XML 246 R236.htm IDEA: XBRL DOCUMENT v3.26.1

Commitments and Contingencies - Litigations in Progress (Parenthetical) (Detail)	12 Months Ended
	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

X

- 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

X

- Details

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