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Investments in Associates and Joint Ventures - Details of Investments in Associates (Parenthetical) (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of associates [line items] |  |
Investment in associates provided as collateral for borrowings | ₩ 486,995 | ₩ 452,614

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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. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Investments in associates provided as collateral for borrowings. + References No definition available. + Details
Name: | pkx_InvestmentsInAssociatesProvidedAsCollateralForBorrowings
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant