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Derivatives - Effect of hedging items on statement financial position, statement of comprehensive income, statement of changes in equity (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Fair value hedges | Interest rate risk |  |  |  |
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] |  |  |  |
Carrying value of assets | [1] | ₩ 1,217,304 | ₩ 996,275 | ₩ 685,340
Carrying value of liabilities | [1] | 8,984,247 | 9,167,678 | 9,224,390
Assets of Cumulative fair value hedge adjustment |  | (7,991) | 11,271 | 41,643
Liabilities of Cumulative fair value hedge adjustment |  | (373,328) | (540,967) | (579,315)
Changes if fair value in the period |  | (120,061) | (45,264) | (240,965)
Cash flow hedge reserve |  | 0 | 0 | 0
Foreign currency conversion reserves |  | 0 | 0 | 0
Fair value hedges | Foreign Exchange Risk |  |  |  |
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] |  |  |  |
Carrying value of assets | [1] | 380,113 | 480,273 | 544,706
Carrying value of liabilities | [1] | 0 | 0 | 0
Assets of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Liabilities of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Changes if fair value in the period |  | 278 | 44,094 | 1,313
Cash flow hedge reserve |  | 0 | 0 | 0
Foreign currency conversion reserves |  | 0 | 0 | 0
Fair value hedges | Other Price Risk Loans [Member] |  |  |  |
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] |  |  |  |
Carrying value of assets | [1] | 0 | 5,809 | 5,809
Carrying value of liabilities | [1] | 0 | 0 | 0
Assets of Cumulative fair value hedge adjustment |  | (5,905) | (1,548) | (1,548)
Liabilities of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Changes if fair value in the period |  | (4,357) | (1,548) | (1,548)
Cash flow hedge reserve |  | 0 | 0 | 0
Foreign currency conversion reserves |  | 0 | 0 | 0
Cash Flow Hedges | Interest rate risk |  |  |  |
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] |  |  |  |
Carrying value of assets | [1] | 438,011 | 357,441 | 641,750
Carrying value of liabilities | [1] | 349,941 | 749,708 | 1,029,542
Assets of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Liabilities of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Changes if fair value in the period |  | 2,303 | (3,449) | (11,068)
Cash flow hedge reserve |  | (187,801) | 25,943 | 26,648
Foreign currency conversion reserves |  | 0 | 0 | 0
Cash Flow Hedges | Foreign Exchange Risk |  |  |  |
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] |  |  |  |
Carrying value of assets | [1] | 3,629,809 | 2,971,800 | 2,490,098
Carrying value of liabilities | [1] | 6,030,836 | 5,045,127 | 2,342,230
Assets of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Liabilities of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Changes if fair value in the period |  | 234,512 | 773,828 | 69,784
Cash flow hedge reserve |  | (57,429) | (8,638) | (17,812)
Foreign currency conversion reserves |  | 0 | 0 | 0
Hedges of net investment | Foreign Exchange Risk |  |  |  |
Disclosure of information about amounts that affected statement of comprehensive income as result of hedge accounting [line items] |  |  |  |
Carrying value of assets | [1] | 0 | 0 | 0
Carrying value of liabilities | [1] | 0 | 0 | 0
Assets of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Liabilities of Cumulative fair value hedge adjustment |  | 0 | 0 | 0
Changes if fair value in the period |  | (59,096) | 221,221 | 3,903
Cash flow hedge reserve |  | 0 | 0 | 0
Foreign currency conversion reserves |  | ₩ 125,194 | ₩ 184,291 | ₩ (36,931)
[1] | The related account categories are presented in the amounts of borrowings, bonds, and others.

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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as an asset. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_ii&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 61 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_ii&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 61 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as a liability. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_ii&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 61 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_ii&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 61 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_iv&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 61 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_iv&doctype=Standard -URIDate 2025-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 61 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of a hedged item, recognised as an asset. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_i&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 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_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 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of a hedged item, recognised as a liability. [Refer: Hedged items [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_a_i&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 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_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 61 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_61_a_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_b_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition A component of equity representing the reserve of exchange differences on translation in relation to continuing hedges. [Refer: Reserve of exchange differences on translation] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 24B -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_b_ii&doctype=Standard -URIDate 2025-03-27 + Details
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