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Business combinations (Details) - HIEP HIEP THANH INVESTMENT COMPANY LIMITED [Member] - KRW (₩) ₩ in Millions | 2 Months Ended | 12 Months Ended |
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Dec. 31, 2025 | Dec. 31, 2025 | Oct. 20, 2025
Disclosure of detailed information about business combination [line items] |  |  |
Percentage of voting equity interests acquired |  |  | 100.00%
Revenue of acquiree since acquisition date | ₩ 2,796 |  |
Profit (loss) of acquiree since acquisition date | ₩ 1,056 |  |
Revenue of combined entity as if combination occurred at beginning of period |  | ₩ 11,853 |
Profit (loss) of combined entity as if combination occurred at beginning of period |  | 17,933 |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  | ₩ 171 |
Reclassification of investment property to property plant and equipment |  |  | ₩ 188,029

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