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Property, Plant and Equipment, Net - Property, Plant and Equipment and Investment Property Pledged as Collateral (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment and investment property pledged as collateral ₩ 5,010,069 ₩ 4,012,215
Land [member] | Korean Development Bank and others [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment and investment property pledged as collateral 765,038 846,211
Buildings and structures [member] | Korean Development Bank and others [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment and investment property pledged as collateral 1,275,029 1,303,216
Machinery and equipment [member] | Korean Development Bank and others [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment and investment property pledged as collateral 2,319,098 1,828,174
Other property, plant and equipment [member] | Korean Development Bank and others [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment and investment property pledged as collateral ₩ 650,904 ₩ 34,614