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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | ₩ 42,292,820 | ₩ 39,846,828 | ₩ 35,206,248
Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 99,520,984 | 94,080,403 |
Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (57,133,280) | (54,160,363) |
Government grants | (94,884) | (73,212) |
Land [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 3,686,386 | 3,335,875 | 3,290,244
Land [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 3,700,385 | 3,353,019 |
Land [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (8,261) | (12,144) |
Government grants | (5,738) | (5,000) |
Buildings [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 5,793,840 | 5,280,968 | 4,427,632
Buildings [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 12,970,144 | 12,097,246 |
Buildings [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (7,164,018) | (6,808,735) |
Government grants | (12,286) | (7,543) |
Structures [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 4,290,373 | 3,860,523 | 3,081,524
Structures [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 9,030,274 | 8,292,323 |
Structures [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (4,739,870) | (4,431,766) |
Government grants | (31) | (34) |
Machinery and equipment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 18,205,327 | 18,311,678 | 16,539,192
Machinery and equipment [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 60,640,317 | 58,845,673 |
Machinery and equipment [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (42,410,343) | (40,516,816) |
Government grants | (24,647) | (17,179) |
Vehicles [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 100,615 | 89,975 | 79,595
Vehicles [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 502,658 | 433,218 |
Vehicles [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (400,506) | (340,993) |
Government grants | (1,537) | (2,250) |
Tools [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 118,257 | 134,501 | 128,865
Tools [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 623,466 | 609,799 |
Tools [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (504,974) | (474,877) |
Government grants | (235) | (421) |
Furniture and fixtures [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 219,168 | 200,033 | 189,887
Furniture and fixtures [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 993,990 | 911,525 |
Furniture and fixtures [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (774,780) | (711,472) |
Government grants | (42) | (20) |
Bearer plants [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 362,871 | 139,451 | 137,331
Bearer plants [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 588,892 | 203,433 |
Bearer plants [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (226,021) | (63,982) |
Construction-in-progress [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 8,141,656 | 7,523,190 | 6,333,673
Construction-in-progress [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 8,399,751 | 7,744,779 |
Construction-in-progress [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | (207,727) | (180,824) |
Government grants | (50,368) | (40,765) |
Right-of-use assets [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 1,374,327 | 970,634 | ₩ 998,305
Right-of-use assets [member] | Gross amount [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | 2,071,107 | 1,589,388 |
Right-of-use assets [member] | Accumulated depreciation, amortization and impairment [member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment | ₩ (696,780) | ₩ (618,754) |

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