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Revenue - Contract - Summary of provision of construction loss explanatory (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure Of Provision Of Construction Loss Explanatory [Line Items] |  |
Provision for construction loss | ₩ 114,306 | ₩ 53,349
Infrastructure-Construction segment [Member] |  |
Disclosure Of Provision Of Construction Loss Explanatory [Line Items] |  |
Provision for construction loss | 113,391 | 52,492
Other Segment [Member] |  |
Disclosure Of Provision Of Construction Loss Explanatory [Line Items] |  |
Provision for construction loss | ₩ 915 | ₩ 857

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