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Research and Development Expenditures Recognized as Expenses - Summary of Research and Development Expenditures Recognized as Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of comprehensive income [Line Items]      
Research and development expenditures recognized as expenses ₩ 527,179 ₩ 555,560 ₩ 518,409
Administrative expenses [member]      
Statement of comprehensive income [Line Items]      
Research and development expenditures recognized as expenses 195,255 207,557 175,167
Cost Of Sale [Member]      
Statement of comprehensive income [Line Items]      
Research and development expenditures recognized as expenses ₩ 331,924 ₩ 348,003 ₩ 343,242