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Goodwill and Other Intangible Assets, Net - Summary of Goodwill and Other Intangible Assets (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | ₩ 5,493,529 | ₩ 4,774,824 | ₩ 4,714,784
Goodwill [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 826,772 | 357,851 | 403,172
Intellectual property rights [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 3,375,658 | 3,247,517 | 3,029,651
Memberships [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 139,238 | 136,108 | 138,184
Development expense [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 200,753 | 95,041 | 126,818
Port facilities usage rights [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 153,152 | 167,996 | 182,411
Exploration and evaluation assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 147,013 | 115,309 | 163,446
Development assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 83,341 | 86,711 | 10,235
Customer relationships [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 116,246 | 145,699 | 196,895
Other intangible assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 451,356 | 422,592 | ₩ 463,972
Gross amount [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 12,599,401 | 11,418,529 |
Gross amount [member] | Goodwill [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 2,191,311 | 1,722,390 |
Gross amount [member] | Intellectual property rights [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 6,119,689 | 5,670,769 |
Gross amount [member] | Memberships [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 141,506 | 137,619 |
Gross amount [member] | Development expense [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 903,361 | 742,816 |
Gross amount [member] | Port facilities usage rights [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 681,530 | 681,530 |
Gross amount [member] | Exploration and evaluation assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 322,795 | 276,599 |
Gross amount [member] | Development assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 83,664 | 86,792 |
Gross amount [member] | Customer relationships [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 871,650 | 859,035 |
Gross amount [member] | Other intangible assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | 1,283,895 | 1,240,979 |
Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (7,105,721) | (6,643,585) |
Government grants | (151) | (120) |
Accumulated depreciation, amortization and impairment [member] | Goodwill [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (1,364,539) | (1,364,539) |
Accumulated depreciation, amortization and impairment [member] | Intellectual property rights [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (2,744,031) | (2,423,252) |
Accumulated depreciation, amortization and impairment [member] | Memberships [Member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (2,268) | (1,511) |
Accumulated depreciation, amortization and impairment [member] | Development expense [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (702,608) | (647,701) |
Government grants |  | (74) |
Accumulated depreciation, amortization and impairment [member] | Port facilities usage rights [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (528,378) | (513,534) |
Accumulated depreciation, amortization and impairment [member] | Exploration and evaluation assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (175,782) | (161,290) |
Accumulated depreciation, amortization and impairment [member] | Development assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (323) | (81) |
Accumulated depreciation, amortization and impairment [member] | Customer relationships [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (755,404) | (713,336) |
Accumulated depreciation, amortization and impairment [member] | Other intangible assets [member] |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Goodwill and other intangible assets | (832,388) | (818,341) |
Government grants | ₩ (151) | ₩ (46) |

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