494 34,787,860
Net amounts of financial assets presented in the statement of financial position 11,258,958 4,909,779
Related amounts not set off in the statement of financial position (Financial instruments) 0 0
Related amounts not set off in the statement of financial position (Cash collateral received) 0 0
Net amount 11,258,958 4,909,779
Receivables from disposal of securities    
Net amounts of financial assets presented:    
Gross amounts of recognized financial assets 14,771,529 4,879,073
Gross amounts of recognized financial liabilities set off in the statement of financial position 7,247,688 2,199,610
Net amounts of financial assets presented in the statement of financial position 7,523,841 2,679,463
Related amounts not set off in the statement of financial position (Financial instruments) 6,110,092 1,925,615
Related amounts not set off in the statement of financial position (Cash collateral received) 0 0
Net amount ₩ 1,413,749 ₩ 753,848