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Investment Property, Net - Additional Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of detailed information about investment property [line items]
Investment property	₩ 1,691,625	₩ 1,955,896	₩ 1,616,294
Fair value [member] | 6 Subsidiaries, including POSCO(Dalian) IT Center Development Co.,Ltd [member]
Disclosure of detailed information about investment property [line items]
Investment property	₩ 2,605,968

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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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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