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Financial risk management - Summary of offsetting financial liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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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

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