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Provisions - Summary of provisions (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Provisions [Line Items] |  |  |
Provisions | ₩ 1,363,345 | ₩ 1,308,896 |
Asset retirement obligations |  |  |
Provisions [Line Items] |  |  |
Provisions | 106,125 | 99,306 | ₩ 99,927
Expected loss related to litigation |  |  |
Provisions [Line Items] |  |  |
Provisions | 144,173 | 114,750 | 31,371
Unused credit commitments |  |  |
Provisions [Line Items] |  |  |
Provisions | 305,955 | 411,275 |
Guarantee contracts issued |  |  |
Provisions [Line Items] |  |  |
Provisions | 111,307 | 104,451 |
Financial guarantee contracts |  |  |
Provisions [Line Items] |  |  |
Provisions | 93,693 | 87,088 |
Non-financial guarantee contracts issued |  |  |
Provisions [Line Items] |  |  |
Provisions | 17,614 | 17,363 |
Other |  |  |
Provisions [Line Items] |  |  |
Provisions | ₩ 695,785 | ₩ 579,114 | ₩ 819,616

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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 84 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_84_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph B9 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B9_e&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 257 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_a&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 257 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_257_a&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 78 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78_d&doctype=Standard -URIDate 2025-03-27 + Details
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