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Property, Plant and Equipment, Net - Summary of Lease Expense Recognised in the Income Statement (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
TextBlock 1 [Abstract]      
Interest on lease liabilities ₩ 63,586 ₩ 48,887 ₩ 41,109
Expenses related to short-term leases 38,639 53,944 52,486
Expenses related to leases of low-value assets 19,346 25,968 20,103
Total ₩ 121,571 ₩ 128,799 ₩ 113,698