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Commitments and Contingencies - Summary of Contingencies of Claim for Damages in the Event of Non-Compliance of Responsibility Completion (Parenthetical) (Detail) ₩ in Millions | Dec. 31, 2025 KRW (₩)
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Contingencies of claim for damages [member] | Maintenance projects [member] |
Disclosure of contingent liabilities [line items] |
Debt assumption upon loan origination amounts | ₩ 385,000

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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
Name: | ifrs-full_DisclosureOfContingentLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt assumption upon loan origination amounts. + References No definition available. + Details
Name: | pkx_DebtAssumptionUponLoanOriginationAmounts
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=pkx_ContingenciesOfClaimForDamagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | pkx_ContingentLiabilitiesProjectAxis=pkx_MaintenanceProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |