v3.26.1
Inventories - Details of Inventories (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of inventories [Line Items]    
Merchandise ₩ 154,054 ₩ 183,202
Supplies 13,586 26,581
Inventories 167,640 209,783
Gross amount [member]    
Disclosure of inventories [Line Items]    
Merchandise 160,996 191,323
Supplies 13,586 26,581
Inventories 174,582 217,904
Accumulated impairment [member]    
Disclosure of inventories [Line Items]    
Merchandise (6,942) (8,121)
Supplies 0 0
Inventories ₩ (6,942) ₩ (8,121)