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Financial risk management - Summary of offsetting financial liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Net amounts of financial liabilities presented:    
Gross amounts of recognized financial liabilities ₩ 104,011,536 ₩ 79,824,269
Gross amounts of recognized financial liabilities set off in the statement of financial position 45,466,182 36,987,470
Net amounts of financial liabilities presented in the statement of financial position 58,545,354 42,836,799
Related amounts not set off in the statement of financial position (Financial instruments) 45,754,656 29,379,959
Related amounts not set off in the statement of financial position (Cash collateral received) 1,000 1,000
Net amount 12,789,698 13,455,840
Derivatives    
Net amounts of financial liabilities presented:    
Gross amounts of recognized financial liabilities 13,236,855 18,245,590
Gross amounts of recognized financial liabilities set off in the statement of financial position 0 0
Net amounts of financial liabilities presented in the statement of financial position 13,236,855 18,245,590
Derivatives and other financial instruments    
Net amounts of financial liabilities presented:    
Gross amounts of recognized financial liabilities 17,773,129 8,215,343
Gross amounts of recognized financial liabilities set off in the statement of financial position 0 0
Net amounts of financial liabilities presented in the statement of financial position 17,773,129 8,215,343
Related amounts not set off in the statement of financial position (Financial instruments) 22,987,953 14,692,837
Related amounts not set off in the statement of financial position (Cash collateral received) 1,000 1,000
Net amount 8,021,031 11,767,096
Bonds sold under repurchase agreements    
Net amounts of financial liabilities presented:    
Gross amounts of recognized financial liabilities 14,988,698 11,542,956
Gross amounts of recognized financial liabilities set off in the statement of financial position 0 0
Net amounts of financial liabilities presented in the statement of financial position 14,988,698 11,542,956
Related amounts not set off in the statement of financial position (Financial instruments) 11,768,314 10,667,259
Related amounts not set off in the statement of financial position (Cash collateral received) 0 0
Net amount 3,220,384 875,697
Securities borrowed    
Net amounts of financial liabilities presented:    
Gross amounts of recognized financial liabilities 790,416 357,842
Gross amounts of recognized financial liabilities set off in the statement of financial position 0 0
Net amounts of financial liabilities presented in the statement of financial position 790,416 357,842
Related amounts not set off in the statement of financial position (Financial instruments) 790,416 357,842
Related amounts not set off in the statement of financial position (Cash collateral received) 0 0
Net amount 0 0
Domestic exchange settlement pending    
Net amounts of financial liabilities presented:    
Gross amounts of recognized financial liabilities 42,413,447 36,593,966
Gross amounts of recognized financial liabilities set off in the statement of financial position 38,218,494 34,787,860
Net amounts of financial liabilities presented in the statement of financial position 4,194,953 1,806,106
Related amounts not set off in the statement of financial position (Financial instruments) 4,097,860 1,735,983
Related amounts not set off in the statement of financial position (Cash collateral received) 0 0
Net amount 97,093 70,123
Payable from purchase of securities    
Net amounts of financial liabilities presented:    
Gross amounts of recognized financial liabilities 14,808,991 4,868,572
Gross amounts of recognized financial liabilities set off in the statement of financial position 7,247,688 2,199,610
Net amounts of financial liabilities presented in the statement of financial position 7,561,303 2,668,962
Related amounts not set off in the statement of financial position (Financial instruments) 6,110,113 1,926,038
Related amounts not set off in the statement of financial position (Cash collateral received) 0 0
Net amount ₩ 1,451,190 ₩ 742,924