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Operating segments - Financial information of geographical area (Parenthetical) (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of geographical areas [line items] |  |  |
Operating income | ₩ 7,023,357 | ₩ 6,458,670 | ₩ 6,100,850
Vietnam |  |  |
Disclosure of geographical areas [line items] |  |  |
Operating income | 332,114 | 332,717 | 275,581
Japan |  |  |
Disclosure of geographical areas [line items] |  |  |
Operating income | ₩ 256,027 | ₩ 218,393 | ₩ 187,466

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