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Commitments and Contingencies - Litigations in Progress (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2025 Lawsuits
Lawsuits provision [member] |
Disclosure of contingent liabilities [line items] |
Estimated lawsuits | 38

X
- 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 Number of lawsuits filed. + References No definition available. + Details
Name: | pkx_NumberOfLawsuitsFiled
Namespace Prefix: | pkx_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=pkx_LawsuitsProvisionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |