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Operating segments - Financial information of geographical area (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Financial information of geographical area [Line Items] |  |  |
Operating income | ₩ 7,023,357 | ₩ 6,458,670 | ₩ 6,100,850
Non-current assets | 10,657,964 | 10,605,421 |
Domestic |  |  |
Financial information of geographical area [Line Items] |  |  |
Operating income | 5,642,133 | 5,180,020 | 5,088,487
Non-current assets | 9,797,256 | 10,185,952 |
Overseas |  |  |
Financial information of geographical area [Line Items] |  |  |
Operating income | 1,381,224 | 1,278,650 | ₩ 1,012,363
Non-current assets | ₩ 860,708 | ₩ 419,469 |

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