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Expenses by Nature - Summary of Expenses by Nature (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Analysis of income and expense [abstract] |  |  |
Raw material used, changes in inventories and others | ₩ 40,850,761 | ₩ 42,857,995 | ₩ 46,179,074
Employee benefits | 5,231,514 | 5,075,621 | 4,660,771
Outsourced processing cost | 8,464,877 | 10,333,545 | 10,377,087
Electricity and water expenses | 1,275,012 | 1,200,587 | 1,099,970
Depreciation | 3,693,288 | 3,530,770 | 3,325,088
Amortization | 465,935 | 453,689 | 498,193
Freight and custody expenses | 2,444,069 | 2,594,589 | 2,297,544
Sales commissions | 94,092 | 102,114 | 68,138
Loss on disposal of property, plant and equipment | 89,883 | 85,149 | 125,823
Impairment loss on property, plant and equipment | 135,653 | 608,122 | 275,846
Impairment loss on intangible assets | 51,640 | 47,993 | 129,907
Donations | 90,443 | 75,261 | 67,393
Others | 4,927,969 | 5,429,250 | 5,615,703
Expenses by nature | 67,815,136 | 72,394,685 | 74,720,537
Wages and salaries | 4,878,407 | 4,769,925 | 4,375,123
Expenses related to post-employment benefits | 353,107 | 305,696 | 285,648
Employee benefits expenses | ₩ 5,231,514 | ₩ 5,075,621 | ₩ 4,660,771

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