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Expenses by Nature - Summary of Expenses by Nature (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
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