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Investment properties - Summary of investment properties (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investment properties, net [Line Items]
Investment properties	₩ 611,620	₩ 327,696	₩ 257,806
Acquisition cost
Investment properties, net [Line Items]
Investment properties	808,759	495,844
Accumulated depreciation
Investment properties, net [Line Items]
Investment properties	(196,398)	(168,148)
Accumulated impairment losses
Investment properties, net [Line Items]
Investment properties	₩ (741)	₩ 0

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The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.

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