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Other Operating Income and Expenses - Details of Other Operating Income and Expenses (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Detailed Information About Other Operating Income And Expenses [Line Items]      
Gain on bargain purchase ₩ 0 ₩ 0 ₩ 41,072
QSONE Co.Ltd [member]      
Disclosure Of Detailed Information About Other Operating Income And Expenses [Line Items]      
Gain on disposal of investment in associates     184,556
Non-current assets held for sale [member] | CSP-Compania Siderurgica do Pecem [member]      
Disclosure Of Detailed Information About Other Operating Income And Expenses [Line Items]      
Gain (loss) on disposals of assets held for sale     102,470
Gain (loss) on disposal of assets held for sale recognized as profit or loss     ₩ 103,366