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Other Liabilities - Summary of Other Liabilities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Senex Energy Limited [Member] |  |
Other Liabilities [Line Items] |  |
Business combination liabilities assumed | ₩ 43,850 | ₩ 41,770

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- Definition Business combination liabilities assumed. + References No definition available. + Details
Name: | pkx_BusinessCombinationLiabilitiesAssumed
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other liabilities. + References No definition available. + Details
Name: | pkx_OtherLiabilitiesLineItems
Namespace Prefix: | pkx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BusinessCombinationsAxis=pkx_SenexEnergyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |