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Risk Management - Summary of Reconciliation of Changes in Fair Value Measurement, Assets (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Changes in fair value measurement, assets |  |
Beginning balance | ₩ 25,175,820 |
Ending balance | 26,197,311 | ₩ 25,175,820
At fair value |  |
Changes in fair value measurement, assets |  |
Beginning balance | 4,214,122 |
Ending balance | 5,542,186 | 4,214,122
At fair value | Financial assets at fair value through profit or loss, category [member] |  |
Changes in fair value measurement, assets |  |
Beginning balance | 2,711,285 |
Ending balance | 2,176,172 | 2,711,285
At fair value | Financial assets at fair value through other comprehensive income, category [member] |  |
Changes in fair value measurement, assets |  |
Beginning balance | 502,443 |
Ending balance | 674,850 | 502,443
At fair value | Level 3 | Financial assets at fair value through profit or loss, category [member] | Cooperative [member] |  |
Changes in fair value measurement, assets |  |
Beginning balance | 6,735 | 6,329
Acquisition | 0 | 0
Reclassified category | 22 | 270
Valuation | 115 | 136
Disposal | 0 | 0
Foreign currency translation and others | 0 | 0
Ending balance | 6,872 | 6,735
At fair value | Level 3 | Financial assets at fair value through other comprehensive income, category [member] | Unlisted Securities [Member] |  |
Changes in fair value measurement, assets |  |
Beginning balance | 212,762 | 202,243
Acquisition | 4,000 | 9,550
Reclassified category | 0 | 0
Valuation | 88,256 | 5,445
Disposal | 0 | (5,332)
Foreign currency translation and others | 4,691 | 856
Ending balance | 309,709 | 212,762
At fair value | Level 3 | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [member] |  |
Changes in fair value measurement, assets |  |
Beginning balance | 4,627 | 529
Acquisition | 0 | 4,080
Reclassified category | 0 | 0
Valuation | 418 | 18
Disposal | 0 | 0
Foreign currency translation and others | 0 | 0
Ending balance | ₩ 5,045 | ₩ 4,627

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35H&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35M&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35N&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35I&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gains (losses) excluding exchange differences, recognised in other comprehensive income, on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_e_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2024-03-27 + Details
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