XML 160 R150.htm IDEA: XBRL DOCUMENT
v3.26.1

Employee Benefits - Summary of amount recognizedi n relation to net defined benefit asset liabilities in statement of financial position explanatory (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Disclosure of defined benefit plans [abstract] |  |
Present value of funded obligations | ₩ 2,631,811 | ₩ 2,589,246
Fair value of plan assets | (2,923,780) | (2,962,342)
Present value of non-funded obligations | (4,954) | 7,092
Net defined benefit assets | ₩ (296,923) | ₩ (366,004)

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfDefinedBenefitPlansAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_57_a&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_PlanAssetsAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_RecognisedLiabilitiesDefinedBenefitPlan
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Funded defined benefit obligation at present value. + References No definition available. + Details
Name: | pkx_FundedDefinedBenefitObligationAtPresentValue
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unfunded defined benefit obligation at present value. + References No definition available. + Details
Name: | pkx_UnfundedDefinedBenefitObligationAtPresentValue
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant