XML 173 R163.htm IDEA: XBRL DOCUMENT v3.26.1

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

X

- 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

X

- Definition

Other liabilities.

+ References

No definition available.

+ Details

Name:	pkx_OtherLiabilitiesLineItems
Namespace Prefix:	pkx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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