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Share-based payments - Summary of share-based compensation costs (Details) - Performance shares - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Share-based compensation costs [Line Items] |  |  |
Employees of the controlling company | ₩ 10,979 | ₩ 4,950 | ₩ 5,123
Employees of the subsidiaries | 95,163 | 41,686 | 36,751
Total | ₩ 106,142 | ₩ 46,636 | ₩ 41,874

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