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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
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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

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