v3.26.1
Financial Risk Management - Additional Information (Detail) - KRW (₩)
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [Line items]    
Long-term borrowings ₩ 503,125,000,000 ₩ 515,600,000,000
Bonds 8,213,904,000,000 [1] 8,511,280,000,000
Maximum credit exposure 4,942,367,000,000 5,749,215,000,000
Amounts payable, related party transactions 240,565,000,000  
Floating-rate [member]    
Disclosure of detailed information about financial instruments [Line items]    
Long-term borrowings 200,000,000,000  
Bonds 430,470,000,000  
Face value of floating rate long term payables others ₩ 551,925,000,000  
Interest rate risk [member] | Long-term payables - other [member]    
Disclosure of detailed information about financial instruments [Line items]    
Hypothetical increase (decrease) in interest rate 1.00%  
Financial instruments [member]    
Disclosure of detailed information about financial instruments [Line items]    
Maximum credit exposure ₩ 151,796,000,000 324,263,000,000
Loans and receivables [member]    
Disclosure of detailed information about financial instruments [Line items]    
Maximum credit exposure 872,412,000,000 920,977,000,000
Cash and cash equivalents [Member]    
Disclosure of detailed information about financial instruments [Line items]    
Maximum credit exposure 1,489,850,000,000 2,023,543,000,000
Long-term investment securities [member]    
Disclosure of detailed information about financial instruments [Line items]    
Maximum credit exposure ₩ 2,651,000,000 ₩ 2,205,000,000
[1] The contractual cash flow is amount that includes interest payables