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Commitments and Contingencies - Summary of Conditional Debt Assumption and Principal and Interest Repayment Contingencies (Parenthetical) (Detail) ₩ in Millions	Dec. 31, 2025 KRW (₩)
Debt repayment contingencies [member] | Maintenance projects [member]
Disclosure of contingent liabilities [line items]
Debt assumption upon loan origination amounts	₩ 28,305

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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_DebtRepaymentContingenciesMember
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: