XML 247 R237.htm IDEA: XBRL DOCUMENT v3.26.1

Commitments and Contingencies - Details of Other Major contingencies (Detail)	12 Months Ended
	Dec. 31, 2025
POSCO HOLDINGS INC. [member]
Disclosure of contingent liabilities [line items]
Description	POSCO HOLDINGS INC. has provided 3 blank checks to Korea Energy Agency as collateral for long-term foreign currency borrowings.
POSCO INTERNATIONAL Corporation [member]
Disclosure of contingent liabilities [line items]
Description	As of December 31, 2025, POSCO INTERNATIONAL Corporation has provided 19 blank promissory notes and 12 blank checks to Korea Energy Agency and others as collateral for the guarantee on performance for contracts and others.
POSCO Eco & Challenge Co., Ltd
Disclosure of contingent liabilities [line items]
Description	As of December 31, 2025, POSCO Eco & Challenge Co., Ltd. has provided 40 blank checks and 4 blank promissory notes as collateral for agreements and outstanding loans.
POSCO DX Co., Ltd.(formerly, POSCO ICT) [member]
Disclosure of contingent liabilities [line items]
Description	As of December 31, 2025, POSCO DX Co., Ltd. has provided 7 blank checks to financial institutions as collateral for the guarantee on performance for contracts and others.

X

- Definition

The description of the nature of the obligation for contingent liabilities. [Refer: Classes of contingent liabilities [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2025-01-01
-Paragraph 86
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_86&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 259
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_259&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 259
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_259&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_DescriptionOfNatureOfObligationContingentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_ParentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=pkx_PoscoInternationalCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=pkx_POSCOEcoAndChallengeCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=pkx_PoscoDxCo.Ltd.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: