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Revenue - Contract - Summary of Changes in Estimated Total Contract Costs and Impact on Profit or Loss (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Changes in total contract revenues | ₩ 1,198,301 | ₩ 1,346,547 | ₩ 1,362,828
Changes in estimated total contract costs | 1,242,208 | 1,578,811 | 1,419,726
Changes in profit before income taxes of construction contract |  |  |
- Current period | (410,413) | (314,409) | (91,397)
- Future periods | ₩ 366,506 | ₩ 82,145 | ₩ 34,499

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