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

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- Definition The amount of cash collateral received that is subject to an enforceable master netting arrangement or similar agreement and that is not set off against financial assets. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph IG40D -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_IG40D&doctype=Implementation%20Guidance -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 13C -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_13C_d_ii&doctype=Standard -URIDate 2025-03-27 + Details
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