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Investment Property, Net - Summary of Investment Property (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about investment property [line items] |  |  |
Investment property | ₩ 1,691,625 | ₩ 1,955,896 | ₩ 1,616,294
Land [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 794,740 | 866,450 | 787,304
Buildings [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 752,471 | 942,851 | 655,786
Structures [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 1,210 | 1,755 | 1,873
Right of use assets [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 143,204 | 144,840 | ₩ 171,331
Gross amount [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 2,001,417 | 2,242,009 |
Gross amount [member] | Land [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 804,839 | 876,549 |
Gross amount [member] | Buildings [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 1,002,446 | 1,173,721 |
Gross amount [member] | Structures [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 2,455 | 3,342 |
Gross amount [member] | Right of use assets [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | 191,677 | 188,397 |
Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | (309,792) | (286,113) |
Accumulated depreciation, amortization and impairment [member] | Land [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | (10,099) | (10,099) |
Accumulated depreciation, amortization and impairment [member] | Buildings [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | (249,975) | (230,870) |
Accumulated depreciation, amortization and impairment [member] | Structures [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | (1,245) | (1,587) |
Accumulated depreciation, amortization and impairment [member] | Right of use assets [member] |  |  |
Disclosure of detailed information about investment property [line items] |  |  |
Investment property | ₩ (48,473) | ₩ (43,557) |

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- Definition The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2025-01-01 -Paragraph 76 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_76&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2025-01-01 -Paragraph 79 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_79_d&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 269 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_269&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 271 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_271_d&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 269 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_269&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 271 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_271_d&doctype=Standard -URIDate 2025-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_b&doctype=Standard -URIDate 2025-03-27 + Details
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