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Other Receivables - Summary of lease investment and net lease investment (Detail) - Other receivables [member] - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Leases By Lessor [Line Items]    
Undiscounted lease payments ₩ 107,861 ₩ 129,231
Unrealized interest income (27,753) (34,327)
Present value of minimum lease payment 80,108 94,904
Less than 1 year [member]    
Disclosure Of Leases By Lessor [Line Items]    
Gross amount of lease payment 15,298 19,051
1 year - 3 years [member]    
Disclosure Of Leases By Lessor [Line Items]    
Gross amount of lease payment 23,072 31,805
3 years – 5 years [member]    
Disclosure Of Leases By Lessor [Line Items]    
Gross amount of lease payment 14,067 9,848
Over 5 years [member]    
Disclosure Of Leases By Lessor [Line Items]    
Gross amount of lease payment ₩ 55,424 ₩ 68,527