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Selling and Administrative Expenses - Summary of Selling Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of comprehensive income [Line Items]      
Freight and custody ₩ 2,444,069 ₩ 2,594,589 ₩ 2,297,544
Sales commissions 94,092 102,114 68,138
Total Selling expenses 244,175 234,888 233,579
Selling expenses [member]      
Statement of comprehensive income [Line Items]      
Freight and custody 31,038 34,554 55,531
Operating expenses for distribution center 618 1,995 4,534
Sales commissions 94,092 102,114 68,138
Sales advertising 1,632 4,304 4,083
Sales promotion 10,729 9,887 9,503
Sample 2,181 2,436 2,234
Sales insurance premium 34,606 32,139 31,622
Contract cost 52,808 35,124 46,140
Others 16,471 12,335 11,794
Total Selling expenses ₩ 244,175 ₩ 234,888 ₩ 233,579