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Derivatives - Due to the ineffectiveness of hedge of cash flow risk and hedge of net investment in foreign operations during the year (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Cash Flow Hedges | Interest rate risk |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |
Gains (losses) on hedges recognized in other comprehensive income | [1] | ₩ (209,145) | ₩ 89,293 | ₩ 99,268
Hedge ineffectiveness recognized in profit or loss | [1],[2] | (8,743) | (5,034) | (512)
From cash flow hedge reserve to profit or loss Reclassified amount | [1] | 1,567 | (151) | (1,760)
Cash Flow Hedges | Foreign Exchange Risk |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |
Gains (losses) on hedges recognized in other comprehensive income | [1] | (35,688) | 2,548 | (10,294)
Hedge ineffectiveness recognized in profit or loss | [1],[2] | 2,776 | (6,184) | (7,069)
From cash flow hedge reserve to profit or loss Reclassified amount | [1] | (160,443) | 210,424 | (25,698)
Cash Flow Hedges | Discontinuation of cash flow hedges |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |
Gains (losses) on hedges recognized in other comprehensive income |  | 1,532 | (39,621) | (5,531)
Hedge ineffectiveness recognized in profit or loss | [2] |  |  | 0
From cash flow hedge reserve to profit or loss Reclassified amount |  | (28) | 47,957 | 14,659
Hedges of net investment |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |
Gains (losses) on hedges recognized in other comprehensive income |  | (184,205) | (169,001) | 79,540
Hedge ineffectiveness recognized in profit or loss | [2] | 15,455 | (12,409) | (3,908)
From cash flow hedge reserve to profit or loss Reclassified amount |  | (158,904) | 258,230 | (12,799)
Hedges of net investment | Foreign Exchange Risk |  |  |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |  |  |
Gains (losses) on hedges recognized in other comprehensive income | [1] | 59,096 | (221,221) | (3,903)
Hedge ineffectiveness recognized in profit or loss | [1],[2] | 21,422 | (1,191) | 3,673
From cash flow hedge reserve to profit or loss Reclassified amount | [1] | ₩ 0 | ₩ 0 | ₩ 0
[1] | The related account categories are presented in the amounts of interest rate swap assets and liabilities, currency forwards assets and liabilities and borrowings.
[2] | Hedging ineffectiveness represents the difference between the changes in fair value of the hedging instruments and the hedged items.

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- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 62 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_62_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24C_a_i&doctype=Standard -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 62 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_62_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of reclassification adjustments on cash flow hedges for which the hedged future cash flows are no longer expected to occur, net of tax. [Refer: Reclassification adjustments on cash flow hedges, net of tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24E -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24C -Subparagraph b -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24C_b_iv&doctype=Standard -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 62 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_62_b_iii&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 62 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_62_b_iii&doctype=Standard -URIDate 2025-03-27 + Details
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